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python基础知识积累(一)数据类型转换

2011-07-13 13:20 716 查看

数据类型转换

一、int函数能够

(1)把符合数学格式的数字型字符串转换成整数

(2)把浮点数转换成整数,但是只是简单的取整,而非四舍五入。

举例:

1 aa = int("124")    #Correct
2  print "aa = ", aa  #result=124
3  bb = int(123.45) #correct
4  print "bb = ", bb #result=123
5  cc = int("-123.45")  #Error,Can't Convert to int
6  print "cc = ",cc
7 dd = int("34a")    #Error,Can't Convert to int
8 print "dd = ",dd
9 ee = int("12.3") #Error,Can't Convert to int
10 print ee
11


二、float函数将整数和字符串转换成浮点数。

举例:

1 aa = float("124")     #Correct
2 print "aa = ", aa     #result = 124.0
3 bb = float("123.45")  #Correct
4 print "bb = ", bb     #result = 123.45
5 cc = float(-123.6)    #Correct
6 print "cc = ",cc      #result = -123.6
7 dd = float("-123.34") #Correct
8 print "dd = ",dd      #result = -123.34
9 ee = float('123v')    #Error,Can't Convert to float
10 print ee


三、str函数将数字转换成字符

举例:

1 aa = str(123.4)     #Correct
2 print aa            #result = '123.4'
3 bb = str(-124.a)    #SyntaxError: invalid syntax
4 print bb
5 cc = str("-123.45") #correct
6 print cc            #result = '-123.45'
7 dd = str('ddd')     #correct
8 print dd            #result = ddd
9 ee = str(-124.3)    #correct
10 print ee            #result = -124.3


reference:

http://www.cnblogs.com/dabiao/category/234041.html

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