有効なユーザー入力をリストと比較してエラーメッセージを返す

Question

ユーザーが2つのフットボールチームに入力するプログラムを作成しようとしています。チームは平等ではありません。私が持っている問題は、私のプログラムが自分のエラーメッセージを何度も書き込むということです（毎回リスト内で見つからない）。コードを完全に書き直すことなくこれを回避する方法はありますか？

teamlist = ["arsenal", "liverpool", "manchester", "newcastle"] 

def finding_team(home_or_away): 
    while True: 
     user_input = input("Type in " + home_or_away + " team: ") 
     for team in teamlist: 
      if team.upper() == user_input.upper(): 
       return team 
      else: 
       print("Didn't get that, try again") 
       continue 
def team_input(): 
    print() 
    hometeam = finding_team("HOME") 
    awayteam = finding_team("AWAY") 
    while hometeam == awayteam: 
     print("The away team can't be the same as the home team!") 
     awayteam = finding_team("AWAY") 
    return(hometeam, awayteam) 


the_teams = team_input() 
print("The teams you typed in are ", the_teams) 

Answer 1

teamlist = ["arsenal", "liverpool", "manchester", "newcastle"] 

def finding_team(home_or_away): 
    while True: 
     team = input("Type in " + home_or_away + " team: ") 
     if team.lower() in teamlist: 
      return team 
     else: 
      print("Didn't get that, try again") 

def team_input(): 
    print() 
    hometeam = finding_team("HOME") 
    awayteam = finding_team("AWAY") 
    while hometeam == awayteam: 
     print("The away team can't be the same as the home team!") 
     awayteam = finding_team("AWAY") 
    return(hometeam, awayteam) 

the_teams = team_input() 
print("The teams you typed in are ", the_teams) 

（teamに格納されている）、ユーザの入力は、単一の条件文でteamlist内のすべての項目に対してチェックされるように、私はそれを変更しました。

Type in HOME team: foo 
Didn't get that, try again 
Type in HOME team: arsenal 
Type in AWAY team: arsenal 
The away team can't be the same as the home team! 
Type in AWAY team: manchester 
The teams you typed in are ('arsenal', 'manchester') 
>>> 

Answer 2

あなたのチームがteamlisteであるかどうかを確認するだけであれば、forループは必要ありません。

teamlist = ["arsenal", "liverpool", "manchester", "newcastle"] 

def finding_team(home_or_away): 
    while True: 
     user_input = input("Type in " + home_or_away + " team: ") 
     if user_input.lower() in teamlist: 
      return user_input.upper() 
     else: 
      print("Didn't get that, try again") 

def team_input(): 
    print() 
    hometeam = finding_team("HOME") 
    awayteam = finding_team("AWAY") 
    while hometeam == awayteam: 
     print("The away team can't be the same as the home team!") 
     awayteam = finding_team("AWAY") 
    return(hometeam, awayteam) 


the_teams = team_input() 
print("The teams you typed in are ", the_teams)