五、循环结构
1.while
count = 0
while count < 5:
print("hello world")
count += 1 # count = count + 1
2.for
for i in range(5):
print(i)
扫描二维码关注公众号,回复:
397690 查看本文章
else:
print("结束执行....")
# range(end): 0~end-1
# range(start, end): start~end-1
# range(start, end, step): start~end-1, 步长为step
# range(1,10,2) # 1, 1+2, 1+2+2,
3. 跳出循环
break:跳出循环continue:跳过本次循环
#continue和break的区别
4.死循环
1)while True:
2)while 0<1:
3)while 1:
# if和while后面必须跟的是bool类型, 如果不是布尔类型,转化为bool类型# print(bool("hello")) # True
# print(bool("")) # False
例题: