儘管Python中的循環無法正常工作

pointsToAdd = 30 
strengthPoints = 0 
healthPoints = 0 
wisdomPoints= 0 
dexterityPoints = 0 

while pointsToAdd > 0: 
    choice = int(input("Choice(1-4): ")) 
    if choice == 1: 
     pointsToAdd = int(input("How many Strength points would you like to add: ")) 
     if pointsToAdd < 31 and pointsToAdd > 0 and pointsToAdd - strengthPoints > 0: 
      strengthPoints += pointsToAdd 
      pointsToAdd -= strengthPoints 
      print("You now have",strengthPoints,"strength points") 
     elif pointsToAdd > 30: 
      print("You cannot add that many!") 
     elif pointsToAdd<1: 
      print("You cannot add less than one point!") 
     elif pointsToAdd - strengthPoints <= 0: 
      print("You only have",pointsToAdd,"points!") 
     else: 
      print("We are sorry, but an error has occurred")

我試圖讓用戶可以爲四個類別中的任何一個輸入點，但花費不超過30個點（我還沒有編寫代碼健康，智慧或敏捷點）。爲什麼當我運行程序時，如果你選擇在1-30之間添加點數，循環只能再次運行？如果用戶使用不在1-30之間的數字輸入他們想要分配給strengthPoints的點，則循環將運行關聯的if語句，但不會再次通過循環，爲什麼會出現這種情況？儘管Python中的循環無法正常工作

來源

2014-03-04 Justin

只是一點點修正:::我所知，輸入已經返回INT，無需INT（intput）（） – Pythonizer

@Streak不在python3這顯然OP寫正在使用（打印功能而不是語句）。 – Hyperboreus

您在循環

pointsToAdd = int(input("How many Strength points would you like to add: "))

測試

# Here pointsToAdd is not 30, but the value inputed by the user 
strengthPoints += pointsToAdd 
# Here strengthPoints == pointsToAdd == the value from the input 
pointsToAdd -= strengthPoints 
# Here pointsToAdd == 0

這導致pointsToAdd == 0比後做

pointsToAdd = 30

然後接着。

您需要爲您的用戶輸入使用另一個變量。

來源

2014-03-04 20:26:08 njzk2

您使用相同的變量爲兩個不同的目的pointsToAdd。您將其作爲要分配的總點數，以及用戶選擇添加到統計數據的內容。一旦您踩踏用戶選擇分配的總積分，然後將其添加到0強度並從您的用戶輸入值中減去它，並將其設置爲零。使用如下分隔變量將修復它。

totalPointsToAdd = 30 
strengthPoints = 0 
healthPoints = 0 
wisdomPoints= 0 
dexterityPoints = 0 

while totalPointsToAdd > 0: 
    choice = int(input("Choice(1-4): ")) 
    if choice == 1: 
     pointsToAdd = int(input("How many Strength points would you like to add: ")) 
    if pointsToAdd < 31 and pointsToAdd > 0 and pointsToAdd - strengthPoints > 0: 
     strengthPoints += pointsToAdd 
     totalPointsToAdd -= pointsToAdd 
     print("You now have",strengthPoints,"strength points")

來源

2014-03-04 20:24:23 cmd

正如其他人指出，你是覆蓋相同的變量pointsToAdd。我還認爲，您可以將條件降低到二：

pointsToAdd = 30 
strengthPoints = 0 

while pointsToAdd: 
    print ('You have', pointsToAdd, 'available points.') 
    choice = int(input("Choice(1-4): ")) 
    if choice == 1: 
     toBeAdded = int(input("How many Strength points would you like to add: ")) 
     if toBeAdded < 1: # Can't assign negative or null values 
      print("You cannot add less than one point!") 
      continue 
     if toBeAdded > pointsToAdd: # Don't have enough points to spend 
      print("You only have", pointsToAdd, "available points!") 
      continue 
     strengthPoints += toBeAdded 
     pointsToAdd -= toBeAdded 
     print("You now have", strengthPoints, "strength points")

來源

2014-03-04 20:30:32 Hyperboreus

-1

在Python 2.x的使用：的raw_input在Python 3.x的使用：輸入

如果你想要的Python 2.x的之間的兼容性和3.x，你可以使用：

try: 
    input = raw_input 
except NameError: 
    pass

來源

2014-03-04 20:56:05 yograterol

儘管Python中的循環無法正常工作

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