pandas dataframe with 2-rows header and export to csv

Question

I have a dataframe

df = pd.DataFrame(columns = [\"AA\", \"BB\", \"CC\"])
df.loc[0]= [\"a\", \"b\", \"c1\"]
df.loc[1]= [\"a\", \"b\", \"c2\"]
df.loc[2]= [\"a\         


        

Answer 1

Building on top of @DSM's solution:

if you need (as I did) to apply the same hack to an export to excel, the main change needed (apart from expected differences with the to_excel method) is to actually remove the multiindex used for your column labels...

That's because .to_excel doesn't support writing out a df having a multiindex for columns but no index (providing index=False to the .to_excel method) contrarily to .to_csv

Anyway, here's what it would look like:

>>> writer = pd.ExcelWriter("noblankrows.xlsx")
>>> headers = pd.DataFrame(df.columns.tolist()).T
>>> headers.to_excel(
        writer, header=False, index=False)
>>> df.columns = pd.Index(range(len(df.columns)))  # that's what I was referring to...
>>> df.to_excel(
        writer, header=False, index=False, startrow=len(headers))
>>> writer.save()
>>> pd.read_excel("noblankrows.xlsx").to_csv(sys.stdout, index=False)
AA,BB,CC
DD,EE,FF
a,b,c1
a,b,c2
a,b,c3