import pandas as pd


def resample_ohlc(df, period):
    output = pd.DataFrame()
    output["open"] = df.open.resample(period).first()
    output["high"] = df.high.resample(period).max()
    output["low"] = df.low.resample(period).min()
    output["close"] = df.close.resample(period).last()
    return output