'、'ABC'、"what is your name?",都是构造字符串的方法。 'string"在Python中不是一个合法的字符串。 单引号''和双引号""可以自由互换,Python并无区分。 我们也可以使用三引号'''或"""来创建多行字符串: name='John'message="Hello World"paragraph="""这是一个多行字符串的示例可以跨多行显示非常适合...
同时遍历两个或更多的序列,可以使用zip()组合: questions = ['name', 'quest', 'favorite color'] answers = ['lancelot', 'the holy grail', 'blue'] for q, a in zip(questions, answers): print('What is your {0}? It is {1}.'.format(q, a)) 要反向遍历一个序列,首先指定这个序列,然后...
Beijing is a beautiful city! 5.4 格式化输出(print(f"string={}")) 在Python 中,print(f"string={}") 是一种用于格式化字符串的语法结构。其中,“string”表示字符串;“f”前缀表示这是一个格式化字符串;“{}”是占位符,用于指示将要插入该位置的变量。注意:“f”后面一定要紧跟字符串,不能隔有空格,否...
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Example Check if an object is an integer or not: x =200 print(isinstance(x,int)) Try it Yourself » Exercise? What will be the result of the following syntax: print(5 > 3)? True False 5 > 3 Submit Answer »
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from_what值为0时表示文件的开始,它也可以省略,缺省是0即文件开头。 1 2 3 4 5 6 7 8 f = open('/tmp/workfile', 'r+') f.write('0123456789abcdef') f.seek(5) # Go to the 6th byte in the file f.read(1) '5' f.seek (-3, 2) # Go to the 3rd byte before the end f....
set1 = {"abc",34,True,40,"male"} Try it Yourself » type() From Python's perspective, sets are defined as objects with the data type 'set': <class 'set'> Example What is the data type of a set? myset = {"apple","banana","cherry"} ...
'What Is Your Name?' >>> s.swapcase() 'wHAT IS yOUR nAME?' 1. 2. 3. 4. 5. 6. 7. 8. 2、映射转换函数maketrans和translate 这两个函数一起确实是非常方便了,可以将字符串的一些字母按一一对应关系转换(所以字符数目要相同)。但在Python2和Python3中略有不同 ...
'wHAT IS yOUR nAME?' 1. raplace(), marketrans(), translate() 单次, 多次 查找替换 s="中国, 中国" s.replace('中国','中华人民共和国') 1. 2. 3. '中华人民共和国, 中华人民共和国' 1. print('abcdabc'.replace('abc','ABC'))# 一键替换,很厉害 ...