即使设置为Fals，布尔值也不会停止条件

Question

对于此代码：

for crop in database:
    print("The current crop is :", crop)
    x.all_crop_parameters_match_the_PRA_ones = True     

    while x.all_crop_parameters_match_the_PRA_ones :

        ASSESS_Tmin( crop, x, PRA)

        print("x.all_crop_parameters_match_the_PRA_ones = ",  x.all_crop_parameters_match_the_PRA_ones)

        ASSESS_Water( crop, PRA, x)

        print("x.all_crop_parameters_match_the_PRA_ones = ",  x.all_crop_parameters_match_the_PRA_ones)

        ASSESS_pH(crop, PRA, x)

我得到以下结果：

The current crop is : FBRflx
Checking minimum Temperatures...
x.all_crop_parameters_match_the_PRA_ones =  False

Checking the Water Resources...
Verifying if the Water Resources match with the Tmin supported by the crop...
x.all_crop_parameters_match_the_PRA_ones =  False

The soil pH of this PRA matches to the crop requirements.
This crop is edible for the current PRA !

我不明白为什么程序看到x.all\u crop\u parameters\u match\u the \u PRA\u one是假的，并且仍然运行下一个函数，而不是中断循环并切换到下一个裁剪。你知道吗

x是一个包含我使用的所有变量的类，修改的是代码中的几个函数。这可能是一个错误，因为布尔值来自一个类吗？你知道吗

Answer 1

你贴出来的样子和我期望的一样。while循环只有在执行其中的所有代码时才会重新评估条件。。。你知道吗

如果希望while代码在中间中断，请尝试设置中断：

for crop in database:
    print("The current crop is :", crop)
    x.all_crop_parameters_match_the_PRA_ones = True     

    while x.all_crop_parameters_match_the_PRA_ones :

        ASSESS_Tmin( crop, x, PRA)

        print("x.all_crop_parameters_match_the_PRA_ones = ",  x.all_crop_parameters_match_the_PRA_ones)

        if not x.all_crop_parameters_match_the_PRA_ones:
            break

        ASSESS_Water( crop, PRA, x)

        print("x.all_crop_parameters_match_the_PRA_ones = ",  x.all_crop_parameters_match_the_PRA_ones)

        if not x.all_crop_parameters_match_the_PRA_ones:
            break

        ASSESS_pH(crop, PRA, x)

请注意，它将在时间x.all_crop_parameters_match_the_PRA_ones == True的循环中。如果只想在while内执行一次代码，而不是在循环中执行，可以尝试：

for crop in database:
    print("The current crop is :", crop)
    x.all_crop_parameters_match_the_PRA_ones = True     

    ASSESS_Tmin( crop, x, PRA)

    print("x.all_crop_parameters_match_the_PRA_ones = ",  x.all_crop_parameters_match_the_PRA_ones)

    if not x.all_crop_parameters_match_the_PRA_ones:
        continue

    ASSESS_Water( crop, PRA, x)

    print("x.all_crop_parameters_match_the_PRA_ones = ",  x.all_crop_parameters_match_the_PRA_ones)

    if not x.all_crop_parameters_match_the_PRA_ones:
        continue 

    ASSESS_pH(crop, PRA, x)