CODEWITHSUNDEEP
pythonarrayspython-3.x
Lord_JABA
Lord_JABA

Reputation: 2625

Python3 append value to array but only if it's not None

I got function that it's searching for something, and may not return anything. I want to append it to array but only if it return something

pseudocode

def fu():
    if sometring:
        return result

a = []
a.append(fu())

now if this function doesn't return value it appends "None" to array [result1, None, result2,etc], how to avoid that?

Upvotes: 8

Views: 15128

Answers (1)

SparkAndShine
SparkAndShine

Reputation: 18027

A function automatically returns None if you don't have a return statement. To avoid appending None to a list, check it before appending.

result = f()
if result:
    a.append(result)

Or use filter to filter out None in the end.

a = [1, 2, None, 3]
a = filter(None, a)

print(a)
# Output
[1, 2, 3]

Upvotes: 12

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