Java like statement of condition?a:b in python

Question

Is there a way to make the print_str function be more concise and becomes one line?

   def print_str(str):
        if len(str)>0:
            print(str + ", "+ "hi")
        else:
            print("hi")

   if __name__ == '__main__':
        print_str(("John"))
        print_str((""))

In java we can do something like

print(str + (str.equals("") ? "" : ", ") + "hi");

Note: don't name variables `str`. That's a builtin python method/type — OneCricketeer, Sep 05 '18 at 03:17
Also, you don't need `if len(str)>0:`, just do `if str:`. Empty collections (including strings) are falsey; non-empty ones are truthy. — abarnert, Sep 05 '18 at 03:18
Also, why the extra parens around the arguments to `print_str`? They aren't doing anything. — abarnert, Sep 05 '18 at 03:19

score 0 · Answer 1 · answered Sep 05 '18 at 03:15

0

Yes you can do something similar in a one line if else statement with python. In your example it would be like this:

print(str + ("" if str == "" else ", ") + "hi")

The format is X if condition else Y where X is the result if the condition is true and Y is the result otherwise.

answered Sep 05 '18 at 03:15

Karl

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Or `print(str + ",hi" if len(str) > 0 else "hi")` – OneCricketeer Sep 05 '18 at 03:18
1

@cricket_007: Or just test `str` instead of `len(str) > 0` or `not str` instead of `str == ""` following [the PEP8 recommendation](https://www.python.org/dev/peps/pep-0008/#programming-recommendations): "For sequences, (strings, lists, tuples), use the fact that empty sequences are false", which explicitly `if seq` and `if not seq` as preferable to any test involving `len`. – ShadowRanger Sep 05 '18 at 03:26

Java like statement of condition?a:b in python

1 Answers1