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Convert a string representation of list into list in Python
As python handles various data types, we will come across a situation where a list will appear in form of a string. In this article we will see how to convert a string into a list.
With strip and split
We first apply the strip method to remove the square brackets and then apply the split function. The split function with a comma as its parameter create the list from the string.
Example
stringA = "[Mon, 2, Tue, 5,]"
# Given string
print("Given string", stringA)
print(type(stringA))
# String to list
res = stringA.strip('][').split(', ')
# Result and its type
print("final list", res)
print(type(res))Output
Running the above code gives us the following result −
Given string [Mon, 2, Tue, 5,] final list ['Mon', '2', 'Tue', '5,']
With json.loads
The json module can make a direct conversion from string to list. We just apply the function by passing the string as a parameter. We can only consider numerical elements here.
Example
import json
stringA = "[21,42, 15]"
# Given string
print("Given string", stringA)
print(type(stringA))
# String to list
res = json.loads(stringA)
# Result and its type
print("final list", res)
print(type(res))Output
Running the above code gives us the following result −
Given string [21,42, 15] final list [21, 42, 15]
With ast.literal_eval
The ast module gives us literal_eval which can directly convert the string into a list. We just supply the string as a parameter to the literal_eval method. We can only consider numerical elements here.
Example
import ast
stringA = "[21,42, 15]"
# Given string
print("Given string", stringA)
print(type(stringA))
# String to list
res = ast.literal_eval(stringA)
# Result and its type
print("final list", res)
print(type(res))Output
Running the above code gives us the following result −
Given string [21,42, 15] final list [21, 42, 15]
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