Create a DataFrame from Dict of Series

Dictionary of Series can be passed to form a DataFrame. The resultant index is the union of all the series indexes passed.

import pandas as pd
d = {'one' : pd.Series([1, 2, 3], index=['a', 'b', 'c']),
   'two' : pd.Series([1, 2, 3, 4], index=['a', 'b', 'c', 'd'])}
df = pd.DataFrame(d)
df
one two
a 1.0 1
b 2.0 2
c 3.0 3
d NaN 4

for the series one, there is no label ‘d’ passed, but in the result, for the d label, NaN is appended with NaN.