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）
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F:\test>type test.txt
123456
１２３４５６
abcdefg
ａｂｃｄｅｆｇ
中国你好
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三、使用 Python3 实现全角半角转换
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# -*- 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))
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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，谢谢大家对服务器之家的支持。
五、参考资料
http://thinkerou.com/2015-06/covert-dbc-sbc/
原文链接：http://chenpeng.info/html/3795