Python 爬虫 Pretend10 2019-03-18 21:05:41 代码class Spider(): url = 'https://www.huya.com/g/lol' root_pattern = '[\s\S]*?'错误是Anomalous backslash in string: '\s'. String constant might be missing an r prefix. 2 回答 pardon110 TA贡献1038条经验 获得超227个赞 报错信息都告知...
原因分析:代码中间无意义的字符串 处理意见:若是注释代码,则用# 号或者删除;如果是doc_string就放在开始处 W0102(dangerous-default-value) 原因分析:使用了可变对象作为默认参数 处理意见:不要使用可变对象作为默认参数 W0122(exec-used) 原因分析:使用了exec 处理意见:避免使用exec W1401(anomalous-backslash-in-s...
可能的值还有'ignore', 'replace', 'xmlcharrefreplace', 'backslashreplace' 和所有的通过codecs.register_error注册的值。这一部分内容涉及codecs模块,不是特明白 S.decode([encoding,[errors]]) 字符串的测试函数,这一类函数在string模块中没有,这些函数返回的都是bool值: S.startwith(prefix[,start[,end]]...
There's not really any "rawstring"; there are rawstring literals, which are exactly the string literals marked by an'r'before the opening quote. A "raw string literal" is a slightly different syntax for a string literal,in which a backslash,\, is taken as meaning "just a backslash"(ex...
meaning that encoding errors raise a UnicodeError. Other possible values are 'ignore', 'replace', 'xmlcharrefreplace', 'backslashreplace' and any other name registered via codecs.register_error(), see section Codec Base Classes. For a list of possible encodings, see section Standard Encodings....
# 错误方式: print(f'{\'name\'} is a full stack hacker.') # SyntaxError: f-string expression part cannot include a backslash 3.2 打印双括号{} 用f字符串打印{}的方法是不同的, 非常容易出bug。这次我们不能使用反斜线。 name = 'Yang' # 1 print(f'{name} is a full stack hacker.') #...
index()方法与find()方法一样,如果包含子字符串则返回开始的索引值,只不过index()方法如果str不在 string中会报一个异常。 str = 'Python string Function' str_result = str.find('python', 1, len(str)) #find()查找的是子字符串在全字符串中出现的第一个位置,匹配到字符串就结束查找,不管后面还有没...
sub) Help on function sub in module re: sub(pattern, repl, string, count=0, flags=0) Return the string obtained by replacing the leftmost non-overlapping occurrences of the pattern in string by the replacement repl. repl can be either a string or a callable; if a string, backslash ...
repl can be either a string or a callable; if a string, backslash escapes in it are processed. If it is a callable, it's passed the Match object and must return a replacement string to be used. 函数参数说明 参数 描述 pattern 匹配的正则表达式 repl 替换的字符串或一个函数 string 要匹配...