python内置方法、模块讲解(二十八)

  • 2016-07-03 18:38:00
  • 1600
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七十二、str类

1、定义:

class str(basestring)
 |  str(object='') -> string
 |
 |  Return a nice string representation of the object.
 |  If the argument is a string, the return value is the same object.
 |
 |  Method resolution order:
 |      str
 |      basestring
 |      object

2、解释:返回一个对象的string表现方式

3、举例:

>>> str(1)
'1'
>>> str(u"fdsa")
'fdsa'
>>> import datetime
>>> str(datetime.datetime.now())
'2016-07-03 18:29:41.422000'

七十三、sum方法

1、定义:

sum(...)
    sum(sequence[, start]) -> value

    Return the sum of a sequence of numbers (NOT strings) plus the value
    of parameter 'start' (which defaults to 0).  When the sequence is
    empty, return start.

2、解释:返回一个数字序列与start变量总和
3、举例:

>>> sum(range(5))

10

>>> sum(range(5),3)

13

 


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