python how to "negate" value : if true return false, if false return true
PythonBooleanNegatePython Problem Overview
if myval == 0:
nyval=1
if myval == 1:
nyval=0
Is there a better way to do a toggle in python, like a nyvalue = not myval ?
Python Solutions
Solution 1 - Python
Use the not boolean operator:
nyval = not myval
not returns a boolean value (True or False):
>>> not 1
False
>>> not 0
True
If you must have an integer, cast it back:
nyval = int(not myval)
However, the python bool type is a subclass of int, so this may not be needed:
>>> int(not 0)
1
>>> int(not 1)
0
>>> not 0 == 1
True
>>> not 1 == 0
True
Solution 2 - Python
In python, not is a boolean operator which gets the opposite of a value:
>>> myval = 0
>>> nyvalue = not myval
>>> nyvalue
True
>>> myval = 1
>>> nyvalue = not myval
>>> nyvalue
False
And True == 1 and False == 0 (if you need to convert it to an integer, you can use int())
Solution 3 - Python
Use not, for example:
return not myval
Solution 4 - Python
variable = not (False | variable)
is similar to
if variable == True:
variable = False
elif variable == False:
variable = True