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