CryptoCompare API HistoDay Python Wrapper

import datetime
import requests
import pandas as pd

def daily_price_historical(symbol, comparison_symbol, limit=0, aggregate=1, exchange='CCCAGG', print_url=False):
    """Returns a pandas.Dataframe containing OHLC daily data for the specified
    symbol

    Parameters
    ----------
        symbol : string
            currency we buy
        comparison_symbol : string
            currency we sell
        limit : int
            0 : returns all data available
            > 0 : returns last n rows
        exchange : string, optional
            exchange which we want to get the data from
        print_url : bool, default False
            prints the url that makes the call to the API

    Returns
    ----------
        df : pandas.DataFrame
            DataFrame containing OHLCV historical data
    """

    url = 'https://min-api.cryptocompare.com/data/histoday?fsym={}&tsym={}&limit={}&aggregate={}&e={}'\
            .format(symbol.upper(), comparison_symbol.upper(), limit-1, aggregate, exchange)
    if not limit:
        url += '&allData=True'
    page = requests.get(url)
    data = page.json()['Data']
    df = pd.DataFrame(data)
    df['timestamp'] = [datetime.datetime.fromtimestamp(d) for d in df.time]
    df.index = pd.to_datetime(df.timestamp)
    df = df.drop(['timestamp', 'time'], axis=1)
    df.columns = ['Close', 'High', 'Low', 'Open', 'VolumeFrom', 'VolumeTo']
    if print_url:
        print(url)
    return df