"当索引不是从 0 开始时删除第一行"

Question

I want to drop the first row of a dataframe subset<\/code> which is a subset of the main dataframe main<\/code> . The first row of the dataframe has index = 31<\/code> , so when I try dropping the first row I get the following error:

>>> subset.drop(0, axis=1)
KeyError: '[0] not found in axis'

Answer 1

Simpliest is select all rows without first by position:

df = df.iloc[1:]

Answer 2

df = df if df.index[0] == 0 else df.iloc[1:]