Convert text file date into specific format

[wavic]

>>> line = '2018/01/03 cccccc'
>>> date = line.split()[0].replace('/', '')
>>> date
'20180103'
>>> new_line = f'{date}{line[line.index(" "):]}'
>>> new_line
'20180103 cccccc'

For examaple. Or you can modify it to use datetime. Try with datetime because you are working with dates so you have to practise.