[Python] Difference between Index and RangeIndex in pandas

I have two pandas dataframe df1 and df2, which look the same, but have a difference in the index, if you print both, it looks like:

print(df1)
Kalenderjahr/Monat Kostenstelle Kontonummer Wert timepoint
0 202410 A 0054010000 32641.10 2024-10-01
184 202303 B 0054010008 238.14 2023-03-01


print(df2)
Kalenderjahr/Monat Kostenstelle Kontonummer Wert timepoint
0 202410 A 0054010000 32641.10 2024-10-01
184 202303 B 0054010008 238.14 2023-03-01


and if I Print the index:

print(df1.index)
dtype: object
RangeIndex(start=0, stop=156, step=1)

print(df2.index)
dtypebject


How can I adjust df1 the same way, that it has the same index structure as df2? what is the difference between the two?

The index of df1 'RangeIndex'. The index of df2 is a 'Int64Index'.

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