Python shorthand conditional
Question:
Here’s a quick one…
In Python one can do:
foo = foo1 if bar1 else foo2
And that’s cool, but how can I just get a True or False without having to write
foo = True if bar1 else False
For example, in JS you can forcibly cast a boolean type by doing
var foo = !!bar1;
Answers:
Call bool on the object:
bool(bar1)
Similar to JavaScript, you can use logical negation in Python. This uses the keyword not. One disvantage of bool function is you can change its value as this is not a reserved word. If bool variable’s value is not callable. For example, bool = 7, an error will be raised. If bool variable’s value is callable. For example, bool = int, you may not get your expected value.
JavaScript
!!bar1
Python
not not bar1
Here’s a quick one…
In Python one can do:
foo = foo1 if bar1 else foo2
And that’s cool, but how can I just get a True or False without having to write
foo = True if bar1 else False
For example, in JS you can forcibly cast a boolean type by doing
var foo = !!bar1;
Call bool on the object:
bool(bar1)
Similar to JavaScript, you can use logical negation in Python. This uses the keyword not. One disvantage of bool function is you can change its value as this is not a reserved word. If bool variable’s value is not callable. For example, bool = 7, an error will be raised. If bool variable’s value is callable. For example, bool = int, you may not get your expected value.
JavaScript
!!bar1
Python
not not bar1