Python shortcut for variable default value to be another variable value if it is None [duplicate]

Question

I have the following function declaration:

def set_data(obj=None, name='delp', type=None):

Is there a python shortcut, where type is equal with 'name' value(default r passed) if is None ?

Don't use reserved words, for your own sake (and probably everyone else working with your code), please :) — han solo
– han solo, Commented Feb 20, 2019 at 16:26

Peter DeGlopper · Accepted Answer · 2019-02-20 16:27:41Z

5

The usual idiom is:

def set_data(obj=None, name='delp', type=None):
    if type is None:
        type = name

(But don't actually use type as a variable name, it'll mask the built in function as described here: Is it safe to use the python word "type" in my code?)

answered Feb 20, 2019 at 16:27

Peter DeGlopper

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5 Comments

Sraw Over a year ago

It could be just type = type or name.

Phydeaux Over a year ago

@Sraw note that this will assign the default if the variable is any false-y value, not just None

Peter DeGlopper Over a year ago

Sraw - that's not identical in behavior. The empty string is not None but it is false, just for one example. If you want to be as concise as possible, a conditional expression (docs.python.org/3/reference/…) is one alternative.

Sraw Over a year ago

@PeterDeGlopper Correct, but as here type seems to be a string. And there are only two kinds of false values: empty string or None. It could be enough. Although I admit it is not enough for many other situations.

r.ook Over a year ago

@Sraw an equivalent one liner would be type = name if type is None else type

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