【Python简要笔记4】if控制笔记

布尔比较，比较后返回bool值，包含：

==
>=
<=
!=
---ans---
True   
False

其中python检查是否相等时不考虑大小写。

• 使用and检查多个条件
• 使用or检查多个条件

age_0 = 6
if (age_0 >= 1) and (age_0 <= 10):
	print("Right")
if (age_0 >= 10) or (age_0 <= 5):
	print("Right")
else:
	print("Notin")
---ans---
Right
Notin

toppings = ['mushrooms', 'onions', 'pineapple']
if 'onions' in toppings:
	print("onions is there")
if 'apple' not in toppings:
	print("apple is not there")
---ans---
onions is there
apple is not there

toppings = ['mushrooms', 'onions', 'pineapple']
fruits = ['mushrooms', 'onions', 'pineapple']
if fruits:
	print("full")
else:
	print("is null")
---ans---
full

if booleanExpression:
	# some statements

if booleanExpression:
	# some statements
else:
	# some statements

if booleanExpression:
	# some statements
elif booleanExpression:
	# some statements
else:
	# some statements