How to declare an array as a function parameter in Python?

Question

I have declared an empty list. I want to store in that one some strings from a text file. If I am doing without creating TXT_to_PList it is working smoothly. But using TXT_to_PList length of deTrimis array will be 0. Why?

deTrimis = []

def TXT_to_PList(fileName,array):
    with open(fileName) as f:
        array = f.read().splitlines()
TXT_to_PList('strings.txt',deTrimis)
print (len(deTrimis))

Which version of Python are you actually interested in?

Scott Hunter
– Scott Hunter

2020-04-14 16:42:57 +00:00
Commented Apr 14, 2020 at 16:42 — Scott Hunter
– Scott Hunter, Commented Apr 14, 2020 at 16:42

Peter · Accepted Answer · 2020-04-14 16:59:19Z

1

You don't need that empty list at all:

def TXT_to_PList(fileName):
    with open(fileName) as f:
        return f.read().splitlines()

deTrimis = TXT_to_PList('strings.txt')

answered Apr 14, 2020 at 16:59

Peter

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1 Comment

Viorel Over a year ago

This is what I needed. Thank you so much!

RafalS · Accepted Answer · 2020-04-14 16:44:51Z

0

You can't modify function argument by assignment, change it to:

array.extend(f.read().splitlines())

see more info here: Why can a function modify some arguments as perceived by the caller, but not others?

answered Apr 14, 2020 at 16:44

RafalS

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