["python","pandas"]
Adding meta-information/metadata to pandas DataFrame

Is it possible to add some meta-information/metadata to a pandas DataFrame? For example, the instrument's name used to measure the data, the instrument responsible, etc. One workaround would be to create a column with that information, but it seems wasteful to store a single piece of information in every row!
Sure, like most Python objects, you can attach new attributes to a pandas.DataFrame: import pandas as pd df = pd.DataFrame([]) df.instrument_name = 'Binky' Note, however, that while you can attach attributes to a DataFrame, operations performed on the DataFrame (such as groupby, pivot, join, assign or loc to name just a few) may return a new DataFrame without the metadata attached. Pandas does not yet have a robust method of propagating metadata attached to DataFrames. Preserving the metadata in a file is possible. You can find an example of how to store metadata in an HDF5 file here.