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  2. Python | Convert list of strings to list of list

Python | Convert list of strings to list of list

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`]]