循环和条件分支

条件分支语句,if elif else 代码如下:

# -*- coding: utf-8 -*-
#条件判断
age = int(input('please your age'))
if age < 3:
    print('you are baby')
elif age < 9:
    print('you are child')
elif age < 19:
    print('you are adole')
elif age < 29:
    print('you are adult')
elif age < 49:
    print('you are middle')
else:
    print('you are old')

循环
1 for in 循环

# 循环
# for in 循环
arr = [1, 2, 3, 4, 5]
for v in arr:
    print(v)

arr = range(10) #生成0-9的整数序列
arr = list(arr) #将序列转换成数组
print(arr)

sum = 0
for v in arr:
    sum += v
print(sum)

# while循环
sum = 0
n = 99
while n > 0:
    sum = sum + n
    n = n -2
print(sum)

break 和 continue

#break 用于跳出循环
n = 1
while n <= 100:
    if n > 10:
        break
    print(n)
    n = n + 1
print('end')

#continue 
n = 1
while n < 10:
    n = n + 1
    if n % 2 == 0:
        continue
    print(n)