Initialize dataframe with unknown row number

Post date: Jan 30, 2015 9:50:03 PM

Here I want to initialize dataframe with unknown row numbers, running in for loop. I use

pd.concat

example showed below:

tmp = pd.DataFrame()

for i in [1,2,3,4]:

    tmp_b = pd.DataFrame({'a':[i],'b':[str(i)]})

    tmp = pd.concat([tmp,tmp_b],ignore_index=True, axis=0)

tmp