Sorry I mistyped , this should be correct : bool_one = False and False --- This should give False because none of the statements are True bool_two = True and False --- This should give False because only 1 statement is True bool_three = False and True --- This should give False because only 1 statement is True bool_five = True and True --- This should give True because both statements are True
On Wednesday, May 4, 2016 at 11:10:28 PM UTC+8, Jussi Piitulainen wrote: > Cai Gengyang writes: > > > I am trying to understand the boolean operator "and" in Python. It is > > supposed to return "True" when the expression on both sides of "and" > > are true > > > > For instance, > > > > 1 < 3 and 10 < 20 is True --- (because both statements are true) > > Yes. > > > 1 < 5 and 5 > 12 is False --- (because both statements are false) > > No :) > > > bool_one = False and False --- This should give False because none of the > > statements are False > > bool_two = True and False --- This should give False because only 1 > > statement is True > > bool_three = False and True --- This should give False because only 1 > > statement is True > > Yes. > > > bool_five = True and True --- This should give True because only 1 > > statement is True > > No :) > > > Am I correct ? > > Somewhat. > > In a technical programming-language sense, these are "expressions", not > "statements". Technically, if the first expression evaluates to a value > that counts as true in Python, the compound expression "E and F" > evaluates to the value of the second expression. > > Apart from False, "empty" values like 0, "", [] count as false in > Python, and all the others count as true. > > But it's true that "E and F" only evaluates to a true value when both E > and F evaluate to a true value. > > Your subject line is good: Python's "and" is indeed a conditional, > control-flow operator. -- https://mail.python.org/mailman/listinfo/python-list
