2.1.Python字符串處理
2.1.1.去掉空格或者特殊字符
2.1.2.替換操作
2.1.3.查找操作
2.1.4.判斷操作
2.1.5.分割合并操作
2.1.6.字符串文檔

2.1.Python字符串處理

2.1.1.去掉空格或者特殊字符

# -*- coding: UTF-8 -*-""" 1、去掉空格或者特殊字符 """ input_str = ' 今天天氣不錯(cuò)，今天挺風(fēng)和日麗的 ' # 去掉兩邊的空格 print(input_str.strip())# 去掉右邊的空格 print(input_str.rstrip())# 去掉左邊的空格 print(input_str.lstrip())input_str = 'AAA今天天氣不錯(cuò)，挺風(fēng)和日麗的AAA' # 去掉所有帶A字符的 print(input_str.strip('A'))# 去掉左邊邊含有A的 print(input_str.lstrip('A'))# 去掉右邊含有A的 print(input_str.rstrip('A'))

效果如下：

2.1.2.替換操作

# -*- coding: UTF-8 -*-input_str = 'AAA今天天氣不錯(cuò)，挺風(fēng)和日麗的AAA' """ 2、替換操作 """ print(input_str.replace('今天','昨天')) ''' 輸出結(jié)果： AAA昨天天氣不錯(cuò)，挺風(fēng)和日麗的AAA '''print(input_str.replace('今天','')) ''' 輸出結(jié)果： AAA天氣不錯(cuò)，挺風(fēng)和日麗的AAA '''

2.1.3.查找操作

# -*- coding: UTF-8 -*-input_str = 'AAA今天天氣不錯(cuò)，挺風(fēng)和日麗的AAA'print(input_str.find('今天')) """ 輸出結(jié)果： 3 """

2.1.4.判斷操作

# -*- coding: UTF-8 -*-input_str = '123'print(input_str.isalpha()) ''' 輸出結(jié)果： False '''print(input_str.isdigit()) ''' 輸出結(jié)果： True '''

2.1.5.分割合并操作

# -*- coding: UTF-8 -*-input_str = '今天 天氣 不錯(cuò)，今天 挺 風(fēng)和日麗 的' input_str = input_str.split(' ') print(input_str) ''' 輸出結(jié)果： ['今天', '天氣', '不錯(cuò)，今天', '挺', '風(fēng)和日麗', '的'] '''print(''.join(input_str)) ''' 輸出結(jié)果： 今天天氣不錯(cuò)，今天挺風(fēng)和日麗的 '''

2.1.6.字符串文檔

Help on class str in module builtins:class str(object)| str(object='') -> str| str(bytes_or_buffer[, encoding[, errors]]) -> str| | Create a new string object from the given object. If encoding or| errors is specified, then the object must expose a data buffer| that will be decoded using the given encoding and error handler.| Otherwise, returns the result of object.__str__() (if defined)| or repr(object).| encoding defaults to sys.getdefaultencoding().| errors defaults to 'strict'.| | Methods defined here:| | __add__(self, value, /)| Return self+value.| | __contains__(self, key, /)| Return key in self.| | __eq__(self, value, /)| Return self==value.| | __format__(self, format_spec, /)| Return a formatted version of the string as described by format_spec.| | __ge__(self, value, /)| Return self>=value.| | __getattribute__(self, name, /)| Return getattr(self, name).| | __getitem__(self, key, /)| Return self[key].| | __getnewargs__(...)| | __gt__(self, value, /)| Return self>value.| | __hash__(self, /)| Return hash(self).| | __iter__(self, /)| Implement iter(self).| | __le__(self, value, /)| Return self<=value.| | __len__(self, /)| Return len(self).| | __lt__(self, value, /)| Return self<value.| | __mod__(self, value, /)| Return self%value.| | __mul__(self, value, /)| Return self*value.| | __ne__(self, value, /)| Return self!=value.| | __repr__(self, /)| Return repr(self).| | __rmod__(self, value, /)| Return value%self.| | __rmul__(self, value, /)| Return value*self.| | __sizeof__(self, /)| Return the size of the string in memory, in bytes.| | __str__(self, /)| Return str(self).| | capitalize(self, /)| Return a capitalized version of the string.| | More specifically, make the first character have upper case and the rest lower| case.| | casefold(self, /)| Return a version of the string suitable for caseless comparisons.| | center(self, width, fillchar=' ', /)| Return a centered string of length width.| | Padding is done using the specified fill character (default is a space).| | 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.| | encode(self, /, encoding='utf-8', errors='strict')| Encode the string using the codec registered for encoding.| | encoding| The encoding in which to encode the string.| errors| The error handling scheme to use for encoding errors.| The 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.| | endswith(...)| S.endswith(suffix[, start[, end]]) -> bool| | 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.| | expandtabs(self, /, tabsize=8)| Return a copy where all tab characters are expanded using spaces.| | If tabsize is not given, a tab size of 8 characters is assumed.| | find(...)| 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.| | format(...)| S.format(*args, **kwargs) -> str| | Return a formatted version of S, using substitutions from args and kwargs.| The substitutions are identified by braces ('{' and '}').| | format_map(...)| S.format_map(mapping) -> str| | Return a formatted version of S, using substitutions from mapping.| The substitutions are identified by braces ('{' and '}').| | index(...)| S.index(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.| | Raises ValueError when the substring is not found.| | isalnum(self, /)| Return True if the string is an alpha-numeric string, False otherwise.| | A string is alpha-numeric if all characters in the string are alpha-numeric and| there is at least one character in the string.| | isalpha(self, /)| Return True if the string is an alphabetic string, False otherwise.| | A string is alphabetic if all characters in the string are alphabetic and there| is at least one character in the string.| | isascii(self, /)| Return True if all characters in the string are ASCII, False otherwise.| | ASCII characters have code points in the range U+0000-U+007F.| Empty string is ASCII too.| | isdecimal(self, /)| Return True if the string is a decimal string, False otherwise.| | A string is a decimal string if all characters in the string are decimal and| there is at least one character in the string.| | isdigit(self, /)| Return True if the string is a digit string, False otherwise.| | A string is a digit string if all characters in the string are digits and there| is at least one character in the string.| | isidentifier(self, /)| Return True if the string is a valid Python identifier, False otherwise.| | Call keyword.iskeyword(s) to test whether string s is a reserved identifier,| such as "def" or "class".| | islower(self, /)| Return True if the string is a lowercase string, False otherwise.| | A string is lowercase if all cased characters in the string are lowercase and| there is at least one cased character in the string.| | isnumeric(self, /)| Return True if the string is a numeric string, False otherwise.| | A string is numeric if all characters in the string are numeric and there is at| least one character in the string.| | isprintable(self, /)| Return True if the string is printable, False otherwise.| | A string is printable if all of its characters are considered printable in| repr() or if it is empty.| | isspace(self, /)| Return True if the string is a whitespace string, False otherwise.| | A string is whitespace if all characters in the string are whitespace and there| is at least one character in the string.| | istitle(self, /)| Return True if the string is a title-cased string, False otherwise.| | In a title-cased string, upper- and title-case characters may only| follow uncased characters and lowercase characters only cased ones.| | isupper(self, /)| Return True if the string is an uppercase string, False otherwise.| | A string is uppercase if all cased characters in the string are uppercase and| there is at least one cased character in the string.| | join(self, iterable, /)| Concatenate any number of strings.| | The string whose method is called is inserted in between each given string.| The result is returned as a new string.| | Example: '.'.join(['ab', 'pq', 'rs']) -> 'ab.pq.rs'| | ljust(self, width, fillchar=' ', /)| Return a left-justified string of length width.| | Padding is done using the specified fill character (default is a space).| | lower(self, /)| Return a copy of the string converted to lowercase.| | lstrip(self, chars=None, /)| Return a copy of the string with leading whitespace removed.| | If chars is given and not None, remove characters in chars instead.| | partition(self, sep, /)| Partition the string into three parts using the given separator.| | This will search for the separator in the string. If the separator is found,| returns a 3-tuple containing the part before the separator, the separator| itself, and the part after it.| | If the separator is not found, returns a 3-tuple containing the original string| and two empty strings.| | replace(self, old, new, count=-1, /)| Return a copy with all occurrences of substring old replaced by new.| | count| Maximum number of occurrences to replace.| -1 (the default value) means replace all occurrences.| | If the optional argument count is given, only the first count occurrences are| replaced.| | rfind(...)| S.rfind(sub[, start[, end]]) -> int| | Return the highest 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.| | rindex(...)| S.rindex(sub[, start[, end]]) -> int| | Return the highest 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.| | Raises ValueError when the substring is not found.| | rjust(self, width, fillchar=' ', /)| Return a right-justified string of length width.| | Padding is done using the specified fill character (default is a space).| | rpartition(self, sep, /)| Partition the string into three parts using the given separator.| | This will search for the separator in the string, starting at the end. If| the separator is found, returns a 3-tuple containing the part before the| separator, the separator itself, and the part after it.| | If the separator is not found, returns a 3-tuple containing two empty strings| and the original string.| | rsplit(self, /, sep=None, maxsplit=-1)| Return a list of the words in the string, using sep as the delimiter string.| | sep| The delimiter according which to split the string.| None (the default value) means split according to any whitespace,| and discard empty strings from the result.| maxsplit| Maximum number of splits to do.| -1 (the default value) means no limit.| | Splits are done starting at the end of the string and working to the front.| | rstrip(self, chars=None, /)| Return a copy of the string with trailing whitespace removed.| | If chars is given and not None, remove characters in chars instead.| | split(self, /, sep=None, maxsplit=-1)| Return a list of the words in the string, using sep as the delimiter string.| | sep| The delimiter according which to split the string.| None (the default value) means split according to any whitespace,| and discard empty strings from the result.| maxsplit| Maximum number of splits to do.| -1 (the default value) means no limit.| | splitlines(self, /, keepends=False)| Return a list of the lines in the string, breaking at line boundaries.| | Line breaks are not included in the resulting list unless keepends is given and| true.| | startswith(...)| S.startswith(prefix[, start[, end]]) -> bool| | Return True if S starts with the specified prefix, False otherwise.| With optional start, test S beginning at that position.| With optional end, stop comparing S at that position.| prefix can also be a tuple of strings to try.| | strip(self, chars=None, /)| Return a copy of the string with leading and trailing whitespace removed.| | If chars is given and not None, remove characters in chars instead.| | swapcase(self, /)| Convert uppercase characters to lowercase and lowercase characters to uppercase.| | title(self, /)| Return a version of the string where each word is titlecased.| | More specifically, words start with uppercased characters and all remaining| cased characters have lower case.| | translate(self, table, /)| Replace each character in the string using the given translation table.| | table| Translation table, which must be a mapping of Unicode ordinals to| Unicode ordinals, strings, or None.| | The table must implement lookup/indexing via __getitem__, for instance a| dictionary or list. If this operation raises LookupError, the character is| left untouched. Characters mapped to None are deleted.| | upper(self, /)| Return a copy of the string converted to uppercase.| | zfill(self, width, /)| Pad a numeric string with zeros on the left, to fill a field of the given width.| | The string is never truncated.| | ----------------------------------------------------------------------| Static methods defined here:| | __new__(*args, **kwargs) from builtins.type| Create and return a new object. See help(type) for accurate signature.| | maketrans(...)| Return a translation table usable for str.translate().| | If there is only one argument, it must be a dictionary mapping Unicode| ordinals (integers) or characters to Unicode ordinals, strings or None.| Character keys will be then converted to ordinals.| If there are two arguments, they must be strings of equal length, and| in the resulting dictionary, each character in x will be mapped to the| character at the same position in y. If there is a third argument, it| must be a string, whose characters will be mapped to None in the result.

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