I just saw following problem on stackoverflow: http://stackoverflow.com/questions/27665560/concatenating-files-with-python-pandas
It is not possible to concatenate an empty sequence of data frames.
This tiny code fragment
import pandas as pd
dfs = []
pd.concat(dfs)
Throws following error:
/Users/ch/miniconda/envs/sci33/lib/python3.3/site-packages/pandas/tools/merge.py in __init__(self, objs, axis, join, join_axes, keys, levels, names, ignore_index, verify_integrity, copy)
765
766 if len(objs) == 0:
--> 767 raise ValueError('All objects passed were None')
768
769 # consolidate data & figure out what our result ndim is going to be
ValueError: All objects passed were None
I would suggest catching this special case in pd.concat before trying to merge and to raise an error with a clearer error description. For this special case, the current error message is not very helpful.
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