python3实现全角和半角字符转换的方法示例
作者:陈鹏 时间:2021-06-16 13:08:36
前言
本文主要给大家介绍了关于python3中全角和半角字符转换的相关内容,分享出来供大家参考学习,下面话不多说了,来一起看看详细的介绍吧。
一、背景介绍
解决什么问题:快速方便的对文本进行全角半角自动转换
适用什么场景:学生答题数据中全角字符替换为半角字符
二、全角半角原理
全角即:Double Byte Character,简称DBC
半角即:Single Byte Character,简称SBC
在 windows 中,中文和全角字符都占两个字节,并且使用了 asciichart 2 (codes 128–255);
全角字符的第一个字节总是被置为 163,而第二个字节则是相同半角字符码加上128(不包括空格,全角空格和半角空格也要考虑进去);
对于中文来说,它的第一个字节被置为大于163,如'阿'为:176 162,检测到中文时不进行转换。
例如:半角 a 为 65,则全角 a 是 163(第一个字节)、193(第二个字节,128+65)。
全角半角示例:(文本 test.txt 包含全角和半角字符)
F:\test>type test.txt
123456
123456
abcdefg
abcdefg
中国你好
三、使用 Python3 实现全角半角转换
# -*- coding:utf-8 -*-
# i@mail.chenpeng.info
”'
全角即:Double Byte Character,简称:DBC
半角即:Single Byte Character,简称:SBC
”'
def DBC2SBC(ustring):
”' 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 not (0x0021 <= inside_code and inside_code <= 0x7e):
rstring += uchar
continue
rstring += chr(inside_code)
return rstring
def SBC2DBC(ustring):
”' 半角转全角 ”'
rstring = “”
for uchar in ustring:
inside_code = ord(uchar)
if inside_code == 0x0020:
inside_code = 0x3000
else:
if not (0x0021 <= inside_code and inside_code <= 0x7e):
rstring += uchar
continue
inside_code += 0xfee0
rstring += chr(inside_code)
return rstring
s = ”'
array(‘0' => ‘0', ‘1' => ‘1', ‘2' => ‘2', ‘3' => ‘3', ‘4' => ‘4',
‘5' => ‘5', ‘6' => ‘6', ‘7' => ‘7', ‘8' => ‘8', ‘9' => ‘9',
‘A' => ‘A', ‘B' => ‘B', ‘C' => ‘C', ‘D' => ‘D', ‘E' => ‘E',
‘F' => ‘F', ‘G' => ‘G', ‘H' => ‘H', ‘I' => ‘I', ‘J' => ‘J',
‘K' => ‘K', ‘L' => ‘L', ‘M' => ‘M', ‘N' => ‘N', ‘O' => ‘O',
‘P' => ‘P', ‘Q' => ‘Q', ‘R' => ‘R', ‘S' => ‘S', ‘T' => ‘T',
‘U' => ‘U', ‘V' => ‘V', ‘W' => ‘W', ‘X' => ‘X', ‘Y' => ‘Y',
‘Z' => ‘Z', ‘a' => ‘a', ‘b' => ‘b', ‘c' => ‘c', ‘d' => ‘d',
‘e' => ‘e', ‘f' => ‘f', ‘g' => ‘g', ‘h' => ‘h', ‘i' => ‘i',
‘j' => ‘j', ‘k' => ‘k', ‘l' => ‘l', ‘m' => ‘m', ‘n' => ‘n',
‘o' => ‘o', ‘p' => ‘p', ‘q' => ‘q', ‘r' => ‘r', ‘s' => ‘s',
‘t' => ‘t', ‘u' => ‘u', ‘v' => ‘v', ‘w' => ‘w', ‘x' => ‘x',
‘y' => ‘y', ‘z' => ‘z',
‘(' => ‘(‘, ‘)' => ‘)', ‘〔' => ‘[‘, ‘〕' => ‘]', ‘【' => ‘[‘,
‘】' => ‘]', ‘〖' => ‘[‘, ‘〗' => ‘]', ‘”‘ => ‘[‘, ‘”‘ => ‘]',
‘\” => ‘[‘, ‘\” => ‘]', ‘{' => ‘{‘, ‘}' => ‘}', ‘《' => ‘<‘,
‘》' => ‘>',
‘%' => ‘%', ‘+' => ‘+', ‘—' => ‘-‘, ‘-' => ‘-‘, ‘~' => ‘-‘,
‘:' => ‘:', ‘。' => ‘.', ‘、' => ‘,', ‘,' => ‘.', ‘、' => ‘.',
‘;' => ‘,', ‘?' => ‘?', ‘!' => ‘!', ‘…' => ‘-‘, ‘‖' => ‘|',
‘”‘ => ‘”‘, ‘\” => ‘`', ‘\” => ‘`', ‘|' => ‘|', ‘〃' => ‘”‘,
‘' => ‘ ‘);
”'
# 全角转半角
print(DBC2SBC(s))
# 半角转全角
print(SBC2DBC(s))
s = ”'中文测试”'
# 全角转半角
print(DBC2SBC(s))
# 半角转全角
print(SBC2DBC(s))
四、总结
五、参考资料
http://thinkerou.com/2015-06/covert-dbc-sbc/
来源:http://chenpeng.info/html/3795
标签:python3,全角,半角
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