my first code, please correct

[robboc91]

hi Python community
I had gone through several Python tutorials before I sat down today to writing my first code

can you judge it, please? I use Colaboratory; how to allow it to access the excel files?

#preliminary steps
import numpy as np
import pandas as pd
import matplotlib as plt
import statsmodels as sm
data = pd.read_csv("portfolios.csv") 
bm = pd.read_csv("bookToMarket.csv") 
me = pd.read_csv("marketEquity.csv") 

#Extract 99 assets and assign them to a variable called assets.
for column in data:
    print(column [1:99])

#Obtain the number of rows and columns of assets and store results as rr and cc
#respectively.
rr = sheet.max_row
cc = sheet.max_column

#For each month in the data, sort the returns on the 99 assets based on the book-to- market ratio of those assets 
for column[1:99] in bm:
  assets_sorted = sorted()
for column[1:99] in me:
  me_sorted = sorted()

# placing the first 3 rows into a docstring
for row[:3] in assets_sorted:
  docstring()

for row[:3] in me_sorted:
  docstring()