passing boolean function to if-condition in python

Question

I"m learning python, and I'm trying to do this, which I thought should be trivial, but apparently, it's not.

$python
>>> def isTrue(data):
...     "ping" in data
... 
>>> if isTrue("ping"):
...     print("pong")       >>>>>>>>>>>>>> shouldn't this print "pong"???
... 
>>>

sshashank124 · Accepted Answer · 2014-05-11 02:55:35Z

1

You actually need to return the value. Then, it will work.

>>> def isTrue(data):
...     return "ping" in data
... 
>>> if isTrue("ping"):
...     print("pong")
...
pong
>>>

answered May 11, 2014 at 2:55

sshashank124

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3 Comments

One Two Three Over a year ago

Oooh! That makes sense! Jeese, I can't believe being a java-pgrammaer for all these years, I could forget such a thing. I always thought Python was the "magic" language where you could almost write anything, and the interpreter would understand. :)

sshashank124 Over a year ago

@OneTwoThree, python is awesome no doubt. But we all have limits. :)

Gary Walker Over a year ago

If you do not have an explicit return, python will return the value None -- so it is kindof magic still. :)

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