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def bool(x = …, /) -> ‘bool’
bool: returns the truth value of any starlark value. 
bool() == False
bool([]) == False
bool([1]) == True
bool(True) == True
bool(False) == False
bool(None) == False
bool(bool) == True
bool(1) == True
bool(0) == False
bool({}) == False
bool({1:2}) == True
bool(()) == False
bool((1,)) == True
bool("") == False
bool("1") == True