Method # 1: Using strip () + split ()
The combination of strip and split function can accomplish a specific task. The strip function can be used to remove parentheses, and the split function can separate the list of data with commas.
| # Python3 demo code
# to convert a list of strings to a list of list
# using strip () + split ()
# initializing list test_list = [ ’[1, 4, 5]’ , ’[4, 6, 8]’ ]
# print original list print ( "The origi nal list is: " + str (test_list))
# using strip () + split ()
# to convert a list of strings to a list of lists res = [i.strip ( "[]" ). split ( "," ) for i in test_list]
# print result print ( "The list after conversion is:" + str (res)) |
Output:
The original list is: [’[1, 4, 5]’, ’[4, 6, 8]’] The list after conversion is: [[’1 ’,’ 4’, ’5’], [’ 4’, ’6’,’ 8’]]
Method # 2: Using a split list and split ()
The task done in the above way can also be done using a slice of the list, in which we split all the elements from the second to the second last element, hence omitting the last parentheses.
| # Python3 demo code
# to convert a list of strings to a list of list
# using list slicing + split ()
# initializing list < code class = "plain"> test_list = [ ’[1, 4, 5] ’ , ’ [4, 6, 8] ’ ]
# print original list print ( "The original list is:" + str (test_list))
# using the list splitting + split ()
# to transform the list lines to the list of list res = [ i [ 1 : - 1 < code class = "plain">]. split ( ’,’ ) for i in test_list]
# print result print ( "The list after conversion is:" + str (res)) |
Output:
The original list is: [’[1, 4, 5]’, ’[4, 6, 8] ’] The list after conversion is: [[’ 1’, ’4’,’ 5’], [’4’,’ 6’, ’8’]]
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