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16 Μαρ 2018 · Does Python actually contain a Boolean value? I know that you can do: checker = 1 if checker: #dostuff But I'm quite pedantic and enjoy seeing booleans in Java.
21 Μαρ 2010 · Note that this is pseudo-code not Python code. In Python you cannot create functions called and or or because these are keywords. Also you should never use "evaluate" or if bool(...). Customizing the behavior of your own classes. This implicit bool call can be used to customize how your classes behave with and, or and not.
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.
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:
30 Απρ 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.
27 Ιουλ 2020 · This will return True for any value of MY_ENV_VAR because the boolean value of any string is True in Python. Hence, also values like False , false , 0 , etc. will end up as True . Likely not what you want.
@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.
To answer the specific question: isinstance(x[0], (int, float)) This checks if x[0] is an instance of any of the types in the tuple (int, float). You can add bool in there, too, but it's not necessary, because bool is itself a subclass of int. Doc reference: isinstance() built-in numeric types.
346. 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.
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.
