How to use the dir () function and help () function in python
This article mainly introduces "how to use the dir () function and help () function in python". In daily operation, I believe that many people have doubts about how to use the dir () function and help () function in python. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about how to use the dir () function and help () function in python. Next, please follow the editor to study!
1. Dir () function
In python, the dir () function can return a list of variables, methods, and defined types in the current range without arguments, while the dir () function can return a list of properties and methods of parameters when it takes parameters.
Syntax:
Dir ([object]) # object refers to objects, variables, types.
Example:
> dir () # get the attribute list of the current module
['_ builtins__','_ _ doc__','_ _ name__','_ _ package__', 'arr',' myslice']
> dir ([]) # how to view the list
['_ _ add__','_ _ class__','_ _ contains__','_ _ delattr__','_ _ delitem__','_ _ delslice__','_ _ doc__','_ _ eq__','_ _ format__','_ _ ge__','_ getattribute__','_ getitem__','_ _ getslice__','_ _ gt__' '_ _ hash__',' _ _ iadd__','_ _ imul__','_ _ init__','_ _ iter__','_ _ le__','_ _ len__','_ _ lt__','_ _ mul__','_ _ ne__','_ new__','_ reduce__','_ reduce_ex__','_ _ repr__' '_ _ reversed__',' _ _ rmul__','_ _ setattr__','_ _ setitem__','_ _ setslice__','_ _ sizeof__','_ _ str__','_ _ subclasshook__', 'append',' count', 'extend',' index', 'insert',' pop', 'remove',' reverse', 'sort']
2. Help () function
In python, the help () function is mainly used to view a detailed description of the purpose of a function or module.
Syntax:
Help ([object]) # object refers to an object
Example:
> help ('sys') # View help for the sys module
…… Show help information...
> help ('str') # View help on str data types
…… Show help information...
> a = [1, 2, 2, 3]
> help (a) # View list list help information
…… Show help information...
>
…… Show help information...
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