布爾不停止的情況，即使設定爲假

Question

對於此代碼：

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) 

我得到如下結果：

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 ! 

我不明白爲什麼PROGRAMM看到X。 all_crop_parameters_match_the_PRA_ones爲False，仍然運行下一個功能，而不是斷開循環並切換到下一個裁剪。

x是一個包含我使用和修改的所有變量的類，它是我的代碼的幾個函數。它可能是一個錯誤，因爲布爾來自一個類？

Answer 1

您發佈的內容與我預期的行爲類似。 while循環將會重新評估，只有當它執行它裏面的所有代碼的條件...

如果你想同時代碼在中路突破，嘗試把遊：

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) 

請注意，這是在時間x.all_crop_parameters_match_the_PRA_ones == True的時間內進行循環。如果你想只執行一次內部while的代碼，而不是在一個循環中，你可以試試：

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)