python数据处理——dataframe删除首行并修改index

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import pandas as pd
df = pd.DataFrame(columns=['open','close'])
df = df.append({'open':1,'close':2},ignore_index=True)
df.loc[len(df)]=[5,6]
df.drop(index=0,inplace=True)
df.reset_index(drop=True,inplace=True)
print(df)