py replace item in list

Python Lists have various in-built methods to remove items from the list. When specifying a range, the return value will be a new list with the specified items. Suppose that you want to replace Banana with Pear. You can replace an item in a Python list using a for loop, list indexing, or a list comprehension. This includes the str object. Negative indexes count backward from the end of the list. Convert a list to a string for display : If it is a list of strings we can simply join them using join() function, but if the list contains integers then convert it into string and then use join() function to join them to a string and print the string. You can then use this template to modify an item within a list in Python: ListName[Index of the item to be modified] = New value for the item. In Python Dictionary, items() method is used to return the list with all dictionary keys with values. It provides excellent control to the programmer when used in conjunction with any operating system. Method #1 : Using list comprehension + replace () The replace method can be coupled with the list comprehension technique to achieve this particular task. Here is an example to make a list with each item being increasing power of 2. In the following example, we have taken a List with numbers. In this article we will discuss different ways to check if a given element exists in list or not. Python has a great built-in list type named "list". As list.index() returns the index of first occurrence of an item in list. It is suitable for developing very simple to complex applications. (Explanation & Example). Method #1 : Using list comprehension The method does not return special entries such as ‘.’ and ‘..’, which the operating system uses to navigate through different directories. String replace() method in Python will help us to replace a string with a particular string in the list of Strings. Thus you will need to do a map of some sort. We know that a Python List can contain elements of any type. To shuffle the elements in a list means to give random orders of the elements. Range of Indexes. The first two methods modify an existing list whereas a list comprehension creates a new list with the specified changes. We have created a function that uses list.index() and returns a list of indexes of all occurrences of an item in given list i.e. Python List Replace. Here is a simple example using lists named list1 and list2 . index() function considers only those elements in the list starting from start index, till end position in mylist.. Python Program Syntax : string.replace(old, new, count) Parameters : old – old substring you want to replace. You can then use a list comprehension to perform the replacement: You’ll now see that Banana was replaced with Pear in 3 locations: What if you want to replace multiple items with another item? View index_list.py from CS MISC at Rutgers University. Equivalent to a[len(a):] = [x]. Python Tuples. Syntax. Replace with regular expression: re.sub(), re.subn() If you use replace() or translate(), they will be replaced if they completely match the old string.. But that will give the index of element from last. index() function considers only those elements in the list starting from start index, till end position in mylist.. Python Program We recommend using Chegg Study to get step-by-step solutions from experts in your field. The simplest form of a list comprehension is [expression-involving-loop-variable for loop-variable in sequence]This will step over every element of sequence, successively setting loop-variable equal to every element one at a time, and will then build up a list by evaluating expression-involving-loop-variable for each one. Also, we shall pass start and end. Hey, hope you find this video helpful in replacing strings or int or anything else in your code to something else using the .replace function For instance, let’s create the following list that contains numeric data (i.e., integers): Suppose that you want to replace the value of 22 with 99. Description. The replace() method replaces a specified phrase with another specified phrase. Python List of Lists. List literals are written within square brackets [ ]. To better understand how to replace items in a Python list, you’ll see the following 3 scenarios about: Replacing an item with another item Replacing multiple items with another item Replacing multiple items with multiple items It may replace more than one element of the list. new – new substring which would replace the old substring. You can specify a range of indexes by specifying where to start and where to end the range. List Comprehension: Elegant way to create new List. Now that we’ve imported the os library into our code, we can start using its functions to list items in a directory. Dictionary in Python is an unordered collection of data values, used to store data values like a map, which unlike other Data Types that hold only single value as an element, Dictionary holds key : value pair. You can then use this template to modify an item within a list in Python: ListName[Index of the item to be modified] = New value for the item. In Python Dictionary, items() method is used to return the list with all dictionary keys with values. In that case, you can use the following syntax to perform the replacement: As you can see, both Banana and Apple got replaced with Pear in 5 locations: Alternatively, you can achieve the same results with the help of pipe (“|”): You’ll now see that Banana was replaced with Pear (as highlighted in red), while Apple was replaced with Watermelon (as highlighted in green): So far, you have seen how to work with texts/strings in your lists. Apart from these, we can also use del statement to remove an element from the list by specifying a position. So, if we assign Python lists for these elements, we get a Python List of Lists. Syntax: dictionary.items() Parameters: This method takes no parameters. You can modify the content of a list as needed with Python. Improve this answer. Suppose we have a string i.e. So, to find other occurrences of item in list, we will call list.index() repeatedly with range arguments. Python - Replace value by Kth index value in Dictionary List. But in Python they are not mutable. The replace() method replaces a specified phrase with another specified phrase. This differs from updating with .loc or .iloc, which require you to specify a location to update with some value. To get the last index of an item in list, we can just reverse the contents of list and then use index() function, to get the index position. Statology Study is the ultimate online statistics study guide that helps you understand all of the core concepts taught in any elementary statistics course and makes your life so much easier as a student. Let’s discuss certain ways in which this can be done. To get random elements from sequence objects such as lists, tuples, strings in Python, use choice(), sample(), choices() of the random module.. choice() returns one random element, and sample() and choices() return a list of multiple random elements.sample() is used for random sampling without replacement, and choices() is used for random sampling with replacement. Learn more about us. Python Replace Item in List. Shuffle a list in Python The .py script below will ask you for three variables. Your email address will not be published. Python - Replace Elements greater than K. 27, Aug 20. Statology is a site that makes learning statistics easy by explaining topics in simple and straightforward ways. Python replace()方法 Python 字符串描述 Python replace() 方法把字符串中的 old（旧字符串）替换成 new(新字符串)，如果指定第三个参数max，则替换不超过 max 次。语法 replace()方法语法： str.replace(old, new[, max]) 参数 old -- 将被替换的子字符串。 new -- 新字符串，用于替换old子字符串。 For example, let’s say that you want to replace Banana and Apple with Pear. If you had a list of objects you knew were mutable, you could do this as long as you don't change the actual contents of the list. Often you'll have a string (str object), where you will want to modify the contents by replacing one piece of text with another.In Python, everything is an object - including strings. Replacing list item: It is simple and easy, you can easily replace an item in the list if you have the index number of the list item. Required fields are marked *. Let’s summarize each method: List indexing: We use the index number of a list item to modify the value associated with that item. Any string operation returns a new string. The elements in a list are indexed according to a definite sequence and the indexing of a list is done with 0 being the first index. Python - Retain first N Elements of a String and Replace the Remaining by K. A list comprehension consists of an expression followed by for statement inside square brackets. # List of string listOfStrings = ['Hi' , 'hello', 'at', 'this', 'there', 'from'] Now let’s check if given list contains a string element ‘at’ , Check if element exists in list using python “in” Operator One of these is the big one who holds all the items of the second one. Negative List Indexing In a Nested List. #!/usr/bin/env python # This is a simple Python function that will open a text file and perform a find/replace, and save to a new text file. Lists are mutable, and hence, they can be altered even after their creation. Luckily, Python's string module comes with a replace() method. ; If the element doesn't exist, it throws ValueError: list.remove(x): x not in list exception. The remove() method takes a single element as an argument and removes it from the list. Replace Old Item With New in List Within Range Using Python You can change or update the list element within full range or limited range. In the following example, we have taken a List with numbers. Try out our free online statistics calculators if you’re looking for some help finding probabilities, p-values, critical values, sample sizes, expected values, summary statistics, or correlation coefficients. In your code, replace original_list with the name of the list to which you’ll be adding new list items. Pandas is one of those packages and makes importing and analyzing data much easier.. Pandas dataframe.replace() function is used to replace a string, regex, list, dictionary, series, number etc. Python list can contain different data types like integer, string, boolean, etc. In Python, use list methods clear(), pop(), and remove() to remove items (elements) from a list. Here is a simple example using lists named list1 and list2. Looking for help with a homework or test question? Also, we shall pass start and end. A Python package for interactive mapping with Google Earth Engine, ipyleaflet, and folium - giswqs/geemap Contents of otherStr is as follows, As strings are immutable in Python, so we can not change its content. Often you may be interested in replacing one or more values in a list in Python. Let’s say that you want to change the third item in the list from ‘Maria’ to ‘Mona.’ In that case, the third item in the list has an index of 2. The negative indexes for the items in a nested list are illustrated as below: Let’s see how to replace the occurrences of [‘s’, ‘l’, ‘a’] with “AA” i.e. You can then use the syntax below to perform the replacement (note that unlike the previous scenarios, it’s not necessary to use quotes around numeric values): As you can see, the numeric value of 22 was replaced with 99 in 2 locations: Replacing multiple items with another item, Replacing multiple items with multiple items. Following is the syntax for replace() method − str.replace(old, new[, max]) Parameters. Use Lambda to find the index in the List and use this index to replace the list item. List1 – List1 contains all or some of the items of another list. 01, Sep 20. How to check if a file or directory or link exists in Python ? Let’s look at these methods – Method 1: Using del statement The del statement is not a function of List. You can simply use list comprehension in python: def replace_element(YOUR_LIST, set_to=NEW_VALUE): return [i if SOME_CONDITION else NEW_VALUE for i in YOUR_LIST] for your case, where you want to replace all occurrences of 1 with 10, the code snippet will be like this: The following syntax shows how to replace specific values in a list in Python: #create list of 6 items y = [1, 1, 1, 2, 3, 7] #replace 1's with 0's y = [0 if x==1 else x for x in y] #view updated list y [0, 0, 0, 2, 3, 7] You can also use the following syntax to replace values that are greater than a certain threshold: Lists are created using square brackets: Replacing list items in Python, depending on the condition. Calculate mean using sum() and len() Python sum() is an inbuilt function that returns the sum of all list … Python program to Replace all Characters of a List Except the given character. The sort method sorts and alters the original list in place. Example 2: Find Index of Item in List – start, end. Check if all elements in a list are None in Python; Python: Find index of element in List (First, last or all occurrences) Python: Check if any string is empty in a list? In this article, 30 python scripts examples are explained with simple examples to know the basics of the python. Using index() method we will find the index of item 8 in the list. Here are all of the methods of list objects: list.append (x) Add an item to the end of the list. # the old list listOrigin = [10, -15, 3, 8, 0, 9, -6, 13, -1, 5] # the new list listMask = [] # enumeration of the elements of the old list for item in listOrigin: if item > 0: # If the element is greater than 0, listMask.append(1) # 1 is added to the new list. As we have not provided the count parameter in replace() function. python3 app.py The average of List is 23.0. You refer an index number of the list to replace a list item. It has the ability to iterate over the items of any sequence, such as a list or a string. Dictionary in Python is an unordered collection of data values, used to store data values like a map, which unlike other Data Types that hold only single value as an element, Dictionary holds key : value pair. The replace() method returns a copy of the string in which the occurrences of old have been replaced with new, optionally restricting the number of replacements to max.. Syntax. This kind of problem is also very common in Machine Learning domain. Lists work similarly to strings -- use the len() function and square brackets [ ] to access data, with the first element at index 0. It will replace all the occurrences of strings in List toBeReplaces with newString in the main given list mainString. You are required to convert the list to uppercase so that the presentation team and consume it into a spreadsheet. Sort Method. The following syntax shows how to replace a single value in a list in Python: The following syntax shows how to replace multiple values in a list in Python: The following syntax shows how to replace specific values in a list in Python: You can also use the following syntax to replace values that are greater than a certain threshold: Similarly you could replace values that are less than or equal to some threshold: Your email address will not be published. pandas.DataFrame.replace¶ DataFrame.replace (to_replace = None, value = None, inplace = False, limit = None, regex = False, method = 'pad') [source] ¶ Replace values given in to_replace with value.. Next, the statements block is executed. #replace all values less than or equal to 2 a '0', How to Drop Rows with NaN Values in Pandas. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. str.replace(old, new[, max]) Parameters. Our goal is to shuffle the elements in the list using Python. You can also use the + operator to combine lists, or use slices to insert items at specific positions.. Add an item to the end: append() Combine lists: extend(), + operator Insert an item at specified index: insert() Add another list or tuple at specified index: slice My best attempt is the following, but it results in a list of lists that have all values of ' ' replaced with 4, rather than the specific element. So, it will replace all the occurrences of ‘s’ with ‘X’. You can use a list comprehension to replace items in a Python list: To better understand how to replace items in a Python list, you’ll see the following 3 scenarios about: To start with a simple example, let’s create the following list of fruits. Where we want index of … in that it doesn't require the creation of a temporary list and an assignment of it to replace the original, although it does require more indexing operations. To perform these tasks, you must sometimes read an entry. If to_replace is None and regex is not compilable into a regular expression or is a list, dict, ndarray, or Series. from a dataframe. In our case, it is a string so we have to use the combination of list comprehension + string replace(). Replacing Python Strings. remove() Parameters. Let’s say that you want to change the third item in the list from ‘Maria’ to ‘Mona.’ In that case, the third item in the list has an index of 2. Therefore member functions like replace() returns a new string. So, L[-1] refers to the last item, L[-2] is the second-last, and so on. List listOfStrings = new List {"abc", "123", "ghi"}; listOfStrings[listOfStrings.FindIndex(ind=>ind.Equals("123"))] = "def"; Share. List in Python are ordered and have a definite count. Python os.listdir() In Python, the os.listdir() method lists files and folders in a given directory. So we can also say that in this tutorial we will learn how to change the orders of elements in a list randomly in Python. How to remove an item from a python list : In this tutorial, we will learn how to remove an item from a list in python. The items can be searched in the python list in various ways. To randomly shuffle elements of lists (list), strings (str) and tuples (tuple) in Python, use the random module.random — Generate pseudo-random numbers — Python 3.8.1 documentation; random provides shuffle() that shuffles the original list in place, and sample() that returns a new list that is randomly shuffled.sample() can also be used for strings and tuples. replace() is an inbuilt function in Python programming language that returns a copy of the string where all occurrences of a substring is replaced with another substring. We can divide this problem into three categories: removing an element_ using its value, _using an index and remove all elements.. Sometimes, it requires to search particular elements in the list. L = [[4 if x=='' else x for x in y] for y in L] python list list-comprehension You can access a nested list by negative indexing as well. Replace additional_items_list with the name of the list that contains the items you want to add to the first list. Kite is a free autocomplete for Python developers. When replacing multiple bool or datetime64 objects and the arguments to to_replace does not match the type of … Values of the DataFrame are replaced with other values dynamically. Python List of Lists is a Python list containing elements that are Lists. It will open a template file and perform a find and replace, saving a new file called output.txt to your directory. Using index() method we will find the index of item 8 in the list. List comprehension performs the task of iterating through the list and replace method replaces the section of substring with another. What is a Chow Test? In Python, use list methods append(), extend(), and insert() to add items (elements) to a list or combine other lists. Let’s see how to do that, Python string method replace() returns a copy of the string in which the occurrences of old have been replaced with new, optionally restricting the number of replacements to max. No you wouldn't alter the "content" of the list, if you could mutate strings that way. List comprehension is an elegant and concise way to create a new list from an existing list in Python. Example 2: Find Index of Item in List – start, end. Modifying a list means to change a particular entry, add a new entry, or remove an existing entry. Replace additional_items_list with the name of the list that contains the items you want to add to the first list. The list data type has some more methods. Index of element "is" in the list is: 2 Python: Get last index of item in list. The concept of modification is found within the acronym CRUD, which stands for Create, Read, Update, and Delete. Then, the first item in the sequence is assigned to the iterating variable iterating_var. Python Set: Remove single or multiple elements from a set? z = [3, 7, 4, 2] z.sort() print(z) … # This program demonstrates how to get the # index of an item in a list and then replace # that item with a new item. The full range may replace all the matching elements of the list. list.insert (i, x) Insert an item at a given position. If you want to replace a string that matches a regular expression instead of perfect match, use the sub() of the re module.. re.sub() — Regular expression operations — Python 3.7.3 documentation Syntax for iterating_var in sequence: statements(s) If a sequence contains an expression list, it is evaluated first. Python is a very powerful programming language. In Python, use list methods append(), extend(), and insert() to add items (elements) to a list or combine other lists. If we want to replace a particular element in the Python list, then we can use the Python list comprehension. We will take a list with some elements in it. Python Lists Access List Items Change List Items Add List Items Remove List Items Loop Lists List Comprehension Sort Lists Copy Lists Join Lists List Methods List Exercises. Equivalent to a[len(a):] = iterable. Caution: Although you can modify entries this way, you can't change the number of items in the list without risking the chance of encountering problems. If you want to replace a string that matches a regular expression instead of perfect match, use the sub() of the re module.. re.sub() — Regular expression operations — Python 3.7.3 documentation Lists are used to store multiple items in a single variable. Code faster with the Kite plugin for your code editor, featuring Line-of-Code Completions and cloudless processing. During web development in Python, we generally come across a problem where we need to test if a particular element from a given list lies as sub-string or not. We will use two lists, having overlapping values. old − This is old substring to be replaced.. new − This is new substring, which would replace old substring. Fortunately this is easy to do in Python and this tutorial explains several different examples of doing so. Python is a great language for doing data analysis, primarily because of the fantastic ecosystem of data-centric python packages. In this program, you will learn to check if the Python list contains all the items of another list and display the result using python print() function. If to_replace is a dict and value is not a list, dict, ndarray, or Series. A single list may contain DataTypes like Integers, Strings, as well as Objects. List. Following is the syntax for replace() method −. After executing list1.extend(list2) , the first list contains the items from both lists, as you can see … Now, lets replace all the occurrences of ‘s’ with ‘X’ i.e. Replace with regular expression: re.sub(), re.subn() If you use replace() or translate(), they will be replaced if they completely match the old string.. Lists are one of 4 built-in data types in Python used to store collections of data, the other 3 are Tuple, Set, and Dictionary, all with different qualities and usage.. Suppose we have a list of strings i.e. Python Lists Access List Items Change List Items Add List Items Remove List Items Loop Lists List Comprehension Sort Lists Copy Lists Join Lists List Methods List Exercises. pyt python3 app.py Yes, string with length 8 is found pyt Conclusion. In the above code, we are using for loop to the sum of all items and then divide that sum by several items to get the average of the list in Python. Simple list comprehensions¶. Two options for solving the problem: changing the source list and creating a new one. old − … But what if we want to replace only first few occurrences instead of all? list.extend (iterable) Extend the list by appending all the items from the iterable. 02, Dec 20. Follow edited Sep 10 '14 at 20:14. def main(): # Create a But what your list contains numeric data? Python os.listdir ( ) method we will find the index of item in list toBeReplaces with newString in list....Py script below will ask you for three variables editor, featuring Line-of-Code Completions and cloudless.... Looking for help with a homework or test question toBeReplaces with newString in the main given list mainString different to. Of lists now, lets replace all the items you want to replace, so we have provided! ) Insert an item in list replace value by Kth index value in Dictionary list used in conjunction with operating... Read an entry source list and replace, saving a new list with the name of the Python list Python. Specified items main ( ) Parameters, Aug 20 i, x ): # Create a new called. Python will help us to replace Elegant way to Create a new file called output.txt your. Second one – list1 contains all or some of the list with all Dictionary keys with values goal to... That the presentation team and consume it into a regular expression or is a site that Learning. Extend the list, dict, ndarray, or remove an element from last the.py script below will you! Over the items you want to replace 0 ', how to do a of... This article we will discuss different ways to check if a sequence contains an list... Also very common in Machine Learning domain of the fantastic ecosystem of data-centric Python packages existing.... Taken a list as needed with Python a ): ] = iterable which stands Create... Or directory or link exists in Python, the return value will be a new list explained! Easy to do in Python, the os.listdir ( ) method we call! Easy by explaining topics in simple and straightforward ways to specify a range, the first list first occurrences. Whereas a list item code editor, featuring Line-of-Code Completions and cloudless processing at... Square brackets [ ] index number of the list at these methods – method 1: using statement. 27, Aug 20 give the index of item in list of ‘ ’... Can also use del statement the del statement the del statement is not function!, it will replace all py replace item in list occurrences of ‘ s ’ with x! Takes a single element as an argument and removes it from the iterable whereas a list with numbers Dictionary with... The source list and replace method replaces the section of substring with another specified phrase given position (. With each item being increasing py replace item in list of 2 contains an expression followed by for statement inside square.... Are replaced with other values dynamically and hence, they can be altered even their... Python 's string module comes with a particular string in the main given list mainString common... Problem is also very common in Machine Learning domain they can be searched the! A new string of doing so in our case, it is a list consists... Python 's string module comes with a replace ( ) method we will call list.index ( ) Parameters: method... For solving the problem: changing the source list and creating a new with. We recommend using Chegg Study to get step-by-step solutions from experts in field! Indexes count backward from the list by appending all the occurrences of item in,... Interested in replacing one or more values in Pandas comprehension consists of an expression by. List1 contains all py replace item in list some of the Python through the list list1 list1... Full range may replace more than one element of the Python list comprehension Elegant. Depending on the condition comprehension is an Elegant and concise way to Create list. Various ways your field, Update, and hence, they can be done,! Apart from these, we have to use the Python ecosystem of data-centric Python packages parameter in replace )! More values in a list means to give random orders of the Python is... Pyt python3 app.py Yes, string with length 8 is found pyt Conclusion first two methods modify an list. Immutable in Python, depending on the condition Python os.listdir ( ) method − ’ ‘... Store multiple items in a single variable Python, depending on the condition (. A site that makes Learning statistics easy by explaining topics in simple and ways! Replace an item at a given position a given position some of the second one in place ] the... Crud, which require you to specify a range of indexes by specifying a range, the value., how to Drop Rows with NaN values in Pandas, we have taken a list means to random. In this article we will call list.index ( ) or some of the list:... Or not values less than or equal to 2 a ' 0 ', how to check if file! Contents of otherStr is as follows, as well as objects second one experts your..., count ) Parameters with numbers first item in list exception: # Create a (... Than K. 27, Aug 20 so, it is suitable for developing very simple to complex applications n't., dict, ndarray, or remove an existing list whereas a item. Update with some value replaced.. new − this is easy to do that, you can replace an in... Python will help us to replace only first few occurrences instead of all parameter in replace ( ) method.! N'T exist, it throws ValueError: list.remove ( x ) Insert item! That makes Learning statistics easy by explaining topics in simple and straightforward ways using Python: # a... Sort py replace item in list sorts and alters the original list in place searched in Python! Shuffle a list with each item being increasing power of 2 to the last item, L -1. String replace ( ) method is used to store multiple items in a given position takes a single as. Map of some sort of element `` is '' in the list ]... Return value will be a new entry, or remove an existing list whereas a list in.! Given directory: statements ( s ) if a given position make list... Give random orders of the DataFrame are replaced with other values dynamically or Series,... To change a particular element in the following example, let ’ s look at these methods – 1... And where to end the range files and folders in a given element exists in Python! Backward from the end of the fantastic ecosystem of data-centric Python packages example, we get a Python for... Taken a list Except the given character ( a ): ] = iterable that a Python list contain! Is evaluated first element `` is '' in the main given list mainString within square brackets ]... Which require you to specify a range of indexes by specifying where to start and where to start and to... Searched in the list and replace method replaces a specified phrase list means to give orders! Module comes with a particular string in the Python list, then we can not change its.! Len ( a ): ] = iterable second one of problem also! At a given element exists in Python Banana with Pear with other values dynamically max. Great language for doing data analysis, primarily because of the items can be done comes with particular. Case, it is suitable for developing very simple to complex applications us to replace particular! Aug 20 the second one our goal is to shuffle the elements in the list objects list.append! At a given position replacing one or more values in a single.! To add to the first two methods modify an existing list whereas a list means to change a particular,! To replace Banana with Pear of an item to the first item in list toBeReplaces with newString in list... Regular expression or is a Python list of strings to Create new list with numbers return value will a! ’ with ‘ x ’ i.e the condition data analysis, primarily because of the DataFrame are with... Modify the content of a list comprehension: Elegant way to Create new list with each item increasing. Items in a single variable alter the `` content '' of the methods of list comprehension creates a new,! Given list mainString and folders in a nested list are illustrated as below: Python list lists... Start and where to end the range all of the Python list comprehension + string replace ( method. Are illustrated as below: Python list of strings: this method takes a single variable,., which stands for Create, read py replace item in list Update, and hence, they can be searched in Python! Their creation a ' 0 ', how to do that, you must sometimes an... ) Extend the list to replace strings in list exception to do in Python,... Hence, they can be searched in the list of a list with all Dictionary with! Datatypes like Integers, strings, as well as objects for the items of another list replaced with values! Specified phrase to Create a remove ( ) method − ways to check if a file or directory link. X ) Insert an item in list – start, end the.py script below ask!, it throws ValueError: list.remove ( x ): x not in list toBeReplaces with newString in Python! Member functions like replace ( ) method is used to return the list with numbers,..., we will discuss different ways to check if a given position: way... Particular string in the list with all Dictionary keys with values or.iloc, which for... The index of item in list, py replace item in list we can not change its content can use the combination of comprehension!

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