CODEWITHSUNDEEP
python
shaneburgess
shaneburgess

Reputation: 15882

Python Version of Perl = || (= Or)

I can't seem to find a python way of saying 

x = y or 1

In Perl:

$x = $y || 1;

Is there a nice way to do this in python?

Upvotes: 0

Views: 124

Answers (5)

xpapad
xpapad

Reputation: 4456

All the solutions mentioned will work if y is defined (it can be None)

If y is not defined Python will throw an exception, while the Perl code will work in non-strict mode.

Upvotes: 2

unwind
unwind

Reputation: 399871

Python's or has what I believe are the semantics you're looking for. See the documentation. It's important to realize that it returns the input value(s), not True or False.

>>> "" or 12
12

>>> 27 or 9
27

>> None or "default"
'default'

This should mean that x = y or 1 should be what you're after, x will be y if y is non-False, else it will be 1.

Upvotes: 7

user647772
user647772

Reputation: 

y = 2
x = y if y else 1
# x == 2

y = None
x = y if y else 1
# x == 1

Upvotes: 4

dorsh
dorsh

Reputation: 24720

x = y or 1 is the same as:

if y:
  x = y
else:
  x = 1

Isn't it what you're trying to do?

Upvotes: 4

Felix Yan
Felix Yan

Reputation: 15259

A simple one but not that nice:

x = y if y else 1

Upvotes: 1

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