Python: Divide each row of a DataFrame by another DataFrame vector

Question

I have a DataFrame (df1) with a dimension 2000 rows x 500 columns (excluding the index) for which I want to divide each row by another DataFrame (df2) with dime

Answer 1

You can divide by the series i.e. the first row of df2:

In [11]: df = pd.DataFrame([[1., 2.], [3., 4.]], columns=['A', 'B'])

In [12]: df2 = pd.DataFrame([[5., 10.]], columns=['A', 'B'])

In [13]: df.div(df2)
Out[13]: 
     A    B
0  0.2  0.2
1  NaN  NaN

In [14]: df.div(df2.iloc[0])
Out[14]: 
     A    B
0  0.2  0.2
1  0.6  0.4