从pandas dataframe列中删除前n-1个零

import pandas as pd

df = pd.DataFrame({'A': [0, 0, 0, 1, 2, 0, 0, 3, 4, 0]})

zero_count = (df['A'] == 0).shift().cumsum()

df = df[zero_count >= 1]

import pandas as pd

df = pd.DataFrame({'A': [0, 0, 0, 1, 2, 0, 0, 3, 4, 0]})

zero_count = (df['A'] == 0).shift().cumsum()
df = df[zero_count >= 1]

print(df)