refixed with'r' 即r‘XXXX 来代替反斜杠\ ,因为 "\\\" 才能表示一个’\\‘ ,pattern string 大部分都 use Python’s raw string notation forregular expression patterns; >>>print"\\n" \n >>>printr"\n" \n >>> 1. 2. 3. 4. 5. 以上便是 r 的使用,可以减少一根反斜杠。 >>>len('...
r-Python’s raw string notation for regular expression\s— matches whitespace characters.+It will match one or more repetitions of whitespace character.$Matches the end of the string r正则表达式\sPython原始字符串表示法-匹配空白字符。+它将匹配一个或多个空白字符的重复。$匹配字符串的结尾 patternmen...
M|re.I)if matchObj: #加一个r表示是自然字符串不会被转义,例如\n在raw string中,是两个字符,\和n,而不会转意为换行符。由于正则表达式和\会有冲突,因此,当一个字符串使用了正则表达式后,最好在前面加上r print "match --> matchObj.group() : ", matchObj.group()else: print "No match!!"...
复制 l = [1, 2, 'hello', 'world'] # 列表中同时含有int和string类型的元素 l [1, 2, 'hello', 'world'] tup = ('jason', 22) # 元组中同时含有int和string类型的元素 tup ('jason', 22) 其次,我们必须掌握它们的区别。 列表是动态的,长度大小不固定,可以随意地增加、删减或者改变元素(mutab...
The raw string notation, r, ensures Python will not process special sequences in the string, such as \, \t, or \n. This means there won’t be any unexpected interactions between string special sequences and regular expression special sequences in the pattern search. There are no string ...
Updated String :- Hello Python Escape Characters 转义字符 Following table is a list of escape or non-printable characters that can be represented with backslash notation. An escape character gets interpreted; in a single quoted as well as double quoted strings. ...
很方便lassie帮你快速检索出一个网页中的内容PipeA Python library to use infix notation in Python顾...
obj,end=self.raw_decode(s,idx=_w(s,0).end())TypeError:expected string or buffer>>> 出错! 百思不得其解。经过调试,最终发现,python中默认使用单引号表示字符串"'" 所以当,用字符串符值以后,python会把双引号转换为单引号 代码语言:javascript ...
Now that we can define strings, we can try some simple operations on them. First let’s look at the + operation, known asconcatenation①. It produces a new string that is a copy of the two original strings pasted together end-to-end(首尾相连). Notice that concatenation doesn’t do anyt...
JSON (JavaScript Object Notation,) 是一种轻量级的数据交换格式。 2.2.1 json 文件的定义 简单的 json 示例 { "mysql": { "host": "127.0.0.1", "port": 3306, "user": "root", "password": "123456", "database": "test" } } 2.2.2 python 读取 json 文件 ...