names=['xiaozhan','caiyilin','zhoushen','DAOlang','huangxiaoming']
for name in names:
    if name == 'caiyilin':   #注意：雙等號'=='解讀為“變量name的值是否為'caiyilin' 
        print(name.upper())
    else:
        print(name.title())

my_fav_name = 'daolang'
for name in names:
    if name == my_fav_name:
        print('Yes')
    print('No')    
print('\n')
  
for name in names:
    if name.lower() == my_fav_name:
        print('Yes')
    print('No')       
print('\n')
#下方使用  if……else語句  
for name in names:
    if name.lower() != my_fav_name:   #檢查是否不相等
        print('NO')
    else:
        print('YES') 

ages=['73','12','60','1','10','55','13']
for age in ages:
    if   age > str(60):  #注意：ages中為列表字符串，所以age也是字符串，無法與整型的數(shù)字相比，需要先將數(shù)字轉(zhuǎn)化為字符串再比較。
        print("The "+str(age)+" years has retired!")
    elif age > str(18) and age<=str(60):    #兩個(gè)條件都為True時(shí)
        print("The "+str(age)+" years is an Adult!")
    elif age > str(12):
        print("The "+str(age)+" years is a student!")
    else:
        print("The "+str(age)+" years is a child!")

current_number = 1
while current_number <= 5:
    print(current_number)
    current_number += 1
print("\n")
print(current_number)

prompt = "\nTell me your secret, and I will repeat it back to you:"
prompt += "\nEnter 'quit' to end the program. "

active = True  #定義一個(gè)標(biāo)志
while active:  #當(dāng)active為真的時(shí)候，執(zhí)行程序，
    message = input(prompt) 
    if message == 'quit': #當(dāng)輸入信息為quit時(shí)，標(biāo)志active為False，程序停止
        active = False
    else:
        print(message)

prompt = "\nPlease enter the name of a city you have visited:"
prompt += "\n(Enter 'quit' when you are finished.) "

while True:
    city = input(prompt)
    if city == 'quit':
        break
    else:
        print("I'd love to go to " + city.title() + "!")

current_number = 0
while current_number < 10:
    current_number += 1  #以1逐步增加
    if current_number % 2 == 0: #求模運(yùn)行，是2的倍數(shù)，為0
        continue  #忽略并繼續(xù)運(yùn)行。
    print(current_number) #打印出數(shù)字

unconfirmed_users = ['Lucy', 'Bush', 'lincon', 'lucy',
                     'jack', 'lily', 'lucy', 'hanmeimei']  # 首先，創(chuàng)建一個(gè)待驗(yàn)證用戶列表
confirmed_users = []  # 創(chuàng)建一個(gè)用于存儲(chǔ)已驗(yàn)證用戶的空列表

while unconfirmed_users:  # 驗(yàn)證每個(gè)用戶，直到?jīng)]有未驗(yàn)證用戶為止
    current_user = unconfirmed_users.pop()  # 注意pop()是從最后一個(gè)開始。
    print("Verifying user: " + current_user.title())  # 打印驗(yàn)證的用戶，且首字母大寫
    confirmed_users.append(current_user)  # 將每個(gè)經(jīng)過驗(yàn)證的列表都移到已驗(yàn)證用戶列表中，
    # 相當(dāng)于將unconfirmed_users倒序保存到current_user中
print("\nThe following users have been confirmed:")  # 顯示所有已驗(yàn)證的用戶
for confirmed_user in confirmed_users:  # for循環(huán)打印每個(gè)已驗(yàn)證的用戶名
    print(confirmed_user.title())
print("\n")
# 刪除包含特定的所有列表元素
while 'lucy' in confirmed_users:  # while 循環(huán)，因?yàn)閘ucy在列表中至少出現(xiàn)了一次
    confirmed_users.remove('lucy')  # 刪除除最后一個(gè)外的其他相同的元素
print(confirmed_users)

responses = {}#定義一個(gè)空字典
polling_active = True # 設(shè)置一個(gè)標(biāo)志，指出調(diào)查是否繼續(xù)
while polling_active:
    name = input("\nWhat is your name? ")  # 提示輸入被調(diào)查者的名字和回答
    response = input("Which mountain would you like to climb someday? ")
    responses[name] = response # 將答卷存儲(chǔ)在字典中，即name是key,變量response 是值
    repeat = input("Would you like to let another person respond? (yes/ no) ")# 看看是否還有人要參與調(diào)查
    if repeat == 'no':  #如無人參與調(diào)查，將標(biāo)志設(shè)置為False,退出運(yùn)行。
        polling_active = False
# 調(diào)查結(jié)束，顯示結(jié)果
print("\n--- Poll Results ---")
print(responses)  #把字典打印出來  
for name, response in responses.items():  #訪問字典
    print(name.title() + " would like to climb " + response + ".")