Python
How to Convert String to List in Python
By Krunal Last updated Jan 21, 2022 0
The data type conversion is the most common operation in the Python language. In this tutorial, we will see How To Convert Python String to List and List to String. Then, we will try to convert the given string to a list, where spaces or any other special characters.
Python string to list
To convert string to list in Python, use the string split[] method. Thesplit[] method splits the strings and store them in the list. Then, itreturns a list of the words in the string, using the delimiteras the delimiter string.
If the delimiter is not specified in the function argument or is None, then a different splitting algorithm is applied: its runs of consecutive whitespace are regarded as the single separator.
The result will contain no empty strings at the start or end of the string if the string has leading or trailing whitespace.
See the following code example to understand more.
# app.py def stringToList[string]: listRes = list[string.split[" "]] return listRes strA = "Millie Bobby Brown" print[stringToList[strA]]See the output.
pyt python3 app.py ['Millie', 'Bobby', 'Brown'] pytYou can check the data type using the Python type[] function.
Output
pyt python3 app.py pytPython string to list using strip[] and split[]
The strip[] method returns the copy of a string with both leading and trailing characters removed based on the string argument passed. In addition, the strip[] method removes characters from both left and right based on the argument.
See the following code.
# app.py initial_list = "[11, 21, 29, 46, 19]" print ["initial string", initial_list] print [type[initial_list]] op = initial_list.strip[']['].split[', '] print ["final list", op] print [type[op]]Output
pyt /usr/local/bin/python3 /Users/krunal/Desktop/code/pyt/app.py initial string [11, 21, 29, 46, 19] final list ['11', '21', '29', '46', '19'] pytSo, first, we have defined a string that looks like a list.
Then we use the strip[] and split[] method to convert the string to a list, and finally, we print the list and its type for double-checking.
Convert using AST[Abstract Syntax Trees] module
Python ast module helps Python applications to process the trees of abstract syntax grammar.
The abstract syntax might change with each Python release; this module helps determine programmatically what the current grammar looks like.
The abstract syntax tree can be generated by passing the ast.
PyCF_ONLY_AST as the flag to the compile[] built-in function, or using a parse[] helper function provided in this module.
The result will be a tree of objects whose classes all inherit from the ast module.
See the following code example.
# app.py import ast # initializing string representation of a list ini_list = "[11, 21, 19, 46, 29]" # printing intialized string of list and its type print["initial string", ini_list] print[type[ini_list]] # Converting string to list res = ast.literal_eval[ini_list] # printing final result and its type print["final list", res] print[type[res]]Output
pyt python3 app.py initial string [11, 21, 19, 46, 29] final list [11, 21, 19, 46, 29] pytPython string to list using json.loads[]
There is a third way to convert the Python string to a list using json.loads[] method.
# app.py import json # initializing string representation of a list initial_list = "[11, 21, 19, 46, 29]" # printing intialized string of list and its type print["initial string", initial_list] print[type[initial_list]] # Converting string to list op = json.loads[initial_list] # printing final result and its type print["final list", op] print[type[op]]Output
pyt python3 app.py initial string [11, 21, 19, 46, 29] final list [11, 21, 19, 46, 29] pytFirst, we need to import a json module and then use the json.loads[] method to convert the string to a list format.
Thats it for converting Python String to list data type tutorial.
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The data type conversion is the most common operation in the Python language. In this tutorial, we will see How To Convert Python String to List and List to String. Then, we will try to convert the given string to a list, where spaces or any other special characters.
Python string to list
To convert string to list in Python, use the string split[] method. Thesplit[] method splits the strings and store them in the list. Then, itreturns a list of the words in the string, using the delimiteras the delimiter string.
If the delimiter is not specified in the function argument or is None, then a different splitting algorithm is applied: its runs of consecutive whitespace are regarded as the single separator.
The result will contain no empty strings at the start or end of the string if the string has leading or trailing whitespace.
See the following code example to understand more.
# app.py def stringToList[string]: listRes = list[string.split[" "]] return listRes strA = "Millie Bobby Brown" print[stringToList[strA]]See the output.
pyt python3 app.py ['Millie', 'Bobby', 'Brown'] pytYou can check the data type using the Python type[] function.
# app.py def stringToList[string]: listRes = list[string.split[" "]] return listRes strA = "Millie Bobby Brown" print[type[stringToList[strA]]]Output
pyt python3 app.py pytPython string to list using strip[] and split[]
The strip[] method returns the copy of a string with both leading and trailing characters removed based on the string argument passed. In addition, the strip[] method removes characters from both left and right based on the argument.
See the following code.
Output
pyt /usr/local/bin/python3 /Users/krunal/Desktop/code/pyt/app.py initial string [11, 21, 29, 46, 19] final list ['11', '21', '29', '46', '19'] pytSo, first, we have defined a string that looks like a list.
Then we use the strip[] and split[] method to convert the string to a list, and finally, we print the list and its type for double-checking.
Convert using AST[Abstract Syntax Trees] module
Python ast module helps Python applications to process the trees of abstract syntax grammar.
The abstract syntax might change with each Python release; this module helps determine programmatically what the current grammar looks like.
The abstract syntax tree can be generated by passing the ast.
PyCF_ONLY_AST as the flag to the compile[] built-in function, or using a parse[] helper function provided in this module.
The result will be a tree of objects whose classes all inherit from the ast module.
See the following code example.
# app.py import ast # initializing string representation of a list ini_list = "[11, 21, 19, 46, 29]" # printing intialized string of list and its type print["initial string", ini_list] print[type[ini_list]] # Converting string to list res = ast.literal_eval[ini_list] # printing final result and its type print["final list", res] print[type[res]]Output
pyt python3 app.py initial string [11, 21, 19, 46, 29] final list [11, 21, 19, 46, 29] pytPython string to list using json.loads[]
There is a third way to convert the Python string to a list using json.loads[] method.
# app.py import json # initializing string representation of a list initial_list = "[11, 21, 19, 46, 29]" # printing intialized string of list and its type print["initial string", initial_list] print[type[initial_list]] # Converting string to list op = json.loads[initial_list] # printing final result and its type print["final list", op] print[type[op]]Output
pyt python3 app.py initial string [11, 21, 19, 46, 29] final list [11, 21, 19, 46, 29] pytFirst, we need to import a json module and then use the json.loads[] method to convert the string to a list format.
Thats it for converting Python String to list data type tutorial.
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