Method # 1: Using List Comprehension
This problem can be solved by using list comprehension as a reduction in the general cycles that we would have to go through to accomplish this particular task, repeating each the line character of each list and converting to an integer.
| # Python3 demo code
# converting a list of strings to a list of integers
# using comprehension list
# initializing list test_list = [[ ’24’ ], [ ’45’ ], [ ’ 78’ ], [ ’40’ ]]
# print original list print ( "The original list:" + str (test_list))
# using comprehension list
# converting string list to list of integers res = [[ int (i) for i in sub] for i in test_list for sub in i]
# print result print ( "The list after conversion:" + str ( res)) |
Output:
The original list: [[’24’], [’ 45’], [’78’], [’ 40’]] The list after conversion: [[2, 4], [4, 5], [7, 8], [4, 0]]
Method # 2: Using map () + list comprehension
Problem executed in the above function can also be scaled down to include a display function that associates the conversion to integer with the function and the rest of the task is done the list comprehension function itself.
| # Python3 demo code
# convert a list of strings to a list integers
# using a list comprehension + map ()
# initializing list test_list = [[ ’24’ ], [ ’45’ ], [ ’ 78’ ] , [ ’40’ ]]
# print original list print ( "The original list:" + str (test_list))
# using comprehension list + map ()
# convert a list of strings to a list of integers res = [ list ( map ( int , list (sub [ 0 ]))) for sub in test_list if sub]
# print result print ( "The list after conversion:" + str (res)) |
Output:
The original list: [[’24’], [’ 45’], [’78’], [’ 40’]] The list after conversion: [[2, 4], [4, 5], [7, 8], [4, 0]]
