Day04.md

1. if

# 通过缩进进行分段 掌握if else 和 elif
age = 3
if age >= 18:
    print('adult')
elif age >= 6:
    print('teenager')
else:
    print('kid')

>>>kid

2. 循环

• for循环的基本用法
• while循环的基本用法
• break
• continue

# for...in ... 把列表或者元组中的元素迭代出来
names = ['sb','zz','ni']
for name in names:
    print(name)

>>>
sb
zz
ni

# 使用range函数，range(5)表示0-4
for x in range(5):
    print(x)

>>>0 1 2 3 4

# while循环的基本用法
# 计算1-10的和
sum = 0
n = 1
while n<=10:
    sum = sum + n
    n = n + 1
print(sum)

>>>55

# break直接跳出循环
sum = 0
n = 1
while n<=100:
    if n>10:
        break
    sum = sum + n
    n = n + 1
print(sum)

>>>55

# continue 跳过循环中的本次
n = 0
while n<5:
    n = n + 1
    if n==3:
        continue
    print(n)

>>>1 2 4 5