6、'bool', 函数用于将给定参数转换为布尔类型，如果没有参数，返回 False。
class bool(int) # 继承于int类型 | bool(x) -> bool # 创建bool类型的对象 | | Returns True when the argument x is true, False otherwise. # 参数x为真返回True，否则返回False。 | The builtins True and False are the only two instances of the class bool. # 内置True和False是仅有的2个bool类型的实例。 | The class bool is a subclass of the class int, and cannot be subclassed. # bool类是int类的子类，不能被继承。 | | Method resolution order: # MRO-方法解析顺序 | bool | int | object | | Methods defined here: | | __and__(self, value, /) | Return self&value. | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | __or__(self, value, /) | Return self|value. | | __rand__(self, value, /) | Return value&self. | | __repr__(self, /) | Return repr(self). | | __ror__(self, value, /) | Return value|self. | | __rxor__(self, value, /) | Return value^self. | | __str__(self, /) | Return str(self). | | __xor__(self, value, /) | Return self^value. | | ---------------------------------------------------------------------- | Methods inherited from int: | | __abs__(self, /) | abs(self) | | __add__(self, value, /) | Return self+value. | | __bool__(self, /) | self != 0 | | __ceil__(...) | Ceiling of an Integral returns itself. | | __divmod__(self, value, /) | Return divmod(self, value). | | __eq__(self, value, /) | Return self==value. | | __float__(self, /) | float(self) | | __floor__(...) | Flooring an Integral returns itself. | | __floordiv__(self, value, /) | Return self//value. | | __format__(...) | default object formatter | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getnewargs__(...) | | __gt__(self, value, /) | Return self>value. | | __hash__(self, /) | Return hash(self). | | __index__(self, /) | Return self converted to an integer, if self is suitable for use as an index into a list. | | __int__(self, /) | int(self) | | __invert__(self, /) | ~self | | __le__(self, value, /) | Return self<=value. | | __lshift__(self, value, /) | Return self<<value. | | __lt__(self, value, /) | Return self<value. | | __mod__(self, value, /) | Return self%value. | | __mul__(self, value, /) | Return self*value. | | __ne__(self, value, /) | Return self!=value. | | __neg__(self, /) | -self | | __pos__(self, /) | +self | | __pow__(self, value, mod=None, /) | Return pow(self, value, mod). | | __radd__(self, value, /) | Return value+self. | | __rdivmod__(self, value, /) | Return divmod(value, self). | | __rfloordiv__(self, value, /) | Return value//self. | | __rlshift__(self, value, /) | Return value<<self. | | __rmod__(self, value, /) | Return value%self. | | __rmul__(self, value, /) | Return value*self. | | __round__(...) | Rounding an Integral returns itself. | Rounding with an ndigits argument also returns an integer. | | __rpow__(self, value, mod=None, /) | Return pow(value, self, mod). | | __rrshift__(self, value, /) | Return value>>self. | | __rshift__(self, value, /) | Return self>>value. | | __rsub__(self, value, /) | Return value-self. | | __rtruediv__(self, value, /) | Return value/self. | | __sizeof__(...) | Returns size in memory, in bytes | | __sub__(self, value, /) | Return self-value. | | __truediv__(self, value, /) | Return self/value. | | __trunc__(...) | Truncating an Integral returns itself. | | bit_length(...) | int.bit_length() -> int | | Number of bits necessary to represent self in binary. | >>> bin(37) | '0b100101' | >>> (37).bit_length() | 6 | | conjugate(...) | Returns self, the complex conjugate of any int. | | from_bytes(...) from builtins.type | int.from_bytes(bytes, byteorder, *, signed=False) -> int | | Return the integer represented by the given array of bytes. | | The bytes argument must be a bytes-like object (e.g. bytes or bytearray). | | The byteorder argument determines the byte order used to represent the | integer. If byteorder is 'big', the most significant byte is at the | beginning of the byte array. If byteorder is 'little', the most | significant byte is at the end of the byte array. To request the native | byte order of the host system, use `sys.byteorder' as the byte order value. | | The signed keyword-only argument indicates whether two's complement is | used to represent the integer. | | to_bytes(...) | int.to_bytes(length, byteorder, *, signed=False) -> bytes | | Return an array of bytes representing an integer. | | The integer is represented using length bytes. An OverflowError is | raised if the integer is not representable with the given number of | bytes. | | The byteorder argument determines the byte order used to represent the | integer. If byteorder is 'big', the most significant byte is at the | beginning of the byte array. If byteorder is 'little', the most | significant byte is at the end of the byte array. To request the native | byte order of the host system, use `sys.byteorder' as the byte order value. | | The signed keyword-only argument determines whether two's complement is | used to represent the integer. If signed is False and a negative integer | is given, an OverflowError is raised. | | ---------------------------------------------------------------------- | Data descriptors inherited from int: | | denominator | the denominator of a rational number in lowest terms | | imag | the imaginary part of a complex number | | numerator | the numerator of a rational number in lowest terms | | real | the real part of a complex number