CODEWITHSUNDEEP
pythonlistlist-comprehension
Nizamuddin Shaikh
Nizamuddin Shaikh

Reputation: 420

Get two lists out of one list using one line list comprehension in Python

I have one list containing True and False values. Using list comprehension, out of this list, I can get two separate lists where one has only True values and the other one has only False values as under:

aList  = [True, False, False, True, False, True, True]
trues  = [ x for x in aList if x==True ]
falses = [ x for x in aList if x==False ]

print(trues)  # [True, True, True, True]
print(falses) # [False, False, False]

Is it possible to get two separate lists out of one list using list comprehension in one line? Something like:

trues, falses = [ [a,b] for x in aList a=True if x else b=False]

Here, I get the error: "SyntaxError: invalid syntax" mentioning caret just below 'True' of a=True

Upvotes: 1

Views: 1048

Answers (1)

Gamopo
Gamopo

Reputation: 1598

It's more or less the same that you have but compressed in one line:

aList  = [True, False, False, True, False, True, True]
trues,falses  = [x for x in aList if x], [x for x in aList if not x]

This way you'll get two lists. If you enclose it in brackets, you'll get one list.

Upvotes: 1

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