Simple quantopian polyfill to allow recording metrics into dataframe

recorder.py

from zipline.api import (
    schedule_function, date_rules, time_rules, sid, symbol, 
    set_slippage, slippage, set_commission, commission,
    get_datetime, order_target_percent, 
    # record, # Replaced below
    attach_pipeline, 
    order_target, get_open_orders, history
    )


RECORD_DF = pd.DataFrame([])
def record(simulate_datetime=None, **kwargs):
    """
    Use this as a replacement of the record zipline.api
    
    :param simulated_datetime: Use set datetime instead of the algorithm datetime
    """
    global RECORD_DF
    current_date = simulate_datetime or get_datetime()
    for k,v in kwargs.items():
        RECORD_DF.set_value(current_date, k, v)
    return RECORD_DF