Python-顏色混合分配

Question

我正在通過我上的課來學習Python。 我的一項任務要求我創建一個系統，該系統要求用戶提供2種原色，然后告訴他們將它們組合在一起會產生什么副色。 當我運行下面粘貼的代碼時，在請求第二個輸入（第二個原色）后，它再次回到起點。 我需要幫助找出我哪里出了問題。

while True:
    try:
        Primary_Colors = ["red" , "blue" , "Yellow"]
        Secondary_Colors = ["orange" , "purple" , "green"]
        print("---------------------------------------------------------------------------------------\n")
        print("Note: The colors red, blue, and yellow are known as primary colors because they cannot")
        print("be made by mixing other colors. When you mix primary colors, you get a secondary color. \n")
        print("---------------------------------------------------------------------------------------\n\n")
        primary_color1 = input("Please enter your first primary color: ")
        if primary_color1.lower() not in Primary_Colors:
            print("Please enter a valid primary color [red, blue, or yellow]. Press any key to start over.\n")
            input()
            continue
        primary_color2 = input("Please enter your second primary color: ")
        if primary_color2.lower() not in Primary_Colors:
            print("Please enter a valid primary color. Press any key to start over.")
            input()
            continue
        if primary_color1.lower() == primary_color2.lower():
            print("You have already selected this primary color. Press any key to start over.")
            input()
            continue
        print("\n------------------------------------------------------------------------------------")
        if ((primary_color1.lower() == Primary_Colors[0] and primary_color2.lower() == Primary_Colors[2]) or (primary_color1.lower() == Primary_Colors[2] and primary_color2.lower() == Primary_Colors[0])):
            secondaryColor = Secondary_Colors[0]
        elif ((primary_color1.lower() == Primary_Colors[1] and primary_color2.lower() == Primary_Colors[0]) or (primary_color1.lower() == Primary_Colors[0] and primary_color2.lower() == Primary_Colors[1])):
            secondaryColor = Secondary_Colors[1]
        elif ((primary_color1.lower() == Primary_Colors[1] and primary_color2.lower() == Primary_Colors[2]) or (primary_color1.lower() == Primary_Colors[2] and primary_color2.lower() == Primary_Colors[1])):
            secondaryColor = Secondary_Colors[2]
            print("")
            print("When you mix ({0:s}) and ({1:s}) you get ({2:s})." .format(primary_color1.capitalize(), primary_color2.capitalize(), secondaryColor.capitalize()))
            print("\n-------------------------------------------------------------------------------\n")
            break
    except ValueError:
        print("please enter a valid primary color.")
        continue

Answer 1

我不確定我是否了解您的問題。

如果我說對了，那么這些步驟應該可以解決您的問題：

1. if primary_color2.lower() not in Primary_Colors:不是if primary_color2.lower() not in Primary_Colors:嘗試if primary_color2.lower() not in Primary_Colors: while primary_color2.lower() not in Primary_Colors: 。
2. 您需要將輸入法引用到正確的變量，例如Primary_Colors = input() 。
3. 請注意，最后一個“ elif”代碼塊的標簽不正確，因此僅當第三個條件為True時，它才會輸出結果。
4. 考慮添加一個bool變量來確定該過程是否成功以及是否可以打印結果。

完整代碼：

isSuccessful = False
while True:
    try:
        Primary_Colors = ["red" , "blue" , "Yellow"]
        Secondary_Colors = ["orange" , "purple" , "green"]
        print("---------------------------------------------------------------------------------------\n")
        print("Note: The colors red, blue, and yellow are known as primary colors because they cannot")
        print("be made by mixing other colors. When you mix primary colors, you get a secondary color. \n")
        print("---------------------------------------------------------------------------------------\n\n")
        primary_color1 = input("Please enter your first primary color: ")
        while primary_color1.lower() not in Primary_Colors:
            primary_color1 = input(Please enter a valid primary color [red, blue, or yellow]. Press any key to start over.\n)

        primary_color2 = input("Please enter your second primary color: ")
        while primary_color2.lower() not in Primary_Colors:
            primary_color1 = input(Please enter a valid primary color [red, blue, or yellow]. Press any key to start over.\n)

        if primary_color1.lower() == primary_color2.lower():
            primary_color2.lower() = input("You have already selected this primary color. Press any key to start over.")

        print("\n------------------------------------------------------------------------------------")
        if ((primary_color1.lower() == Primary_Colors[0] and primary_color2.lower() == Primary_Colors[2]) or (primary_color1.lower() == Primary_Colors[2] and primary_color2.lower() == Primary_Colors[0])):
            secondaryColor = Secondary_Colors[0]
            isSuccessful = True
        elif ((primary_color1.lower() == Primary_Colors[1] and primary_color2.lower() == Primary_Colors[0]) or (primary_color1.lower() == Primary_Colors[0] and primary_color2.lower() == Primary_Colors[1])):
            secondaryColor = Secondary_Colors[1]
            isSuccessful = True
        elif ((primary_color1.lower() == Primary_Colors[1] and primary_color2.lower() == Primary_Colors[2]) or (primary_color1.lower() == Primary_Colors[2] and primary_color2.lower() == Primary_Colors[1])):
            secondaryColor = Secondary_Colors[2]
            isSuccessful = True
        if isSuccessful:
            print("")
            print("When you mix ({0:s}) and ({1:s}) you get ({2:s})." .format(primary_color1.capitalize(), primary_color2.capitalize(), secondaryColor.capitalize()))
            print("\n-------------------------------------------------------------------------------\n")
            break
    except ValueError:
        print("please enter a valid primary color.")
        continue

獎勵：您可以嘗試除任何理解之前的和，以防止主While循環。

Answer 2

取消最后一個elif之后的print語句的縮進，否則這些語句嵌套在該elif中，並且僅在該elif條件為true時才運行：

    if ((primary_color1.lower() == Primary_Colors[0] and primary_color2.lower() == Primary_Colors[2]) or (primary_color1.lower() == Primary_Colors[2] and primary_color2.lower() == Primary_Colors[0])):
        secondaryColor = Secondary_Colors[0]
    elif ((primary_color1.lower() == Primary_Colors[1] and primary_color2.lower() == Primary_Colors[0]) or (primary_color1.lower() == Primary_Colors[0] and primary_color2.lower() == Primary_Colors[1])):
        secondaryColor = Secondary_Colors[1]
    elif ((primary_color1.lower() == Primary_Colors[1] and primary_color2.lower() == Primary_Colors[2]) or (primary_color1.lower() == Primary_Colors[2] and primary_color2.lower() == Primary_Colors[1])):
        secondaryColor = Secondary_Colors[2]
    print("")
    print("When you mix ({0:s}) and ({1:s}) you get ({2:s})." .format(primary_color1.capitalize(), primary_color2.capitalize(), secondaryColor.capitalize()))
    print("\n-------------------------------------------------------------------------------\n")
    break

Answer 3

不錯的程序！ 您有兩個“主要”問題：輸入不是那么穩定（這意味着如果用戶要輸入黃色行，盡管黃色位於Primary_Colors []中，程序將無法識別它），所以我將所有字母都小寫輸入並更改了原色列表。 另一個問題是打印結果在if語句中縮進，因此不會在每次迭代中都打印出來。 您還包括了一個“中斷”，該中斷不允許打印綠色組合的結果。 這是程序的整個固定代碼：

while True:
try:
    Primary_Colors = ["red" , "blue" , "yellow"]
    Secondary_Colors = ["orange" , "purple" , "green"]
    print("---------------------------------------------------------------------------------------\n")
    print("Note: The colors red, blue, and yellow are known as primary colors because they cannot")
    print("be made by mixing other colors. When you mix primary colors, you get a secondary color. \n")
    print("---------------------------------------------------------------------------------------\n\n")
    primary_color1 = input("Please enter your first primary color: ").lower()
    if primary_color1.lower() not in Primary_Colors:
        print("Please enter a valid primary color [red, blue, or yellow]. Press any key to start over.\n")
        input()
        continue
    primary_color2 = input("Please enter your second primary color: ").lower()
    if primary_color2.lower() not in Primary_Colors:
        print("Please enter a valid primary color. Press any key to start over.")
        input()
        continue
    if primary_color1.lower() == primary_color2.lower():
        print("You have already selected this primary color. Press any key to start over.")
        input()
        continue
    print("\n------------------------------------------------------------------------------------")
    if ((primary_color1.lower() == Primary_Colors[0] and primary_color2.lower() == Primary_Colors[2]) or (primary_color1.lower() == Primary_Colors[2] and primary_color2.lower() == Primary_Colors[0])):
        secondaryColor = Secondary_Colors[0]
    elif ((primary_color1.lower() == Primary_Colors[1] and primary_color2.lower() == Primary_Colors[0]) or (primary_color1.lower() == Primary_Colors[0] and primary_color2.lower() == Primary_Colors[1])):
        secondaryColor = Secondary_Colors[1]
    elif ((primary_color1.lower() == Primary_Colors[1] and primary_color2.lower() == Primary_Colors[2]) or (primary_color1.lower() == Primary_Colors[2] and primary_color2.lower() == Primary_Colors[1])):
        secondaryColor = Secondary_Colors[2]
    print("")
    print("When you mix ({0:s}) and ({1:s}) you get ({2:s}).".format(primary_color1.capitalize(),
                                                                     primary_color2.capitalize(),
                                                                     secondaryColor.capitalize()))
    print("\n-------------------------------------------------------------------------------\n")
except ValueError:
    print("please enter a valid primary color.")
    continue

希望這對您有所幫助:)