简单 Python 程序 - 不确定范围和循环

Question

这是我应该在 python 中创建的伪代码：

PlayerOneScore ← 0
PlayerTwoScore ← 0
OUTPUT "How many games?"
INPUT NoOfGamesInMatch
FOR NoOfGamesPlayed ← 1 TO NoOfGamesInMatch Do
    OUTPUT "Did Player One win the game (enter Y or N)?"
    INPUT PlayerOneWinsGame
    IF PlayerOneWinsGame = 'Y'
        THEN PlayerOneScore ← PlayerOneScore + 1
        ELSE PlayerTwoScore ← PlayerTwoScore + 1
    ENDIF
ENDFOR
OUTPUT PlayerOneScore
OUTPUT PlayerTwoScore

这是我在 python 中创建的，但它不起作用，我不明白为什么？

PlayerOneScore = 0
PlayerTwoSCore = 0
NoOfGamesInMatch = input("How Many games?")
for NoOfGamesPlayed != NoOfGamesInMatch:  
    PlayerOneWinsGame = input(" Did Player on win the game(Enter y or N?)")
    if PlayerOneWinsGame == "Y":
        PlayerOneScore = PlayerOneScore + 1
    else:
        PlayerTwoScore = PlayerTwoScore = 1
print("Player one Score is" + str(PlayerOneScore))
print("Player Two Score is" + str(PlayerTwoScore))

我试了in range部分，在程序输入多少游戏的时候输入一个就出现这个错误。

    for NoOfGamesPlayed in range(NoOfGamesInMatch):
TypeError: 'str' object cannot be interpreted as an integer

Answer 1

你的线路

for NoOfGamesPlayed != NoOfGamesInMatch:

无效 Python。如果你想在这里使用循环，for 很有帮助，但你需要添加一个 range() 函数：

for NoOfGamesPlayed in range(int(NoOfGamesInMatch)):

参见Python tutorial on the for construct. Since the input() function returns a string, you need to convert it to an integer first, using the int() function。

除了在 input() 行中使用小写字母 y 之外，您的代码与其他伪代码非常匹配；你可能想要更正它，因为你只在结果中测试 uppercase Y:

PlayerOneWinsGame = input("Did Player One win the game (enter Y or N?)")

您在 PlayerTwoScore 更新中还犯了一个小错字；将第二个 = 替换为 +:

PlayerTwoScore = PlayerTwoScore + 1

将它们放在一起可以得到：

PlayerOneScore = 0
PlayerTwoSCore = 0
NoOfGamesInMatch = input("How Many games?")
for NoOfGamesPlayed in range(int(NoOfGamesInMatch)):
    PlayerOneWinsGame = input("Did Player One win the game (enter Y or N?)")
    if PlayerOneWinsGame == "Y":
        PlayerOneScore = PlayerOneScore + 1
    else:
        PlayerTwoScore = PlayerTwoScore + 1
print("Player one Score is" + str(PlayerOneScore))
print("Player Two Score is" + str(PlayerTwoScore))

Answer 2

如果我猜到了你的意图，代码应该是这样的：

player_one_score = 0
player_two_score = 0

games_in_match = input("How Many games?")

for i in range(games_in_match):  
    player_one_wins = input(" Did Player One win the game(Enter Y or N?)")
    if player_one_wins.upper() == "Y":
        player_one_score += 1
    else:
        player_two_score += 1

print("Player One Score is {}".format(player_one_score))
print("Player Two Score is {}".format(player_two_score))

Answer 3

在每种语言中，for 循环更常用于遍历一个值范围，如

for record in records
for file in files
for i in range(0, 10)
for prime_number in [11, 13, 19]

另一方面，while 循环用于执行代码块而给定条件的计算结果为真

while i_am_hunger: eat()
while list_is_empty
while list_is_not_empty

以此类推

在我看来，您的案例更适合 while 循环。类似于：

while NoOfGamesPlayed != NoOfGamesInMatch:  *do something*

最后的注意事项： Python 有一些旨在使您的代码更简洁的风格指南。虽然风格有时是个人选择，但如果您花一些时间阅读它们会很好。例如，在你的情况下，你的变量名应该用下划线分隔，如 no_of_games_played。在此处查看更多内容：

Google Style Guide

PEP-8

简单 Python 程序 - 不确定范围和循环

Simple Python Program - unsure with Range and loop

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