How do I delete a column that contains only zeros in Pandas?

Question

I currently have a dataframe consisting of columns with 1\'s and 0\'s as values, I would like to iterate through the columns and delete the ones that are made up of only 0\'

Answer 1

Here is an alternative way to use is

df.replace(0,np.nan).dropna(axis=1,how="all")

Compared with the solution of unutbu, this way is obviously slower:

%timeit df.loc[:, (df != 0).any(axis=0)]
652 µs ± 5.7 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

%timeit df.replace(0,np.nan).dropna(axis=1,how="all")
1.75 ms ± 9.49 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)