CODEWITHSUNDEEP
pythonlist
Pradyumna P Rao
Pradyumna P Rao

Reputation: 31

Convert nested list in a string back to nested list

I have a nested list stored in string format, that I want to convert it to python list

ll ='[["ABC",7,"A",9],["ABD",6,"B",8]]'
ll = list(ll)
print(ll)

My expected output

[["ABC",7,"A",9],["ABD",6,"B",8]]

Received output

['[', '[', '"', 'A', 'B', 'C', '"', ',', '7', ',', '"', 'A', '"', ',', '9', ']', ',', '[', '"', 'A', 'B', 'D', '"', ',', '6', ',', '"', 'B', '"', ',', '8', ']', ']']

please help

Upvotes: 3

Views: 1261

Answers (4)

sam
sam

Reputation: 1896

Explanation of Error:

When you do list(ll), python is expected to convert the given input tuple/set/iterator into list.

In your case, ll is a string which is internally a list of characters. So, when you apply list(ll), Python is returning you a list of charecters.

Recommendation

As answered by @Zalak Bhalani, I would recommend json.loads.

import json

ll ='[["ABC",7,"A",9],["ABD",6,"B",8]]'
ll = json.loads(ll)
print(ll)

Upvotes: 2

Zalak Bhalani
Zalak Bhalani

Reputation: 1144

You can use json.

import json
ll='[["ABC",7,"A",9],["ABD",6,"B",8]]'
ll = json.loads(ll)
print(ll)

Upvotes: 2

Vishal Singh
Vishal Singh

Reputation: 6234

You can use ast.literal_eval to Safely evaluate an expression node or a string containing a Python literal or container display.

Note: The string or node provided may only consist of the following Python literal structures: strings, bytes, numbers, tuples, lists, dicts, sets, booleans, and None.

import ast

ll='[["ABC",7,"A",9],["ABD",6,"B",8]]'    
ll = ast.literal_eval(ll)

Output:

[['ABC', 7, 'A', 9], ['ABD', 6, 'B', 8]]

Upvotes: 6

Buddy Bob
Buddy Bob

Reputation: 5889

You can use ast.literal_eval

import ast
x =ast.literal_eval('[["ABC",7,"A",9],["ABD",6,"B",8]]')
print(type(x))
print(x)

output

<class 'list'>
[['ABC', 7, 'A', 9], ['ABD', 6, 'B', 8]]

Upvotes: 1

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