Python 列表推導式(List Comprehension)中 if 的位置差異; if 放在後面 (過濾條件) ; if 放在前面 (三元運算符)

['Name',
 'Layer Name for DDR',
 'Impedance (Ohms) 1 for DDR',
 'IL (dB) 1 for DDR',
 'Impedance (Ohms) 2 for DDR',
 'IL (dB) 2 for DDR',
 'Impedance (Ohms) 3 for DDR',
 'IL (dB) 3 for DDR',
 'Impedance (Ohms) 4 for DDR',
 'IL (dB) 4 for DDR',
 'Total Area (sq mils) for DDR',
 'Line Width 1 (mils) for DDR',
 'Length at Width 1 (mils) for DDR',
 'Line Width 2 (mils) for DDR',
 'Length at Width 2 (mils) for DDR',
 'Line Width 3 (mils) for DDR',
 'Length at Width 3 (mils) for DDR',
 'Line Width 4 (mils) for DDR',
 'Length at Width 4 (mils) for DDR',
 'Name',
 'Layer Name',
 'Total Area (sq mils)',
 'Line Width 1 (mils)',
 'Length at Width 1 (mils)',
 'Line Width 2 (mils)',
 'Length at Width 2 (mils)',
 'Line Width 3 (mils)',
 'Length at Width 3 (mils)',
 'Line Width 4 (mils)',
 'Length at Width 4 (mils)',
 'Line Width 5 (mils)',
 'Length at Width 5 (mils)',
 'Line Width 6 (mils)',
 'Length at Width 6 (mils)',
 'Line Width 7 (mils)',
 'Length at Width 7 (mils)',
 'Line Width 8 (mils)',
 'Length at Width 8 (mils)',
 'Name',
 'Total Vias',
 'Via Names',
 'Via1 FHS(mils)',
 'Via2 FHS(mils)',
 'Name',
 'Tab Number',
 'Name',
 'VIA Length',
 'Via length 1 (mils)',
 'Via length 2 (mils)',
 'Board thickness',
 'Via stub 1 (mils)',
 'Via stub 2 (mils)']

[print(col) for col in subsetX if subsetX.count(col) >= 2]

[表達式 for 變量 in 可迭代對象 if 條件]

[表達式A if 條件 else 表達式B for 變量 in 可迭代對象]
[print(col) if subsetX.count(col) >= 2 else print(f"{col} 只出現一次") for col in subsetX]

for col in subsetX:
    if subsetX.count(col) >= 2:
        print(col)

for col in set(subsetX):
    if subsetX.count(col) >= 2:
        print(f"{col} appears {subsetX.count(col)} times")