4 简单的 if 语句

#一个简单的if语句
animals = ['dog', 'cat', 'pig', 'horse']
for pet in animals:
    if pet == 'dog':
        print("My favourite animals is " + pet.upper())
    else:
        print("Not " + pet.title())
        
print("---------------------------> 多个条件的情况")
#也可以检查多个条件 ---- 用and连接
i = 5
love = 2 
you = 0
if i == 5 and love == 2 and you >= 0:
    print("I love you!")
    
#也可以用 or 做 或 判断
if i == 5 or love == 6 or you > 0:
    print("ditto.")
    
print("---------------------------> 检查特定值是否在列表中")
char = ['I', 'love', 'you', "hui"]
#在表里的情况
if 'hui' in char:
    print(char)
#不在表里的情况
if 'zong' not in char:
    print("Looking for...")
#布尔语句本质上就是If语句，其只有两种状态 True 或 Flase

number = 19
number > 18  #python可以直接给出真假的判断

#if else 和if elif else
Pass = 60
Good = 80
Excellence = 90
message = input("Please input your score:")
score = int(message)
if score >= Pass and score < 80:
    print("Luckily,you have passed!")
elif score >= Good and score <= 90:
    print("Congratulation,You got a Good in the test!")
elif score >= Excellence:
    print("NB! You got a Excellence!")
else:
    print("Fight again...")

皮一下😄

#上海理工大学2019考研---控制工程之来不来复试自测。
message = input("初试考了多少分啊？")
score = int (message)          #注意要把输入转换成int类型
if score >= 300 and score < 350:
    print("当然来复试！")
elif score < 300 and score >= 270:
    print("那也得来复试！")
elif score >= 350:
    print("滚...你不需要测试🙂")
elif score < 270:              #最后一条或者直接是else，elif必须加上条件
    print("你已经很努力了，考研不是唯一出路......")

#Pizza店 ---> 确认顾客是否要点普通Pizza(确认列表是否为空)
requested_toppings = ['mushroom', 'extra cheese', 'lemon']
ingredients = list(requested_toppings)

print("There are available ingredients: " + str(ingredients))
requested_topping = input("Please input the ingredients you want or input 0:")

if requested_topping == '0':
    print("Are you sure you want a plain Pizza?")
    message = input("Y or N ? ")
    if message == "N":
        print("Please choose again!")
    if message == "Y":
        print("Thanks for your patience!")
else:
    print("Adding " + requested_topping +".")
    print("\nFinshed your Pizza!")    

#动手试一试 ---> 输出序数
number = [1, 2, 3, 4, 5, 6, 7, 8, 9]
for ordinal in number:
    if ordinal == 1:
        print(str(ordinal) + "st")
    elif ordinal == 2:
        print(str(ordinal) + "nd")
    elif ordinal == 3:
        print(str(ordinal) + "rd")
    else:
        print(str(ordinal) + "th")

Date 2018年12月28日

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