python数据类型转换 python字

2023-01-31 02:01:11 python 数据类型 转换
原文地址为：python数据类型转换 Python字符串转浮点数 python字符串转float

 转载 Http://www.cnblogs.com/dabiao/arcHive/2010/03/07/1680096.html

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：

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 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 




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二、float函数将整数和字符串转换成浮点数。

 

举例：

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 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 




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三、str函数将数字转换成字符

 

举例：

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 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




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