简简单单学Python

只是希望自己能够坚持学习，当个自己的学习笔记，难免有错

if语句：处理特殊情形

dimm=('a','b','c','d')
for dimm1 in dimm:

  if dimm1 == 'b':
	  print(dimm1.upper())
  else:
	  print(dimm1.lower())

a
B
c
d

if语句判断表达式时区分大小写

判断两个值是否不相等用!=

判断多个条件是否成立：and，or（类似于与门，或门）

检查特定值是否包含在列表中：'特定值' in 列表名

检查特定值是否不包含在列表中：not in 列表名：

检查超过两个以上的情形：if-elif-elif-...-elif-else：

if age<4:
	price=0
elif age<18:
	price=5
else:
	price=10
print("Your admission cost is $"+ str(price)+".")

Your admission cost is .

使用多个列表：

for requested_topping in requested_toppings:
	if requested_topping in available_toppings:
		print("Adding "+requested_topping+".")
	else:
		print("Sorry,we don't have "+requested_topping+".")
print("\nFinished making your pizza!")


Sorry,we don't have v.

Finished making your pizza!

available_toppings=['a','b','c','d']

requested_toppings=['a','b','c']

for requested_topping in requested_toppings:
	if requested_topping in available_toppings:
		print("Adding "+requested_topping+".")
	else:
		print("Sorry,we don't have "+requested_topping+".")
print("\nFinished making your pizza!")、


Adding a.
Adding b.
Adding c.

Finished making your pizza!