1.用户输入
#输入
message = input("Tell me something,and I will repeat it back to you:")
print(message)
#数值输入
while True:
age = int(input("Enter ' 0 when you are finished.How old are you?"))
if age >= 18:
print("已成年！")
elif age < 18 and age >0:
print("未成年！")
continue
elif age == 0:
break
Tell me something,and I will repeat it back to you:Hi!
Hi!
Enter ' 0 when you are finished.How old are you?20
已成年！
Enter ' 0 when you are finished.How old are you?12
未成年！
Enter ' 0 when you are finished.How old are you?0
while循环
#while条件循环
current_number = 1
numbers = []
while current_number <= 5:
numbers.append(current_number)
#跳出循环的条件
current_number += 1
print(numbers)
print(current_number)
[1, 2, 3, 4, 5]
6
2.创建多行字符串、标志、break、continue
#创建多行字符串，即字符串相加
prompt = "If you tell us who you are,we can personalize the messages"
prompt += "nEnter ''quit' when you are finished.What is your first name?"
print("n第一：")
name = input(prompt)
print(f"n第一个输出：Hello,{name}!n")
#设置初始运行值
print("n第二：")
name = ""
while name != 'quit':
name = input(prompt)
#print(name)
#仅在不是quit值时打印
if name != 'quit':
print(f"n第二个输出：{name}!n")
#设置标志flag
print("n第三：")
active = True
while active:
message = input(prompt)
if message == 'quit':
active = False
else:
print(f"n第三个输出：{message}。n")
#break跳出整个循环
print("n第四：")
while True:
city = input(prompt)
if city == 'quit':
break
else:
print(f"n第四个输出：I'd love to go to {city.title()}n")
#continue跳出一次循环后返回循环开头
print("n第五：")
current_number = 0
while current_number < 10:
current_number += 1
if current_number %2 == 0:
continue
print(current_number)
第一：
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?li第一个输出：Hello,li!
第二：
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?ni第二个输出：ni!
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?hao第二个输出：hao!
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?quit
第三：
If you tell us who you are,we can personalize the messages
PS C:Userstw> & python d:/MyProgramFiles/VScode/ChapterTow.py第一：
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?li第一个输出：Hello,li!
第二：
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?ni第二个输出：ni!
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?hao第二个输出：hao!
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?quit第三：
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?ta第三个输出：ta。
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?hao第三个输出：hao。
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?quit第四：
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?dou第四个输出：I'd love to go to Dou
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?hao第四个输出：I'd love to go to Hao
If you tell us who you are,we can personalize the messages
Enter ''quit' when you are finished.What is your first name?quit第五：
1
3
5
7
9
3.列表间移动元素、删除重复出现的特定值
#在列表之间移动元素
#首先，创建一个待验证用户列表
#和一个用于存储已验证用户的空列表。
un/confirm/ied_users = ['alien','brian','candnce']
/confirm/ied_users = []
#验证每个用户，直到没有未验证用户为止。
#将每个经过验证的用户都移动到已验证用户列表中。
#列表为空即为False。
while un/confirm/ied_users:
current_user = un/confirm/ied_users.pop()
print(f"Verifying user: {current_user.title()}")
/confirm/ied_users.append(current_user)
#显示所有已验证的用户。
print("nThe following users have been /confirm/ied:")
for /confirm/ied_user in /confirm/ied_users:
print(/confirm/ied_user.title())
#删除重复出现的特定值
pets = ['dog','cat','dog','goldfish','cat','rabbit','cat']
while 'cat' in pets:
pets.remove('cat')
print(pets)
Verifying user: Candnce
Verifying user: Brian
Verifying user: Alien
The following users have been /confirm/ied:
Candnce
Brian
Alien
['dog', 'dog', 'goldfish', 'rabbit']
4.用户输入填充字典
#使用用户输入来填充字典
responses ={}
#设置一个标志，指出调查是否继续
polling_active = True
while polling_active:
#提示输入被调查者的名字和回答。
name =input("nWhat is your name?")
response = input("nWhich mountain would you like to climb someday?")
#将回答存储在字典中。
responses[name] = response
#看看是否还有人要参与调查。
respeat = input("nqWould you like to let another person respond?(y/n)")
if respeat == 'n':
polling_active = False
#调查结束，显示结果。
print("n--- Poll Results ---")
print(responses)
for name,response in responses.items():
print(f"{name} would like to climb {response}")
What is your name?Li
Which mountain would you like to climb someday?huangshan
qWould you like to let another person respond?(y/n)y
What is your name?cc
Which mountain would you like to climb someday?baishan
qWould you like to let another person respond?(y/n)n
--- Poll Results ---
{'Li': 'huangshan', 'cc': 'baishan'}
Li would like to climb huangshan
cc would like to climb baishan
