渗透之Python学习（str字符串）

感谢大家的关注，小编我今天又要挖一个坑啦，分享Python的学习笔记。

都说网络安全这条路，python语言是必学的。为什么呢？因为一旦网上爆出某个漏洞，你得会用Python去编写EXP利用它呀。这样可以避免没必要的人力，直接脚本检测就ok啦。如果你对这个没有详细的概念，可以看我前面的那篇redis获取服务器权限的文章。只要运行脚本，就可以直接代替人省略了十多步操作，直接获取权限，是不是很方便呢。

从现在起我会不间断的分享我的Python学习笔记，供大家学习。

因为篇幅字数有限，没有办法把所有的笔记都放在这里。有兴趣的读者可以私聊我或者加群：928233686领取我的所有笔记。

下图是我要不断分享的Python模块笔记，附带源码解释，中文翻译和各种实例，让你对该模块有更深入的理解。

# capitalize() 将第一个字母大写'''capitalize(...) S.capitalize() -> str Return a capitalized version of S, i.e. make the first character have upper case and the rest lower case.'''#print(help(str.capitalize))a = 'asdffghjkl'b = a.capitalize()print(b) # b = Asdffghjkl-------------------------------------------------------------------------------------------# casefold() 返回小写，与lower()类似，但lower只针对ASCII，casefold()针对Unicode()'''casefold(...) S.casefold() -> str Return a version of S suitable for caseless comparisons.'''print(help(str.casefold))a = 'ASD'b = a.casefold()print(b) # b = asd-------------------------------------------------------------------------------------------# 用指定的宽度来返回一个居中版的s，# 如果需要的话，就用fillchar进行填充，默认是空格。但是不会对s进行截取。# 即如果s的长度比width大，也不会对s进行截取。'''center(...) S.center(width[, fillchar]) -> str Return S centered in a string of length width. Padding is done using the specified fill character (default is a space)'''print(help(str.center))a = 'asdfghjkl'b = a.center(20, '-') # 长度为20，a字符串居中，左右用数字5填充print(b) # b = 55555asdfghjkl555555-------------------------------------------------------------------------------------------'''count(...) S.count(sub[, start[, end]]) -> int Return the number of non-overlapping occurrences of substring sub in string S[start:end]. Optional arguments start and end are interpreted as in slice notation.'''print(help(str.count))a = 'askdfksghjkl'b = a.count('k') # 从下标为1到5计数‘s’的个数print(b) # b = 2-------------------------------------------------------------------------------------------# 以 encoding 指定的编码格式编码字符串。errors参数可以指定不同的错误处理方案。'''encode(...) S.encode(encoding='utf-8', errors='strict') -> bytes Encode S using the codec registered for encoding. Default encoding is 'utf-8'. errors may be given to set a different error handling scheme. Default is 'strict' meaning that encoding errors raise a UnicodeEncodeError. Other possible values are 'ignore', 'replace' and 'xmlcharrefreplace' as well as any other name registered with codecs.register_error that can handle UnicodeEncodeErrors.'''print(help(str.encode))a = 'asdfsghjkl'b = a.encode('utf-8')print(b) # b = b'asdfsghjkl'-------------------------------------------------------------------------------------------# 判断字符串是否以指定后缀结尾，如果以指定后缀结尾返回True，否则返回False。# 可选参数"start"与"end"为检索字符串的开始与结束位置。'''endswith(...) S.endswith(suffix[, start[, end]]) -> bool suffix -- 该参数可以是一个字符串或者是一个元素。 start -- 字符串中的开始位置。 end -- 字符中结束位置。 Return True if S ends with the specified suffix, False otherwise. With optional start, test S beginning at that position. With optional end, stop comparing S at that position. suffix can also be a tuple of strings to try.'''print(help(str.endswith))a = 'asdfsghjk'b = a.endswith('k')c = a.endswith('j')d = a.endswith('a', 0, 1)e = a.endswith('a', 0, 2)print(b) # b = Trueprint(c) # c = Falseprint(d) # d = Trueprint(e) # e = False-------------------------------------------------------------------------------------------# 判断字符串是否以指定后缀结尾，如果以指定后缀结尾返回True，否则返回False。# 可选参数"start"与"end"为检索字符串的开始与结束位置。'''expandtabs(...) S.expandtabs(tabsize=8) -> str Return a copy of S where all tab characters are expanded using spaces. If tabsize is not given, a tab size of 8 characters is assumed.'''print(help(str.expandtabs))a = 'asdfsghjk'b = a.endswith('k')c = a.endswith('j')d = a.endswith('a', 0, 1)e = a.endswith('a', 0, 2)print(b) # b = Trueprint(c) # c = Falseprint(d) # d = Trueprint(e) # e = False-------------------------------------------------------------------------------------------'''find(...) 检测字符串中是否包含子字符串 str ， 如果指定 beg（开始）和 end（结束）范围，则检查是否包含在指定范围内， 如果包含子字符串，则返回开始的索引值，否则返回-1。 S.find(sub[, start[, end]]) -> int Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 on failure.'''print(help(str.find))a = 'asdfsghjk'b = a.find('d')c = a.find('f', 1, 4) #d = a.find('f', 1, 3)print(b) # 2 下标print(c) # 2 从第一个字符到第三个字符中找，找到了则返回下标print(d) # -1-------------------------------------------------------------------------------------------'''format(...) # 格式换字符串输出（方法与%相似，但可以指定顺序） S.format(*args, **kwargs) -> str Return a formatted version of S, using substitutions from args and kwargs. The substitutions are identified by braces ('{' and '}').None'''print(help(str.format))name = 'ske'fruit = 'apple'a = 'my name is {},I like {}'.format(name,fruit)b = 'my name is {1},I like {0}'.format(fruit,name)c = 'my name is {mingzi},I like {shuiguo}'.format(shuiguo=fruit,mingzi=name)print(a) # my name is ske,I like appleprint(b) # my name is StivenWang,I like appleprint(c) # my name is StivenWang,I like apple-------------------------------------------------------------------------------------------'''index(...) 检测字符串string中是否包含子字符串 str ， 如果存在，则返回str在string中的索引值， 如果指定beg（开始）和 end（结束）范围，则检查是否包含在指定范围内， 该方法与 python find()方法一样，只不过如果str不在 string中会报一个异常(ValueError: substring not found)。 S.index(sub[, start[, end]]) -> int Like S.find() but raise ValueError when the substring is not found.None'''# print(help(str.index))a = "this is string example....wow!!!"b = "exam"#c = a.index(b)d = a.index(b, 20)#print(c) # 15 返回b字符串的第一个字符的索引值print(d) # 报错-------------------------------------------------------------------------------------------'''isalnum(...) 检测字符串是否由字母或数字组成 S.isalnum() -> bool Return True if all characters in S are alphanumeric and there is at least one character in S, False otherwise.None'''print(help(str.isalnum))a = "thisisstringexamplewow"b = "123"c = 'asdf1234'd = 'asdf!@@#'e = 'a = "this is string example wow"'print(a.isalnum()) # True 全部由字母构成print(b.isalnum()) # True 全部由数字构成print(c.isalnum()) # True 全部由字母或者数字构成print(d.isalnum()) # False 有特殊字符print(e.isalnum()) # False 有空格-------------------------------------------------------------------------------------------'''isalpha(...) 检测字符串是否只由字母组成 S.isalpha() -> bool Return True if all characters in S are alphabetic and there is at least one character in S, False otherwise.None'''print(help(str.isalpha))a = "thisisstringexamplewow"b = "123"c = 'asdf1234'd = 'asdf!@@#'e = 'a = "this is string example wow"'print(a.isalpha()) # True 全部由字母构成print(b.isalpha()) # False 有数字print(c.isalpha()) # False 有数字print(d.isalpha()) # False 没有字母print(e.isalpha()) # False 有空格-------------------------------------------------------------------------------------------

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