Fastest way to insert these dashes in python string?

Question

So I know Python strings are immutable, but I have a string:

c[\'date\'] = \"20110104\"

Which I would like to convert to

c[\'da         


        

Answer 1

Add hyphen to a series of strings to datetime

import datetime
for i in range (0,len(c.date)):
  c.date[i] = datetime.datetime.strptime(c.date[i],'%Y%m%d').date().isoformat()