import re pattern = r"\b\w{5}\b" # 匹配所有长度为5的单词 matches = re.findall(pattern, text) print(matches) # 输出: ['quick', 'brown', 'jumps'] new_text = re.sub(r"\bthe\b", "a", text) print(new_text) # 输出: A quick brown fox jumps aover a lazy dog. 在Web爬虫...
>>>webpage = WebPage("https://dusty.phillips.codes")>>>importtime>>>now = time.time() ; content1 = webpage.content ;print(time.time() - now) Retrieving New Page...0.6236202716827393>>>now = time.time() ; content2 = webpage.content ;print(time.time() - now)1.7881393432617188e-05...
fillchar只能是一个字符串,否者抛出异常:TypeError: The fill character must be exactly one character longs 'banana' s.ljust(10,'##') Traceback (most recent call last): File "C:\Program Files\Python310\lib\code.py", line 90, in runcode exec(code, self.locals) File "", line 1, in ...
字符串切片操作 test="Python Programming"print("String: ",test)# First one character first_character=test[:1]print("First Character: ",first_character)# Last one character last_character=test[-1:]print("Last Character: ",last_character)# Everything except the first one character except_first=...
[]: Creates a character set that matches any one of the characters inside the square brackets. +: Matches one or more occurrences of the preceding. When you arrange these different regex constructs into the concise pattern shown above, you can split your messy shopping list into useful substri...
split()) print(word_counts.most_common()) # 输出:[(‘the’, 2), (‘quick’, 1), ...] 以上仅为Python字符串操作的一部分内容,随着后续章节的深入,将进一步结合正则表达式展现更为复杂且实用的文本处理技巧。 第3章:正则表达式入门与实战应用 3.1 正则表达式基本概念 3.1.1 元字符及其含义 正则表达式...
"." Matches any character except a newline. "^" Matches the start of the string. "$" Matches the end of the string or just before the newline at the end of the string. "*" Matches 0 or more (greedy) repetitions of the preceding RE. ...
x = re.split("\s",txt,1) print(x) Try it Yourself » The sub() Function Thesub()function replaces the matches with the text of your choice: Example Replace every white-space character with the number 9: importre txt ="The rain in Spain" ...
As each character comes through, the script will search for the string. Note: To make this work on both Windows and UNIX-based systems, two strings are searched for: either "==\n= " or "==\r\n= ". The Windows-style carriage return along with the typical newline is required on ...
For bytes in the printable ASCII range—from space to ~—the ASCII character itself is used. For bytes corresponding to tab, newline, carriage return, and \, the escape sequences \t, \n, \r, and \\ are used. For every other byte value, a hexadecimal escape sequence is used (e.g...