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HomeBackend DevelopmentPython TutorialExamples of raw string and Unicode string operators in Python

这篇文章主要介绍了Python原始字符串与Unicode字符串操作符用法,结合实例形式分析了Python针对原始字符与Unicode字符的操作符用法,需要的朋友可以参考下

本文实例讲述了Python原始字符串与Unicode字符串操作符用法。分享给大家供大家参考,具体如下:


#coding=utf8
'''''
在原始字符串里,所有的字符串都是直接按照字面的意思来使用,
没有转义特殊或不能打印的字符。
正则表达式是一些告诫搜索匹配方式的字符串,
通过是由代表字符、分组、匹配信息、变量名、字符类等的特殊符号组成。
在原始字符串紧靠第一个引号前,需要加上r或R字母,来表示该字符是原始字符串。
原始字符串和普通字符串有这几乎完全相同的语法。
Unicode字符串操作符,大写的U和小写的u是在Python1.6中和Unicode字符串一起被引入的。
它用来把标准字符串或者包含Unicode字符的字符串转换成完全的Unicode字符串对象。
字符串方法和正则表达式引擎也支持Unicode。
Unicode操作符也可以接受原始Unicode字符串,只要将Unicode操作符和原始字符串操作符连接在一起。
注意:Unicode操作符必须出现在原始字符串操作符前面。
'''
import re
#原始操作符函数
def originalOper():
  #不是原始字符表示换行符
  print "\n"
  #是原始字符表示\n
  print r"\n"
  try:
    #对文件路径加r,不需要对\进行转义
    #文件路径中表示斜线
    testFile=open(r"E:\PythonDemo\CorePythonBook2\output","r")
    for line in testFile.readlines():
      #通过格式化字符串
      #优先使用repr()函数转换为原始字符
      line="%r" %line
      #对匹配模式进行加r处理
      #匹配的字符转换为原始字符
      m=re.search(r"\\[rn]",line)
      #字符串中是否包含匹配字符
      #如果包含输出该字符串
      if m is not None:
        print line
  except Exception,e:
    print e
  finally:
    testFile.close()
#Unicode操作符函数
def  unicodeOper():
  print u"abc"
  print u"\u1234"
  print u"abc\u1234\n"
  print ur"Hello\nWorld!"
#调用函数
#输出操作原始字符结果
originalOper()
#输出Unicode字符串
unicodeOper()

运行结果如下:

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