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

# Python code to convert list  
# of string into list of list 
  
# List initialization 
Input = ['Geeeks, Forgeeks', '65.7492, 62.5405', 
         'Geeks, 123', '555.7492, 152.5406'] 
           
temp = [] 
  
# Getting elem in list of list format 
for elem in Input: 
    temp2 = elem.split(', ') 
    temp.append((temp2)) 
  
# List initialization 
Output = []  
  
# Using Iteration to convert  
# element into list of list 
for elem in temp: 
    temp3 = [] 
    for elem2 in elem: 
        temp3.append(elem2) 
    Output.append(temp3) 
  
# printing 
print(Output) 

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 
  
# importing 
import ast 
  
# List Initialization 
Input = ['12, 454', '15.72, 82.85', '52.236, 25256', '95.9492, 72.906'] 
  
# using ast to convert 
Output = [list(ast.literal_eval(x)) for x in Input] 
  
# printing 
print(Output) 

Output:

[[12, 454], [15.72, 82.85], [52.236, 25256], [95.9492, 72.906]]

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Improved By : mayank5326, shubham_singh