![]() ![]() In this article, we will discuss different ways to convert a string to a list in Python. Sometimes, while manipulating strings, we need to convert a string to a list. extend, which functions mutate and which return new values, and so on. JStrings and lists are the most used python objects. In fact, one of the many reasons for that is that you don't have to remember append vs. However, as many people have pointed out, it's almost always better to use a list comprehension than to try to build the list with an explicit loop. The join () function combines the elements of a list using a string separator. To split a string s, the easiest way is to pass it to list (). It initializes an empty array to store the characters. And as we can observe, typecasting the string using the list () method gives us a list of the member characters, as required. This method uses extend() to convert string to a character array. (And even if you do need i for other purposes, you can loop over enumerate(first_list).) Python comes with an inbuilt function JOIN(), to convert a list into a string. Understanding the code: Firstly here, we initialize a string, string1 as AskPython and print its type using the type () method. It's a bit silly to loop over range(len(first_list)) if all you want with the index i is first_list you can just loop over first_list directly. Or use a function that doesn't modify the list in-place, but instead returns a new one: for i in range (len(first_list)): Just do this: for i in range (len(first_list)): So the next time through, you get an AttributeError. By simply passing the string as an argument to the list () function, you can easily create a list of all the characters in the string. ![]() The split() method splits a string into a list, where each list item is each word that. ![]() The first time through, you're adding the first word onto list_1, and then setting list_1 to None. The list () function is a common and efficient way to convert a string into a list of characters. way to convert a string to a list is by using the split() Python method. The only reason your existing code doesn't work is that list.append modifies a list in place, and returns None. Removing this assignment makes your code work: > first_list = Since None does not have a append method, on the next time around the loop you get the error. Since you assign the output of the method to the list1 variable, you overwrite the list with None on the first time around the loop. ,, ,, ,, ]Įdit: the attribute error you were getting is because the append() method of a list returns None. To do this for each of the words, we can use a list comprehension: > words = Since a string is an iterable object, we can pass it to list() to create a list of the individual characters. The split () method splits the strings, stores them in the list, and returns a list of the words using the delimiter as the delimiter string. > print(getsizeof('йцы'.The built-in list() function creates a list from an iterable object. Method 1: Using string split () To convert a string to a list in Python, you can use the string split () method. The sys.getsizeof() function does the same thing as in Python 3 - it returns count of bytes allocated to store the whole string object > print(getsizeof('йцы')) Then you can convert it to unicode object and get character count: > print(len('йцы'.decode('utf8'))) #String contains Cyrillic symbolsī. So, to count characters in str you should know which encoding your str object is using. That's because str can use variable-length encoding internally. The built-in method returns a list of the words in the string, using the delimiter as the delimiter string. Sometimes it will be equal to character count: > print(len('abc'))īut sometimes, it won't: > print(len('йцы')) # String contains Cyrillic symbols Method1: Using split () method The split method is used to split the strings and store them in the list. The len() function in Python 2 returns count of bytes allocated to store encoded characters in a str object. ![]() > print(getsizeof('please anwser my question'))Ī. To get memory size in bytes allocated to store str object, you can use sys.getsizeof() function > from sys import getsizeof To count number of characters in str object, you can use len() function: > print(len('please anwser my question'))ī. ![]()
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