Find mixed types in Pandas columns

Question

Ever so often I get this warning when parsing data files:

WARNING:py.warnings:/usr/local/python3/miniconda/lib/python3.4/site-
packages/pandas-0.16.0_12_gdcc         


        

Answer 1

In addition to DSM's answer, with a many-column dataframe it can be helpful to find the columns that change type like so:

for col in df.columns:
    weird = (df[[col]].applymap(type) != df[[col]].iloc[0].apply(type)).any(axis=1)
    if len(df[weird]) > 0:
        print(col)