交互器中python中的帮助使用

C:\Users\ceshi>python
Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 27 2016, 15:24:40) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import copy
>>> dir(copy)
['Error', 'PyStringMap', '_EmptyClass', '__all__', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '_copy_dispatch', '_copy_immutable', '_copy_inst',
'_copy_with_constructor', '_copy_with_copy_method', '_deepcopy_atomic', '_deepcopy_dict', '_deepcopy_dispatch', '_deepcopy_inst', '_deepcopy_list', '_deepcopy_method',
'_deepcopy_tuple', '_keep_alive', '_reconstruct', '_test', 'copy', 'deepcopy', 'dispatch_table', 'error', 'name', 't', 'weakref']

>>> [n for n in dir(copy) if not n.startswith('__')]
['Error', 'PyStringMap', '_EmptyClass', '_copy_dispatch', '_copy_immutable', '_copy_inst', '_copy_with_constructor', '_copy_with_copy_method', '_deepcopy_atomic',
'_deepcopy_dict', '_deepcopy_dispatch', '_deepcopy_inst', '_deepcopy_list', '_deepcopy_method', '_deepcopy_tuple', '_keep_alive', '_reconstruct', '_test', 'copy', 'deepcopy',
'dispatch_table', 'error', 'name', 't', 'weakref']
>>> copy.__all__
['Error', 'copy', 'deepcopy']

#用help获取帮助
>>> help(copy.copy)
Help on function copy in module copy:

copy(x)
Shallow copy operation on arbitrary Python objects.

See the module's __doc__ string for more info.

#快速查看函数的参数

>>> print range.__doc__
range(stop) -> list of integers
range(start, stop[, step]) -> list of integers

Return a list containing an arithmetic progression of integers.
range(i, j) returns [i, i+1, i+2, ..., j-1]; start (!) defaults to 0.
When step is given, it specifies the increment (or decrement).
For example, range(4) returns [0, 1, 2, 3]. The end point is omitted!
These are exactly the valid indices for a list of 4 elements.

#查看源码位置，找到对应.py文件打开即可查看
>>> print copy.__file__
D:\Python27\lib\copy.pyc