CODEWITHSUNDEEP
pythonstringlisttype-conversioninteger
JayJay123
JayJay123

Reputation: 313

Convert Non-List Type to List Directly

I have a list of items that I need to actually be a list of lists. All the conversion methods I have seen convert the non-list items to lists of individual characters ["12", "cat", 87] to [['1', '2'], ['c', 'a', 't'], ['8', '7']] instead of [['12'], ['cat'], [87]]. The following works,

v_Data = ["12", "cat", 87]
for index, i in enumerate(v_Data):
    if type(i) != list:
        v_Data[index] = [i]
print(v_Data) ## [['12'], ['cat'], [87]]

Is there a better way to do this?

Using Python 2.7

Upvotes: 1

Views: 847

Answers (3)

Ender Look
Ender Look

Reputation: 2401

You can use a list comprehension:

v_Data = ["12", "cat", 87]

new = [[x] for x in v_Data]

Similar to:

v_Data = ["12", "cat", 87]

new = []
for x in v_Data:
    new.append([x])

Upvotes: 0

Dadep
Dadep

Reputation: 2788

you can do : 

>>> a=["12", "cat", 87]
>>> b=[[i] for i in a]
>>> b
[['12'], ['cat'], [87]]

EDIT : if there is already list in your list :

>>> a=["12", "cat", 87, [23]]
>>> b=[[i] if type(i) is not list else i for i in a]
>>> b
[['12'], ['cat'], [87], [23]]

Upvotes: 1

akuiper
akuiper

Reputation: 214957

You can use list-comprehension:

v_Data = ["12", "cat", 87]

[v if isinstance(v, list) else [v] for v in v_Data]
# [['12'], ['cat'], [87]]

Upvotes: 3

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