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Finding 9 characters before a particular string in Python

For example here I have a line '2020-08-12 13:45:04 0.86393 %contrastWeber' and I need to extract 9 characters before ' %contrastWeber' string in text file. So, here my answer will be '0.86393'. I don't understand how to do it in Python? please help

1

Solution 
  • line = '2020-08-12 13:45:04 0.86393 %contrastWeber'

position = line.index('%contrastWeber')

if position >= 0:
    starting = position - 9
    if starting < 0:
        starting = 0
    ending = position
    print(line[starting : ending])
else:
    print('is not found')