Is it possible to make multiple assignments using a conditional expression?

Question

Here is the example:

age = 10
reject = False

if age < 10:
    st = 'Kid'
    reject = True

else:
    st='Adult'
    reject = False

Is it possible? Something like:

statement1:statement2 if age < 10 else statement3:statment4

I am still having problems with understanding ternary operator in Python.

The syntax you requested is not possible. The conditional expression syntax is true-expression if condition else false-expression. — Terry Jan Reedy
– Terry Jan Reedy, Commented Jun 1, 2017 at 21:55
@TerryJanReedy Well, you can actually bind names with expressions. globals().__setitem__('st', 'Kid'), for example. — wim
– wim, Commented Jun 1, 2017 at 22:03
Just use the if-else statement. There is no good reason to try to cram your code into a single line, especially if it requires weird, unidiomatic usage of language constructs not meant to achieve that. — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Jun 1, 2017 at 22:17

wim · Accepted Answer · 2017-06-01 21:46:53Z

7

Assignment statements support multiple targets:

>>> age = 10
>>> st, reject = ('Kid', True) if age < 10 else ('Adult', False)
>>> st, reject
('Adult', False)

answered Jun 1, 2017 at 21:46

wim

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2 Comments

metazord Over a year ago

is there another possible way??? assuming that if kid < 20, if less than 20 ONLY assign "rejected=True" and for adult assign st="Adult" and Rejected=False

wim Over a year ago

Technically possible, but ugly. Just use an if statement and stop trying to be so fancy.

rammelmueller · Accepted Answer · 2017-06-01 21:48:08Z

5

You could do it like this:

st, reject = ('Kid', True) if age < 10 else ('Adult', False)

answered Jun 1, 2017 at 21:48

rammelmueller

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2 Comments

metazord Over a year ago

is there another possible way??? assuming that if kid < 20, if less than 20 ONLY assign "rejected=True" and for adult st="Adult" and Rejected=False

rammelmueller Over a year ago

other than st, reject = (None, True) if age < 20 else ('Adult', False) i can't think of anything off the top of my head

Ender Look · Accepted Answer · 2017-06-01 22:24:40Z

0

You can use:

st, reject = ('Kid', True) if age < 10 else ('Adult', False)

When you use:

var1, var2 = 1, 2

You are doing the same as:

var1 = 1
var2 = 2

And when you use:

var1 = 1 if x == y else 2

Your are doing the same as:

if x == y:
    var1 = 1
else:
    var1 = 2

If you want with this define multiples variables you have to make a tuple () with the variables and they will be unpacked.

edited Jun 1, 2017 at 22:24

answered Jun 1, 2017 at 22:14

Ender Look

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