Python-基础-循环

循环

while 循环

count=0whilecount<5:print(count,end=" ")# 0 1 2 3 4count+=1# while-else：循环正常结束（未 break）时执行 elsen=0whilen<3:print(n)n+=1else:print("循环正常结束")

for 循环

# 遍历列表fruits=["apple","banana","cherry"]forfruitinfruits:print(fruit)# 遍历字符串forcharin"Python":print(char,end=" ")# P y t h o n# for-elseforitemin[1,2,3]:ifitem==10:print("找到了")breakelse:print("未找到")# 输出：未找到

range() 函数

range(stop)# 0 到 stop-1range(start,stop)# start 到 stop-1range(start,stop,step)foriinrange(5):# 0, 1, 2, 3, 4print(i)foriinrange(2,6):# 2, 3, 4, 5print(i)foriinrange(10,0,-2):# 10, 8, 6, 4, 2print(i)# 带索引的遍历fruits=["apple","banana","cherry"]fori,fruitinenumerate(fruits):print(f"{i}:{fruit}")# 0: apple# 1: banana# 2: cherry

循环控制语句

break# 跳出整个循环continue# 跳过当前迭代，进入下一次pass# 占位符，什么都不做

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