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Please help solve this error using the data.history function

Hello,

I am new to using python and zipline and am trying to get stock data using the data.history function but am getting a NameError for some reason I cannot figure out. I am sure I missed some step somewhere and would appreciate any help to on how to solve this. Here is the code snippet I am using:

from zipline import run_algorithm  
from zipline.api import order_target_percent, symbol

def initialize(context):  
    context.stock = symbol('AAPL')  
    context.index_average_window = 100

def handle_data(context,data):  
    equities_hist = data.history(context.stock, "close",  
                                 context.index_average_window,"1d")

equities_hist  

When I run 'equities_hist' I get the message: "NameError: name 'equities_hist' is not defined".

Appreciate any guidance on what I'm doing wrong.

Thanks!