There is no python or built-in method called. query. That is what's causing the error. Fundamentals.market_cap is BoundColumn and is used to define a pipeline. There is information on how to set up and use pipelines in the documentation (https://www.quantopian.com/docs/user-guide/tools/pipeline).

What is it that you are trying to do? Perhaps attach a notebook or algo to your reply.

I want to grab the market_cap information of stock. Below is my code, thank you so much!

Market Cap

my_query = query(fundamentals.valuation.market_cap)

my_funds = get_fundamentals(my_query,'2017-01-01')

my_funds.info()

Basically just returns the market cap of everything

for 2017-01-01

my_funds.head()

The get_fundamentals and associated query method have been deprecated. The current approach to fetch data is to use 'pipeline'. So, to get the market cap one would do something like this

# Imports for pipeline  
from quantopian.pipeline import Pipeline  
from quantopian.research import run_pipeline

# Import any required datasets  
from quantopian.pipeline.data.morningstar import Fundamentals

# Import any required built in filters and factors  
from quantopian.pipeline.filters import StaticAssets, QTradableStocksUS

# Function to create a pipeline definition  
def make_pipeline():  
    # create a filter for the universe of stocks one wants to look at  
    universe = QTradableStocksUS()  

    # Define factors or data we want  
    market_cap = Fundamentals.market_cap.latest

    return Pipeline(columns={ "market_cap": market_cap}, screen = universe) 

# Run the pipeline over desired days  
result = run_pipeline(make_pipeline(), '2017-01-01', '2017-02-01')  
# Display first few rows of the results  
result.head(15)

Attached is a notebook showing how to do this. The approach would be similar in an algo but the dataframe returned by pipeline would be a single index for the current day (not a multi index containing multiple days).

Got it! Thank you so much.

I wish you all the best in the future, you're so kind:)