python3实现全角和半角字符转换的方法示例
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 ascii chart 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
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对脚本之家的支持。
五、参考资料
http://thinkerou.com/2015-06/covert-dbc-sbc/
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