defstring_reverse(a_string): n=len(a_string) x=""foriinrange(n-1,-1,-1): x+=test[i]returnx 第六种方法:使用reduce reduce(lambdax,y : y+x, a_string) 第七种方法:使用递归(慢) defrev_string(s):iflen(s) == 1:returnsreturns[-1] + rev_string(s[:-1]) 第八种方法:使用lis...
must be a string, whose characters will be mapped to None in the result. Docstring: S.translate(table) -> str Return a copy of the string S in which each character has been mapped through the given translation table. The table must implement lookup/indexing viagetitem, for instance a dict...
Return a string which is the concatenation of the strings in the iterable. The separator between elements is S separato [ˈsepəreɪtə(r)] 分隔符 S ="我爱学习"v="".join(S)print(v) C:\python35\python3.exe D:/pyproject/day11数据类型的方法/str-way.py 我爱学习 S ="我爱学...
print是打印在控制台,而return则是将后面的部分作为返回值。” 下面再来看看return的一些特别之处。 1.可以return多个结果 代码语言:python 代码运行次数:0 运行 AI代码解释 deffunc3(a,b):res1=a+b res2=a-breturnres1,res2print(func3(4,9))返回结果:13-5 2.一个函数可以有多个return,但是只会执行第...
The index method can’t return a number because the substring isn’t there, so we get a value error instead: In order to avoid thisTraceback Error, we can use the keywordinto check if a substring is contained in a string. In the case of Loops, it was used for iteration, whereas in...
return "hello world" if __name__ == '__main__': demo(name=1, age=2) # 正常显示 demo(name='小小', age=2) # 正常显示 1. 2. 3. 4. 5. 6. 7. 8. 9. 运行结果: 函数参数注解 代码如下: def demo(name: str, age: 'int > 0' = 20) -> str: # ->str 表示该函数的返回...
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,否则会报错。 a = 1 b = 2 c = 3 print(f"b={b}, c={c}, a...
def func(i): # 判断奇数 return i % 2 == 1 lst = [1,2,3,4,5,6,7,8,9] l1 = filter(func, lst) #l1是迭代器 print(l1) #<filter object at 0x000001CE3CA98AC8> print(list(l1)) #[1, 3, 5, 7, 9] map() 会根据提供的函数对指定序列列做映射(lamda) 语法: map(function...
print(a[1]) Try it Yourself » Looping Through a String Since strings are arrays, we can loop through the characters in a string, with aforloop. Example Loop through the letters in the word "banana": forxin"banana": print(x)