🔒 Booleans

[errant schooner]

What does a boolean do? Which commands is considered boolean?
I understood that boolean is either true or false but may i have an example?

print(bool(1))
True

What does this mean, what does one have to do with true

print(bool(0))
False

Same question here, what's this and why is it false?

Kindly advise,
Thank you!

[main crypt]

@errant schooner

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[green crypt]

bool is a type, much like, say, int. In fact, it's a subclass of int - that's why you can do True + True and get 2. Unlike most types, there's only two values a bool can take - either True or False. Whether something becomes True when converted to bool is called "truthiness". For the builtin types there are fairly consistent rules on what objects are truthy:

• a number is truthy if it's not equal to zero, falsy otherwise
• a collection (list, tuple, set, dict, and also including strings) is truthy if it's nonempty.

[magic shoal]

a Boolean (bool type in python) is a data type which represents a single logical value, True or False

when you use bool(something), that evaluates whenever that 'something' is considered true-ish or false-ish

traditionally you have 0 = false and 1 = true, but when converting from other types to booleans in python you have

• 0 is False, all other numbers are treated as True
• empty collections (text strings, lists, dictionaries, etc) are considered as False, and collections with at least one element are considered as True (effectively bool(x) == bool(len(x)) in this case)
• other nonstandard objects can define a custom rule that determines whenever it returns true or false when evaluated

[green crypt]

Another notable point: conditions, like in an if-statement, get implicitly cast to bool. You might have seen people do if some_lst: if you've read python code. That's equivalent to if len(some_lst) > 0:, since collections such as lists are truthy if they are nonempty.

[magic shoal]

also, as for why 0 = false, 1 = true: that is pretty much how things work ever since digital computers were invented
1 = on = true
0 = off = false

[green crypt]

stares meaningfully at Bash yeah, imagine if it was 0 that's truthy, haha

[errant schooner]

Thanks!

[main crypt]

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🔒 Booleans