for i in range(0,5): for j in range(0,5): print(j,end=" ") print("\n") print("loop end.") 结果: 0 1 2 3 4 0 1 2 3 4 0 1 2 3 4 0 1 2 3 4 0 1 2 3 4 loop end. while循环结构 语法: while <condition>条件语句: <execute statement>执行语句 执行语句可以是单个语...
while的代码test1.py: i = 0 while i < 10000000: i += 1 for-loop的代码test2.py: for n in range(0,10000000):...pass time python test1.py 或者test2.py,得到第一个的时间大概是0m1.189s;第二个的时间是0m0.514s。...while循环的时间大概是for-range的两倍。 其实如果对python字节码的反汇...
squares.append(i ** 2) # 列表推导式 squares = [i ** 2 for i in range(10)] ``` 3.2 减少循环内部的计算 将不必要的计算移出循环,以减少循环内的开销。 ```python # 高开销操作移出循环 precomputed = complex_precomputation() for i in range(1000): result = use_precomputed(precomputed, i)...
while 判断条件: 循环体语句 1. 2. 注意:while语句以及缩进部分是一个完整的代码块 while 循环流程图 while 循环案例 打印5 遍 Hello Python In [22]: In [23]: i = 1 # 定义重复次数计数器 In [24]: while i <= 5: ...: print('Hello Python') ...: ...: # 处理计数器 i ...: i =...
in a while loop work similarly to their for loop counterparts.'else' in a while loop executes the block of code if the loop ends naturally without encountering a 'break'. 'pass' serves as a placeholder, ensuring the code structure remains intact without executing any action.
/bin/bash for loop in 1 2 3 4 5 6 do ... 802.11 0 526 python-for循环 2019-12-02 15:11 −像while循环一样,for可以完成循环的功能。 在python中for循环可以遍历任何序列的项目,如一个列表或者一个字符串等。 for循环的格式: for 临时变量 in 列表或者字符串等可迭代对象: 循环满足条件时可...
in range 循环跳过Python 忽然笑 2023-12-12 10:00:44 salary=0salaryArray=[]loop=0noYears=int(input("How many years do you want to do salaries for? "))for i in range(0,noYears): while loop==0: print() print("You can add multiple sources of income, one at a time") salaryType...
for) or when the condition becomes false (with while),#but not when the loop is terminated by a break statement.print('prime number:')forninrange(2,10):forxinrange(2,n):ifn % x ==0:print(n,'equals', x,'*', n//x)breakelse:print(n,'is a prime number')#whileprint('loop'...
所以我做了这个简单的测试C++和Python代码。Python可以工作,但是Python不工作。 原因是C++允许对for-循环块中的计数器变量I进行任意更新,但是Python不允许。在Python代码中,我试图通过在while-循环中执行i += 1来任意更新我,但是如果您查看At the first part of the ...
while ... else .. : 当while 循环正常执行完,中间没有被break 中止的话,就会执行else后面的语句 无break的例子: 1count =02whilecount <= 5:3count += 14print("Loop",count)56else:7print("循环正常执行完啦")8print("---out of while loop ---")91011#输出如下12Loop 113Loop 214Loop 315Loop...