在 For 循环中迭代以检查前一个值是否大于当前值
pitch_per_ab = []
pitch_of_pa = pitcher['PitchofPA']
for i in range(len(pitch_of_pa)):
prev_elem = pitch_of_pa[i-1]
current_elem = pitch_of_pa[i]
if current_elem <= prev_elem:
np.append(pitch_per_ab, prev_elem)
pitch_per_ab
这是我当前的代码，当我运行它时，我得到一个 KeyError，只显示“-1”： 错误照片
理想情况下，如果pitch_of_pa中的先前值大于当前值，它将运行，而不是将先前的值附加到列表pitch_per_ab
pitch_per_ab = []
pitch_of_pa = pitcher['PitchofPA']
for i in range(len(pitch_of_pa)):
prev_elem = pitch_of_pa[i-1]
current_elem = pitch_of_pa[i]
if current_elem <= prev_elem:
np.append(pitch_per_ab, prev_elem)
pitch_per_ab
This is my current code, when I run it i get a KeyError that simply says "-1":
photo of error
Ideally, it would run and if the previous value in pitch_of_pa is greater than the current, than it will append the previous value to the list pitch_per_ab
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发生这种情况的原因是：
i从0开始，执行此行时，值-1会导致错误：This is happens due to:
istarts in0and when this row is executed, the value-1causes the error: