python内置方法、模块讲解（六）

• 2016-03-01 23:47:46
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• python
• authen

十八、copyright方法、credits方法

​此二种方法不做多解释， 直接上例子：

>>> credits
    Thanks to CWI, CNRI, BeOpen.com, Zope Corporation and a cast of thousands
    for supporting Python development.  See www.python.org for more information.

>>> copyright
Copyright (c) 2001-2014 Python Software Foundation.
All Rights Reserved.

Copyright (c) 2000 BeOpen.com.
All Rights Reserved.

Copyright (c) 1995-2001 Corporation for National Research Initiatives.
All Rights Reserved.

Copyright (c) 1991-1995 Stichting Mathematisch Centrum, Amsterdam.
All Rights Reserved.

十九、delattr方法

​​​​1、定义：

delattr(...)
    delattr(object, name)

    Delete a named attribute on an object; delattr(x, 'y') is equivalent to
    ``del x.y''.

2、解释：删除一个对象已定义的属性，相当于 del object.name

3、举例：

>>> dir(datetime)
['MAXYEAR', 'MINYEAR', '__doc__', '__name__', '__package__', 'date', 'datetime', 'datetime_CAPI', 'time', 'timedelta', 'tzinfo']
>>> delattr(datetime, 'time')
>>> dir(datetime)
['MAXYEAR', 'MINYEAR', '__doc__', '__name__', '__package__', 'date', 'datetime', 'datetime_CAPI', 'timedelta', 'tzinfo']

二十、dict类

​1、定义：

class dict(object)
 |  dict() -> new empty dictionary
 |  dict(mapping) -> new dictionary initialized from a mapping object's
 |      (key, value) pairs
 |  dict(iterable) -> new dictionary initialized as if via:
 |      d = {}
 |      for k, v in iterable:
 |          d[k] = v
 |  dict(**kwargs) -> new dictionary initialized with the name=value pairs
 |      in the keyword argument list.  For example:  dict(one=1, two=2)

​2、解释：用于生成一个新字典，生成方式见举例。

​3、举例：

>>> dict()
{}
>>> dict([('a',4),('b',5)])
{'a': 4, 'b': 5}
>>> dict(a='4',b=5)
{'a': '4', 'b': 5}

二十一、dir方法

​​此方法前面的博客中已介绍过， 可点击http://www.aoyanming.com/blog/display/6查看