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Converting all strings in list to integers in Python
Sometimes we can have a list containing strings but the strings themselves are numbers and closing quotes. In such a list we want to convert the string elements into actual integers.
With int()
The int function takes in parameters and converts it to integers if it is already a number. So we design a for loop to go through each element of the list and apply the in function. We store the final result into a new list.
Example
listA = ['5', '2','-43', '23']
# Given list
print("Given list with strings : \n",listA)
# using int
res = [int(i) for i in listA]
# Result
print("The converted list with integers : \n",res)Output
Running the above code gives us the following result −
Given list with strings : ['5', '2', '-43', '23'] The converted list with integers : [5, 2, -43, 23]
With map and list
The map function can be used to apply int function into every element that is present as a string in the given list.
Example
listA = ['5', '2','-43', '23']
# Given list
print("Given list with strings : \n",listA)
# using map and int
res = list(map(int, listA))
# Result
print("The converted list with integers : \n",res)Output
Running the above code gives us the following result −
Given list with strings : ['5', '2', '-43', '23'] The converted list with integers : [5, 2, -43, 23]
Updated on: 04-Jun-2020
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