Stef Mientki a écrit : > <Python> > def Some_Function (const): > print 'Ive been here', const > return True > > A = True > > if A and Some_Function (4 ): > print 'I knew it was True' > else: > print 'I''ll never print this' > </Python> > > <Output> > Ive been here 4 > I knew it was True > </Output > > I was expected that the function would not be called, > because A is True.
When using the *and* operator, the short-circuit evaluation is done if A is False (no need to know the other operand, the result cannot be True). But if A is True, the compiler must evaluate the second parameter to know the expression result. [note: for the or operator, the short circuit is done if first operand is True] A+ Laurent. PS. See http://en.wikipedia.org/wiki/Truth_table or google for boolean logic tables. -- http://mail.python.org/mailman/listinfo/python-list
