1.函数input（）的工作原理
message = input("Tell me something,I will repeat it back to you: ") ** #input（）函数：让程序停止运行，等待用户输入一些文本** print(message) name = input("Please enter your name: ") print("Hello," + name + "!") prompt = "If you tell us who you are,we can personalize the message you see." ** #创建多行字符串，+=：再附加** prompt += "\nWhat is your first name?" name_a = input(prompt) print("Hello "+ name_a + "!") #求模运算符 number = input("Enter a number,and I will tell you if it's even or odd: ")** #使用input（）** number = int(number) #用户输入的数值是字符串表示的，转化为数值 if number % 2 == 0: print("\n The number " + str(number) + " is even.") else: print("\nThe number " + str(number) + " is odd.") print("\n")
2.使用while循环
num = 1 while num <=5: print(num) num+=1
（2）#让用户选择何时退出
prompt = "\nTell me something,I will repeat it back to you." prompt += "\nEnter 'quit' to end program. " message = "" while message != "quit": #message变量来提供判断 message = input(prompt) ** #input()都需要一个变量存储** if message != "quit": ** #打印前加个if条件再打印** print(message) #使用标志 active = True #Ture：程序处于活跃状态 while active: message = input(prompt) if message == "quit": #用if语句判断程序状态 active = False else: print(message) #使用break退出循环 while True: message = input(prompt) if message == "quit": break else: print(message)
（3）循环中使用continue
num = 0 while num <= 10: num +=1**** if num % 2 == 0: continue ** #满足条件继续循环，不满足跳出**
print(num) **#不写在循环内**
number = 1
while number >3:
print(number)
（4）#删除包含特定值的所有列表元素
pet = ["dog","dog","dog","cat","rabbit"] print(pet) while "dog" in pet: pet.remove("dog") print(pet)
3.#使用用户输入来填充字典
responses = {} #创建空字典 active = True #循环状态 while active: name = input("What is your name? " ) ** #变量做键** response = input("Where are you want to go? ") #变量做值 responses[name] = response #添加键-值 repeat = input("Would you like to let another person respond? (yes/no) ") if repeat == "no": ** #if判断状态** active = False print("\n---poll Result---") for name,response in responses.items(): #items():两个变量分别存储键-值 print(name + " would like to go " + response + ".")
