示例20-2. flags.py:顺序下载脚本;一些函数将被其他脚本重用 代码语言:javascript 代码运行次数:0 运行 AI代码解释 importtime from pathlibimportPath from typingimportCallableimporthttpx # ①POP20_CC=('CN IN US ID BR PK NG BD RU JP ''MX PH VN ET EG DE IR TR CD FR').split()# ②BASE_URL...
要将消息字符串分割成子字符串,我们可以使用名为split()的 Python 字符串方法,该方法通过查找字符之间的空格来检查每个单词的开始和结束位置。(第 150 页上的split()方法对此有更详细的介绍。)然后,我们可以使用if语句将每个子串与字典中的每个单词进行比较,如下面的代码所示: 代码语言:javascript 复制 if word ==...
示例20-2. flags.py:顺序下载脚本;一些函数将被其他脚本重用 importtimefrompathlibimportPathfromtypingimportCallableimporthttpx# ①POP20_CC = ('CN IN US ID BR PK NG BD RU JP ''MX PH VN ET EG DE IR TR CD FR').split()# ②BASE_URL ='https://www.fluentpython.com/data/flags'# ③DEST...
Example 2: Python 1 2 3 4 # Summing up the ASCII values of characters in a string course = "AI" print(sum(ord(char) for char in course)) Output: Explanation: Here, sum() calculates the total ASCII value of all characters in the string. round() Function in Python The round() ...
The split() function divides a typical command into the different tokens needed. The shlex module can come in handy when it may be not obvious how to divide up more complex commands that have special characters, like spaces:Python >>> shlex.split("echo 'Hello, World!'") ['echo', '...
UnicodeEncodeError:'ascii'codec can't encode characters in position 0-1: ordinal not in range(128) 需要注意的是,我们可以将str转换成任意编码的bytes。但是在转换含有中文的str时,不能转换成ascii编码的bytes。含有中文的str无法用ASCII编码,因为中文编码的范围超过了ASCII编码的范围,Python会报错。反过来,如果我...
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" ...
words = line.split() for word in words: if word not in counts: counts[word] = 1 else: counts[word] += 1 print(counts) # Code: https://www.py4e.com/code3/count2.py Part of learning the “Art of Python” or “Thinking Pythonically” is realizing that Python often has built-in...
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=test[1:]print...
split(' ')) # ['Python', 'is', 'very', 'good'] # 按空格分割成2个子字符串 print(s.split(' ', 1)) # ['Python', 'is very good'] strip: 移除字符串首尾指定的字符 默认为空格。该方法只能删除开头或是结尾的字符,不能删除中间部分的字符。