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Mar 16, 2018 · For Example for int class we can define bool as below: def __bool__(self): return self != 0. for bool (100), 100 !=0 will return True. So. bool (100) == True. you can easily check that bool(0) will be False. with this for instances of int class only 0 will return False.
Mar 21, 2010 · Some of the operators you may know from other languages have a different name in Python. The logical operators && and || are actually called and and or. Likewise the logical negation operator ! is called not. So you could just write: if len(a) % 2 == 0 and len(b) % 2 == 0: or even: if not (len(a) % 2 or len(b) % 2):
122. You can change the value of a bool all you want. As for an if: if randombool is True: works, but you can also use: if randombool: If you want to test whether something is false you can use: if randombool is False. but you can also use:
Since Python 2.6 you can use ast.literal_eval, and it's still available in Python 3.. Evaluate an expression node or a string containing only a Python literal or container display.
To update this for Python-3 you can do this "{} {}".format(True, False) However if you want to actually format the string (e.g. add white space), you encounter Python casting the boolean into the underlying C value (i.e. an int), e.g.
348. To negate a boolean, you can use the not operator: not bool. Or in your case, the if / return blocks can be replaced by: return not bool. Be sure to note the operator precedence rules, and the negated is and in operators: a is not b and a not in b. edited Apr 4, 2022 at 20:57.
Apr 30, 2017 · Convert inputs to booleans. Use the bitwise xor operator (^ or operator.xor) For example, bool(a) ^ bool(b) When you convert the inputs to booleans, bitwise xor becomes logical xor. Note that the accepted answer is wrong: != is not the same as xor in Python because of the subtlety of operator chaining.
Dec 8, 2013 · The correct operator to be used are the keywords 'or' and 'and', which in your example, the correct way to express this would be: if i == 5 and ii == 10: print "i is 5 and ii is 10". You can refer the details in the "Boolean Operations" section in the language reference. answered Mar 4, 2009 at 10:30. Seh Hui Leong.
Sep 2, 2021 · @AlbertChen: no, because numpy arrays broadcast comparisons and don't produce a boolean value. Instead, comparisons produce an array of boolean values. I'm not sure what you expect from an arrayvalue == 'true' comparison, the question I answered here is specific to a string (unicode) value.
Nov 24, 2009 · 4. Here's another solution: def my_and(a_list): return not (False in a_list) def my_or(a_list): return True in a_list. ANDing all elements will return True if all elements are True, hence no False in a list. ORing is similar, but it should return True if at least one True value is present in a list.
