/Python/How to tell python to go back to a previous line

How to tell python to go back to a previous line

def main(): #defines the area in indents that will be triggered with main()#
print('hi')
yn = input('Wanna loop back to the start? ')
if yn = 'yes':
main() #loops back to where we defined main#
main() #This starts the main loop, without this, main would just be defined but not run#

Is there a way to refer back to a previous line in python

'There is no answer'

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