Python学习第四篇——列表访问与判定

 avilable_foods=["soup","beaf","noddle","pepper"]
 request_foods=["soup","rice","beaf","suggar"]
 for request_food in request_foods:
     if request_food in avilable_foods:
         print("adding "+request_food+".")
     else:
         print("sorry,we don't support for "+request_food+".")
 print("finish your food.")
 print("\n")

 customer_list=["lin","kakaxi","daitu","admin","sasik"]
 customer_list=[]
 if customer_list:
     for customer in customer_list:
         if customer =="admin":
             print("hello admin,welcome!")
         else:
             print("hello,"+customer+" thank you for logging")
 else:
     print("we need to find some users.")

 current_users=["jack","wang","robot","li","mole"]
 new_users=["zhao","mile","JACK","robot"]
 for new_user in new_users:
     if new_user.lower() in current_users:
         print("the name "+new_user+" is current occpuied")
     else:
         print("welcome to github!")
 print("\n")
 nums = [1,2,3,4,5,6,7,8,9]
 for num  in nums:
     if num == 1:
         print("1st")
     elif num == 2:
         print("2nd")
     elif num == 3:
         print("3rd")
     else:
         print(str(num)+"th")

上述代码为Python中的列表访问练习代码，旨在领会Python中的for循环的便捷之处