Converting Dataframe in Python from Object to Float

[ThomasL]

You need to get rid of the commas in the strings

df['GER30_Open_float'] = df['GER30_Open'].str.replace(',', '').astype(float)

As already mentioned if using pandas.read_csv() you can use parameter thousands=',' to get rid of the commas

df = pandas.read_csv('example.csv', thousands=',')