I'm reading a CSV with float numbers like this:

Bob,0.085
Alice,0.005

And import into a dataframe, and write this dataframe to a new place

df = pd.read_csv(orig)
df.to_csv(pandasfile)

Now this pandasfile has:

Bob,0.085000000000000006
Alice,0.0050000000000000001

What happen? maybe I have to cast to a different type like float32 or something?

Im using pandas 0.9.0 and numpy 1.6.2.

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