if语句

# 一个简单的例子
names = ['zhangsan', 'wanger', 'lisi']
for name in names:
if name == 'lisi':
print(name.upper())
else:
print(name.title())

if-else 语句

# if-else 语句
age = 17
if age >= 18:
print("你已经成年了！")
else:
print("还没有成年!")

if-elif-else 结构

age = 12
if age < 4:
price = 0
elif age < 18:
price = 25
else:
price = 40
print(f'your admission cost is ${price}')

使用多个elif代码块

age = 18
if age < 2:
print("是小婴儿")
elif 2 <= age < 4:
print("是幼儿")
elif 4 <= age < 13:
print("儿童")
elif 13 <= age < 20:
print("青少年")
elif 20 <= age < 65:
print("成年人")
else:
print("老年人")

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