在代码中，scoreboard在开始时被设置为'You: 0 \nComp: 0'。当包含的变量发生变化时，它不会自动更新。要更新scoreboard，你应该在循环中移动F-String（并且只移动F-String）：

import random
def rps():
    user_score = 0 
    comp_score = 0
    while user_score < 3 or comp_score < 3:
        choice = ['r', 'p', 's']
        user = input('Choose [r] [p] or [s]: ')
        user = user.lower()
        comp = random.choice(choice)
        outcome = f"You chose {user} and I chose {comp}"
        if user == comp:
            print(outcome, 'Tie Game')
        elif user == 'r' and comp == choice[2] or user == 'p' and comp == choice[0] or user == 's' and comp == choice[1]:
            user_score += 1
            print(outcome, '\nYou win!')
        else:
            comp_score += 1 
            print(outcome, '\nI win')
        scoreboard = f'You: {user_score} \nComp: {comp_score}'
        print(scoreboard)
    print(scoreboard)

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这稍微改变了打印的顺序，因为我想避免复制F字符串。您可以将scoreboard = ...和print放入一个函数，比如print_scoreboard，然后调用它来恢复打印的顺序。

分数不会更新，因为记分板是在函数中定义的。有很多方法可以解决这个问题，一种方法是定义你自己的函数来更新记分板，如下所示：

import random

def updateScoreBoard(userScore, cpuScore):
    scoreboard= f'You: {userScore} \nComp: {cpuScore} '
    print(f'You: {userScore} \nComp: {cpuScore}')
    #print(f'testing the value of userScore: {userScore}')
    #print(f'testing the value of cpuScore: {cpuScore}')
    
def rps():
    user_score = 0 
    comp_score = 0
    scoreboard = f'You: {user_score} \nComp: {comp_score}'
    while user_score < 3 and comp_score < 3:
        choice = ['r', 'p', 's']
        user = input('Choose [r] [p] or [s]: ')
        user = user.lower()
        comp = random.choice(choice)
        outcome = f"You chose {user} and I chose {comp}"
        if user == comp:
            #print(scoreboard)
            print(outcome)
            print('Tie Game')
            updateScoreBoard(user_score,comp_score)
            
        elif user == 'r' and comp == choice[2] or user == 'p' and comp == choice[0] or user == 's' and comp == choice[1]:
            user_score += 1
            #print(scoreboard)
            print(outcome, '\nYou win!')
            updateScoreBoard(user_score,comp_score)
            
        else:
            comp_score += 1 
            #print(scoreboard)
            print(outcome, '\nI win')
            updateScoreBoard(user_score,comp_score)
            
    print(scoreboard)
    
rps()

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就我个人而言，我会把scoreboard、user_score和comp_score这些变量都放在def之外，然后把变量传递到函数中。然而，我提供的示例与您编写它的风格一致。