Problem with using while loop

i=int(input('Enter a postive integer '))
while i <:
  print('before ',i)
  i=i * (i-1)
  print('after ',i)

i have tries in different ways but i am not able to write logic for factorials

Use for loop don’t use while loop for this question
so in case of factorial for 5, start with number before the loop as y = 1 and then update its value in loop by multiplying by loop numbers. Final value of y becomes factorial

y = 1
for i in range(1,5):
    # update the value of y here
for i in range(1,5):

this is not giving factorial it is just giving 2,4,6,8

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