python help()函数（查看特定模块、关键词、函数等用法）

示例1：

import torch
help(torch.ones)

运行结果：

D:\Dontla_miniconda3.8\python.exe C:/Users/Administrator/Desktop/d2l/torch_code/code/test3.py
Help on built-in function ones:ones(...)ones(*size, *, out=None, dtype=None, layout=torch.strided, device=None, requires_grad=False) -> TensorReturns a tensor filled with the scalar value `1`, with the shape definedby the variable argument :attr:`size`.Args:size (int...): a sequence of integers defining the shape of the output tensor.Can be a variable number of arguments or a collection like a list or tuple.Keyword arguments:out (Tensor, optional): the output tensor.dtype (:class:`torch.dtype`, optional): the desired data type of returned tensor.Default: if ``None``, uses a global default (see :func:`torch.set_default_tensor_type`).layout (:class:`torch.layout`, optional): the desired layout of returned Tensor.Default: ``torch.strided``.device (:class:`torch.device`, optional): the desired device of returned tensor.Default: if ``None``, uses the current device for the default tensor type(see :func:`torch.set_default_tensor_type`). :attr:`device` will be the CPUfor CPU tensor types and the current CUDA device for CUDA tensor types.requires_grad (bool, optional): If autograd should record operations on thereturned tensor. Default: ``False``.Example::>>> torch.ones(2, 3)tensor([[ 1.,  1.,  1.],[ 1.,  1.,  1.]])>>> torch.ones(5)tensor([ 1.,  1.,  1.,  1.,  1.])进程已结束,退出代码0

示例2：

help(int)

D:\Dontla_miniconda3.8\python.exe C:/Users/Administrator/Desktop/d2l/torch_code/code/test3.py
Help on class int in module builtins:class int(object)|  int([x]) -> integer|  int(x, base=10) -> integer|  |  Convert a number or string to an integer, or return 0 if no arguments|  are given.  If x is a number, return x.__int__().  For floating point|  numbers, this truncates towards zero.|  |  If x is not a number or if base is given, then x must be a string,|  bytes, or bytearray instance representing an integer literal in the|  given base.  The literal can be preceded by '+' or '-' and be surrounded|  by whitespace.  The base defaults to 10.  Valid bases are 0 and 2-36.|  Base 0 means to interpret the base from the string as an integer literal.|  >>> int('0b100', base=0)|  4|  |  Built-in subclasses:|      bool|  |  Methods defined here:|  |  __abs__(self, /)|      abs(self)|  |  __add__(self, value, /)|      Return self+value.|  |  __and__(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__(self, format_spec, /)|      Default object formatter.|  |  __ge__(self, value, /)|      Return self>=value.|  |  __getattribute__(self, name, /)|      Return getattr(self, name).|  |  __getnewargs__(self, /)|  |  __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|  |  __or__(self, value, /)|      Return self|value.|  |  __pos__(self, /)|      +self|  |  __pow__(self, value, mod=None, /)|      Return pow(self, value, mod).|  |  __radd__(self, value, /)|      Return value+self.|  |  __rand__(self, value, /)|      Return value&self.|  |  __rdivmod__(self, value, /)|      Return divmod(value, self).|  |  __repr__(self, /)|      Return repr(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.|  |  __ror__(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.|  |  __rxor__(self, value, /)|      Return value^self.|  |  __sizeof__(self, /)|      Returns size in memory, in bytes.|  |  __sub__(self, value, /)|      Return self-value.|  |  __truediv__(self, value, /)|      Return self/value.|  |  __trunc__(...)|      Truncating an Integral returns itself.|  |  __xor__(self, value, /)|      Return self^value.|  |  as_integer_ratio(self, /)|      Return integer ratio.|      |      Return a pair of integers, whose ratio is exactly equal to the original int|      and with a positive denominator.|      |      >>> (10).as_integer_ratio()|      (10, 1)|      >>> (-10).as_integer_ratio()|      (-10, 1)|      >>> (0).as_integer_ratio()|      (0, 1)|  |  bit_length(self, /)|      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.|  |  to_bytes(self, /, length, byteorder, *, signed=False)|      Return an array of bytes representing an integer.|      |      length|        Length of bytes object to use.  An OverflowError is raised if the|        integer is not representable with the given number of bytes.|      byteorder|        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.|      signed|        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.|  |  ----------------------------------------------------------------------|  Class methods defined here:|  |  from_bytes(bytes, byteorder, *, signed=False) from builtins.type|      Return the integer represented by the given array of bytes.|      |      bytes|        Holds the array of bytes to convert.  The argument must either|        support the buffer protocol or be an iterable object producing bytes.|        Bytes and bytearray are examples of built-in objects that support the|        buffer protocol.|      byteorder|        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.|      signed|        Indicates whether two's complement is used to represent the integer.|  |  ----------------------------------------------------------------------|  Static methods defined here:|  |  __new__(*args, **kwargs) from builtins.type|      Create and return a new object.  See help(type) for accurate signature.|  |  ----------------------------------------------------------------------|  Data descriptors defined here:|  |  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进程已结束,退出代码0

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python help()函数（查看特定模块、关键词、函数等用法）

示例1：

示例2：

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