Initialize variable with default value in python

Question

I have a function like this:

def __init__(self, out_file='out.csv', tmp_folder=None):
    self.tmp_folder = tmp_folder if tmp_folder != None else join(getcwd(), '__tmp__')

I was wondering if ther exists a smarter way to do it, something like js:

    self.tmp_folder = tmp_folder || join(getcwd(), '__tmp__')

tmp_folder or join(getcwd(), '__tmp__')

mshsayem
– mshsayem

2014-04-30 02:18:22 +00:00
Commented Apr 30, 2014 at 2:18 — mshsayem
– mshsayem, Commented Apr 30, 2014 at 2:18

user2555451 · Accepted Answer · 2014-04-30 02:18:10Z

3

Since None evaluates to False, you could always do:

def __init__(self, out_file='out.csv', tmp_folder=None):
    self.tmp_folder = tmp_folder or join(getcwd(), '__tmp__')

Note however that this will assign self.tmp_folder to join(getcwd(), '__tmp__') if tmp_folder is any falsey value (False, 0, [], {}, etc.)

answered Apr 30, 2014 at 2:18

user2555451

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1 Comment

opensas Over a year ago

Gee, as soon as I finished writing the example I saw it, jeje

shaktimaan · Accepted Answer · 2014-04-30 02:18:30Z

2

Yes, like this:

self.tmp_folder = tmp_folder or join(getcwd(), '__tmp__')

You just use or instead of ||

answered Apr 30, 2014 at 2:18

shaktimaan

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