Program to swap any two elements in the list using comma separator# Python program to swap element of a list # Getting list from user myList = [] length = int(input("Enter number of elements: ")) for i in range(0, length): val = int(input()) myList.append(val) print("Enter ...
通过字节码可以看到,swap1和swap2最大的区别在于,swap1中通过ROT_TWO交换栈顶的两个元素实现x和y值的互换,swap2中引入了tmp变量,多了一次LOAD_FAST, STORE_FAST的操作。执行一个ROT_TWO指令比执行一个LOAD_FAST+STORE_FAST的指令快,这也是为什么swap1比swap2性能更好的原因。编辑...
# Now look how easy it is to swap two values e, d = d, e # d is now 5 and e is now 4 解释一下这行代码: a, *b, c = (1, 2, 3, 4) # a is now 1, b is now [2, 3] and c is now 4 我们在b的前面加上了星号,表示这是一个list。所以Python会在将其他变量对应上值的...
Swap Two Values Using a Temporary Variable in Python In this method, a temporary variable is used to swap two values. Consider two variables,aandband a temporary variable,temp. First, the value ofawill be copied totemp. Then the value ofbwill be assigned toa. Lastly, the value oftempwill...
pow_ab=a**b print(pow_ab) return pow_ab pow_ba=b**a print(pow_ba) return pow_ba 9、无处不在的帮助 你做的很棒,这三行代码让我们可以去看了在sys下被定义了的exit函数的形式和作用说明、一个字符串( str )下被定义了的split函数的形式和作用说明、以及list下所有的被定义的函数方法的列表。
last_element=my_list[-1]#pop方法 last_element=my_list.pop() 输出: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 'pineapple' 6、列表推导式 列表推导式是for循环的简易形式,可以在一行代码里创建一个新列表,同时能通过if语句进行判断筛选 ...
Again, the number of elements in the tuple on the left of the assignment must equal the number on the right. Otherwise, you get an error.Tuple assignment allows for a curious bit of idiomatic Python. Sometimes, when programming, you have two variables whose values you need to swap. In ...
>>> # Swap two variables >>> a, b = b, a >>> print(f'a is {a}; b is {b}')a is 5; b is 8 >>> # Swap the first and last elements in a list >>> numbers = [1, 2, 3, 4, 5]>>> numbers[0], numbers[-1] = numbers[-1], numbers[0]>>> numbers [5, 2, 3...
DataFrame.mask(cond[, other, inplace, …]) #Return an object of same shape as self and whose corresponding entries are from self where cond is False and otherwise are from other. DataFrame.query(expr[, inplace]) #Query the columns of a frame with a boolean expression. ...
item_two + \ item_three 上面表达式中,反斜杠(\)符号的作用是【 续行 】 48. 如果要关闭Python解释器,可以使用【 exit() 】命令 49. 如果语句太长,在Python中可以使用【 \ 】作为续行符 50. 如何查看内置模块sys帮助【 help('sys') 】 51. 用户编写的Python程序(避免使用依赖于系统的特性),无须修改...