Python | Convert given list into nested list
Some times, we come over the data that is in string format in a list and it is required to convert it into a list of the list. This kind of problem of converting a list of strings to nested list is quite common in web development. Let’s discuss certain ways in which this can be performed.
Method #1: Using iteration
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# Python code to convert list # of string into list of list # List initializationInput = ['Geeeks, Forgeeks', '65.7492, 62.5405', 'Geeks, 123', '555.7492, 152.5406'] temp = [] # Getting elem in list of list formatfor elem in Input: temp2 = elem.split(', ') temp.append((temp2)) # List initializationOutput = [] # Using Iteration to convert # element into list of listfor elem in temp: temp3 = [] for elem2 in elem: temp3.append(elem2) Output.append(temp3) # printingprint(Output) |
[[‘Geeeks’, ‘Forgeeks’], [‘65.7492’, ‘62.5405’], [‘Geeks’, ‘123’], [‘555.7492’, ‘152.5406’]]
Method #2 : Using ast [list with numeric values]
# Python code to convert list # of string into list of list # importingimport ast # List InitializationInput = ['12, 454', '15.72, 82.85', '52.236, 25256', '95.9492, 72.906'] # using ast to convertOutput = [list(ast.literal_eval(x)) for x in Input] # printingprint(Output) |
[[12, 454], [15.72, 82.85], [52.236, 25256], [95.9492, 72.906]]
