title: How to drop multiple columns from a pandas dataframe if it contains any alphabet (non numeric)?
body: <p>I have pulled data from hive into python using pyhive. Now I have created a dataframe from the data imported. The dtype of all the columns in the dataframe is object. I wanted to know the best way to drop any column in the data frame that contains an alphabet(non numeric)?</p>
  
  <p>df.select_dtypes(['number']) wouldnt work since all my columns are dtype=object.</p>