pythonfor回圈，如果不能正常作業-有解無憂

我有以下代碼，它似乎無法正常作業。

cylinderCount = [8,5,5,8]
engineCount = 4

for no in range(engineCount):
    for i in range(cylinderCount[no]):
       engineNo = str(no 1)

    if cylinderCount == 8:
       col = ["GA022" str(i)   '_0' str(engineNo) for i in range(20, cylinderCount[no]*10 11,10)]   ['GA02291' '_0' str(engineNo)]
    else:
       col = ["GA022" str(i)   '_0' str(engineNo) for i in range(20, cylinderCount[no]*10 11,10)]

col 應該是

GA02220_04,GA02230_04,GA02240_04,GA02250_04,GA02260_04,GA02270_04,GA02280_04,GA02290_04,GA02291_04

但有些我只是得到

GA02220_04,GA02230_04,GA02240_04,GA02250_04,GA02260_04,GA02270_04,GA02280_04,GA02290_04

有人可以告訴我我沒有得到 GA02291_04 嗎？

uj5u.com熱心網友回復：

您定義cylinderCount為一個串列，然后嘗試與一個數字進行比較，嘗試更改。

...
if cylinderCount == 8:
....

至

...
if cylinderCount[no] == 8:
...

uj5u.com熱心網友回復：

您的代碼示例很難消化，因為您分配col但不使用它。這與您的代碼完全相同，但隨后進行了清理并且更加干燥。小假設，因為您的縮進有點偏離。

cylinderCount = [8, 5, 5, 8]
engineCount = 4

rows = []
for engineno_int, cylinders in enumerate(cylinderCount):
    engineNo = str(engineno_int   1)

    for i in range(cylinders):

        col = [f"GA022{i}_0{engineNo}" for i in range(20, cylinders * 10   11, 10)]
        if cylinders == 8:
            col  = [f"GA02291_0{engineNo}"]
        rows.append(col)

列印而不是附加 col 結果如下：

['GA02220_01', 'GA02230_01', 'GA02240_01', 'GA02250_01', 'GA02260_01', 'GA02270_01', 'GA02280_01', 'GA02290_01', 'GA02291_01']
['GA02220_01', 'GA02230_01', 'GA02240_01', 'GA02250_01', 'GA02260_01', 'GA02270_01', 'GA02280_01', 'GA02290_01', 'GA02291_01']
['GA02220_01', 'GA02230_01', 'GA02240_01', 'GA02250_01', 'GA02260_01', 'GA02270_01', 'GA02280_01', 'GA02290_01', 'GA02291_01']
['GA02220_01', 'GA02230_01', 'GA02240_01', 'GA02250_01', 'GA02260_01', 'GA02270_01', 'GA02280_01', 'GA02290_01', 'GA02291_01']
['GA02220_01', 'GA02230_01', 'GA02240_01', 'GA02250_01', 'GA02260_01', 'GA02270_01', 'GA02280_01', 'GA02290_01', 'GA02291_01']
['GA02220_01', 'GA02230_01', 'GA02240_01', 'GA02250_01', 'GA02260_01', 'GA02270_01', 'GA02280_01', 'GA02290_01', 'GA02291_01']
['GA02220_01', 'GA02230_01', 'GA02240_01', 'GA02250_01', 'GA02260_01', 'GA02270_01', 'GA02280_01', 'GA02290_01', 'GA02291_01']
['GA02220_01', 'GA02230_01', 'GA02240_01', 'GA02250_01', 'GA02260_01', 'GA02270_01', 'GA02280_01', 'GA02290_01', 'GA02291_01']
['GA02220_02', 'GA02230_02', 'GA02240_02', 'GA02250_02', 'GA02260_02']
['GA02220_02', 'GA02230_02', 'GA02240_02', 'GA02250_02', 'GA02260_02']
['GA02220_02', 'GA02230_02', 'GA02240_02', 'GA02250_02', 'GA02260_02']
['GA02220_02', 'GA02230_02', 'GA02240_02', 'GA02250_02', 'GA02260_02']
['GA02220_02', 'GA02230_02', 'GA02240_02', 'GA02250_02', 'GA02260_02']
['GA02220_03', 'GA02230_03', 'GA02240_03', 'GA02250_03', 'GA02260_03']
['GA02220_03', 'GA02230_03', 'GA02240_03', 'GA02250_03', 'GA02260_03']
['GA02220_03', 'GA02230_03', 'GA02240_03', 'GA02250_03', 'GA02260_03']
['GA02220_03', 'GA02230_03', 'GA02240_03', 'GA02250_03', 'GA02260_03']
['GA02220_03', 'GA02230_03', 'GA02240_03', 'GA02250_03', 'GA02260_03']
['GA02220_04', 'GA02230_04', 'GA02240_04', 'GA02250_04', 'GA02260_04', 'GA02270_04', 'GA02280_04', 'GA02290_04', 'GA02291_04']
['GA02220_04', 'GA02230_04', 'GA02240_04', 'GA02250_04', 'GA02260_04', 'GA02270_04', 'GA02280_04', 'GA02290_04', 'GA02291_04']
['GA02220_04', 'GA02230_04', 'GA02240_04', 'GA02250_04', 'GA02260_04', 'GA02270_04', 'GA02280_04', 'GA02290_04', 'GA02291_04']
['GA02220_04', 'GA02230_04', 'GA02240_04', 'GA02250_04', 'GA02260_04', 'GA02270_04', 'GA02280_04', 'GA02290_04', 'GA02291_04']
['GA02220_04', 'GA02230_04', 'GA02240_04', 'GA02250_04', 'GA02260_04', 'GA02270_04', 'GA02280_04', 'GA02290_04', 'GA02291_04']
['GA02220_04', 'GA02230_04', 'GA02240_04', 'GA02250_04', 'GA02260_04', 'GA02270_04', 'GA02280_04', 'GA02290_04', 'GA02291_04']
['GA02220_04', 'GA02230_04', 'GA02240_04', 'GA02250_04', 'GA02260_04', 'GA02270_04', 'GA02280_04', 'GA02290_04', 'GA02291_04']
['GA02220_04', 'GA02230_04', 'GA02240_04', 'GA02250_04', 'GA02260_04', 'GA02270_04', 'GA02280_04', 'GA02290_04', 'GA02291_04']

uj5u.com熱心網友回復：

你cylinderCount與8. 既然cylinderCount被定義為[8,5,5,8]這永遠不會是真的。也許你的意思是cylinderCount[no]。在這種情況下，程式過于復雜，可以寫成：

cylinders = [8, 5, 5, 8]
for no, cylinder in enumerate(cylinders, start=1):
    col = [f'GA022{i}_0{no}' for i in range(20, cylinder * 10   11, 10)]
    if cylinder == 8:
        col  = [f'GA02291_0{no}']
    print(col)

結果：

['GA02220_01', 'GA02230_01', 'GA02240_01', 'GA02250_01', 'GA02260_01', 'GA02270_01', 'GA02280_01', 'GA02290_01', 'GA02291_01']
['GA02220_02', 'GA02230_02', 'GA02240_02', 'GA02250_02', 'GA02260_02']
['GA02220_03', 'GA02230_03', 'GA02240_03', 'GA02250_03', 'GA02260_03']
['GA02220_04', 'GA02230_04', 'GA02240_04', 'GA02250_04', 'GA02260_04', 'GA02270_04', 'GA02280_04', 'GA02290_04', 'GA02291_04']

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標籤：Python for循环 if 语句

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