Argument of the bool function

[candide]

About the standard function bool(), Python's official documentation 
tells us the following :

bool([x])
Convert a value to a Boolean, using the standard truth testing procedure.

In this context, what exactly a "value" is referring to ?


For instance,


>>> x=42
>>> bool(x=5)
True
>>>


but _expression_ :

x=42


has no value.






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