CODEWITHSUNDEEP
pythonlistmerge
Jothimani
Jothimani

Reputation: 137

Python: Merge list of lists with boolean item?

here i need to merge list of lists with a boolean item.

Input like this

list = [[[3, [1, 2]]], [[1, [2, 3]]], False, [[4, [4, 5]]]]

And excepted result is

[[3, [1, 2]], [1, [2, 3]], False, [4, [4, 5]]]

I tried this

res = []
for x in list:
   res.append(x)
print res

Thanks in advance...

Upvotes: 0

Views: 189

Answers (1)

Kasravnd
Kasravnd

Reputation: 107307

You can use a list comprehension to preserve the first element of your sub lists if they are valid (if sub) otherwise the sub list itself:

>>> lst = [[[3, [1, 2]]], [[1, [2, 3]]], False, [[4, [4, 5]]]]
>>> [sub[0] if sub else sub for sub in lst]
[[3, [1, 2]], [1, [2, 3]], False, [4, [4, 5]]]

Note : Don't use python keywords and built-in type's names as your variables and object names.

As @Padraic Cunningham suggested, for a more precise way you can use isinstance():

>>> [sub[0] if isinstance(sub, list) else sub for sub in lst]
[[3, [1, 2]], [1, [2, 3]], False, [4, [4, 5]]]

Upvotes: 3

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