python实现字符串中的半全角转换

• 全角和半角的空格的Unicode值相差12256
• 除空格外的全角和半角的Unicode值相差65248

# -*- coding: utf-8 -*-

def strQ2B(ustring):

    """全角转半角"""

    rstring = ""

    for uchar in ustring:

        inside_code=ord(uchar)

        if inside_code == 12288:                              #全角空格直接转换,全角和半角的空格的Unicode值相差12256

            inside_code = 32

        elif (inside_code >= 65281 and inside_code <= 65374): #全角字符（除空格）根据关系转化,除空格外的全角和半角的Unicode值相差65248

            inside_code -= 65248

        rstring += unichr(inside_code)

    return rstring

def strB2Q(ustring):

    """半角转全角"""

    rstring = ""

    for uchar in ustring:

        inside_code=ord(uchar)

        if inside_code == 32:                                 #半角空格直接转化,全角和半角的空格的Unicode值相差12256

            inside_code = 12288

        elif inside_code >= 32 and inside_code <= 126:        #半角字符（除空格）根据关系转化,除空格外的全角和半角的Unicode值相差65248

            inside_code += 65248

        rstring += unichr(inside_code)

    return rstring

b = strQ2B("ｍｎ 123abc全角转半角".decode('utf-8'))

print b

c = strB2Q("ｍｎ123abc半角转全角".decode('utf-8'))

print c