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+--- Thread: how to return False in ternary condition (/thread-31397.html)
how to return False in ternary condition - KEYS - Dec-08-2020
The code below is running inside a while True loop
if play=='y':
print('ok')
else:
return FalseI would like to write those lines in a ternary form.Problem with my code is it seems you cannot return in ternary conditions.
print('ok') if play=='y' else return FalseIs there a way to achieve this?
RE: how to return False in ternary condition - jefsummers - Dec-08-2020
Other than for style, why do you want to do that?
RE: how to return False in ternary condition - MrBitPythoner - Dec-08-2020
You can achieve this with semicolons. You dont ordinarily see ; in python, but you can use them.
print("hi");print("hi again")
RE: how to return False in ternary condition - bowlofred - Dec-08-2020
The ternary syntax is a special form of an expression, and is limited to expressions only. It isn't a full control flow like a real "if" statement. You can't put statements like "return" into those expressions.
RE: how to return False in ternary condition - deanhystad - Dec-10-2020
Semicolons just make linters angry. One statement per line please. Why do people like to write dense, unreadable code?
RE: how to return False in ternary condition - MK_CodingSpace - Dec-10-2020
return statement can only be used in a function, not elsewhere
RE: how to return False in ternary condition - deanhystad - Dec-10-2020
Quote:return statement can only be used in a function, not elsewhereThis may or may not be a problem here. We have no context provided for the code in question. But this is invalid Python if it is in a function or not. "return" is not an expression. A ternary expression is "expression condition expression". In
answer = 'odd' if x % 2 else 'even''even' and 'odd' are expressions and 'if x % 2 else' is the condition.
An expression is something that evaluates to a value. A string is an expression. An equation is an expression. A function call is an expression. A "return", ironically, is not an expression because it does not evaluate to a value.
RE: how to return False in ternary condition - perfringo - Dec-10-2020
Some additional tidbits. In Python there is conditional expression set forth in PEP308.
Guido in Python-Dev list:
Quote:Pleas stop calling it 'ternary expression'. That doesn't explain
what it means. It's as if we were to refer to the + operator as
'binary expression'.