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Python实现全角半角转换的方法

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Release: 2016-06-16 08:42:48
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本文实例讲解了Python实现全角半角转换的方法,相信对于大家的Python学习能够起到一定的参考借鉴价值。如下所示:

一、全角半角转换概述:

全角字符unicode编码从65281~65374 (十六进制 0xFF01 ~ 0xFF5E)
半角字符unicode编码从33~126 (十六进制 0x21~ 0x7E)
空格比较特殊,全角为 12288(0x3000),半角为 32 (0x20)
而且除空格外,全角/半角按unicode编码排序在顺序上是对应的
所以可以直接通过用+-法来处理非空格数据,对空格单独处理

二、全角转半角:

实现代码如下:

def strQ2B(ustring):
  """把字符串全角转半角"""
  rstring = ""
  for uchar in ustring:
    inside_code=ord(uchar)
    if inside_code==0x3000:
      inside_code=0x0020
    else:
      inside_code-=0xfee0
    if inside_code<0x0020 or inside_code>0x7e:   #转完之后不是半角字符返回原来的字符
      rstring += uchar
    rstring += unichr(inside_code)
  return rstring

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三、半角转全角:

实现代码如下:

def strB2Q(ustring):
  """把字符串半角转全角"""
  rstring = ""
  for uchar in ustring:
    inside_code=ord(uchar)
    if inside_code<0x0020 or inside_code>0x7e:   #不是半角字符就返回原来的字符
      rstring += uchar
    if inside_code==0x0020: #除了空格其他的全角半角的公式为:半角=全角-0xfee0
      inside_code=0x3000
    else:
      inside_code+=0xfee0
    rstring += unichr(inside_code)
  return rstring

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四、测试代码:

a = strB2Q("abc12345")
print a
b = strQ2B(a)
print b

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输出:

abc12345
abc12345

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感兴趣的朋友可以调试运行一下,相信会有一定的收获。

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