Python學習日記（四）

while語句初探

示例程式：

# -*- coding: utf-8 -*-
"""
Created on Sun Jul 28 16:35:15 2019

@author: cenxi
"""

#while語句
unconfirmed_users=['alice','brain','candace']
confirmed_users=[]

while unconfirmed_users:
    current_user=unconfirmed_users.pop()
    print("Verifying user: " + current_user)
    confirmed_users.append(current_user)
    print("\nThe following users have been confirmed: ")
    
for confirmed_user in confirmed_users:
    print(confirmed_user.title())
    
    
    
#利用while循環删除指定資料
traffic_tools=['bus','car','bicycle','bus']
print(traffic_tools)
while 'bus' in traffic_tools:
    traffic_tools.remove('bus')
    
print(traffic_tools)

'''
#使用使用者輸入填充字典
responses={}
#設定一個flag
polling_active=True

while polling_active:
    name = input('\nWhat is your name?')
    reponse = input('Which mountain would you like to climb someday?')
    responses[name] = reponse
    repeat = input('Would you like to let another person respond?(yes/no)')
    if repeat=='no':
        polling_active = False
        print('\n--- Poll results ---')
for name,response in responses.items():
    print(name+' Would like to climb '+ response +'.')
'''
    
#exercise 1
sandwich_orders=['s','w','o']
finished_sandwichs=[]
while sandwich_orders:
    sd_orders=sandwich_orders.pop()
    print('I made your '+sd_orders+' sandwich.')
    finished_sandwichs.append(sd_orders)
    
for finished_sandwich in finished_sandwichs:
    print(finished_sandwich)
   
#exercise 2
sandwich_orders=['s','w','o','w']
finished_sandwichs=[]
while sandwich_orders:
    sd_orders=sandwich_orders.pop()
    print('I made your '+sd_orders+' sandwich.')
    finished_sandwichs.append(sd_orders)
    
for finished_sandwich in finished_sandwichs:
    print(finished_sandwich)

while 'w' in finished_sandwichs:
    finished_sandwichs.remove('w')
    
print(finished_sandwichs)

#exercise 3
visit_place={}
flag=True
while flag:
    name=input('Please input your name: ')
    place=input('\nPlease input where you want to visit: ')
    visit_place[name]=place
    repeat=input('\nDo you have any other orders?(yes/no)')
    
    if repeat=='no':
        flag=False
        print('----Ending----')
        
print(visit_place)
for name in visit_place:
    print(name.title()+' wants to visit '+place.title()+'.')
           

參考

《Python程式設計從入門到實踐》埃裡克.馬瑟斯 著