Making a number list in a .txt file

[kwak86]

Hello,

I would like making a list of number in a file I can read with notepad.

I try this:

f=open("dico.txt","w")
a=0
while a<=999999:
	if a<=99999:
		def add_zero(nbr: str, m: int = 6) -> str:
			return "0" * (m - len(nbr)) + nbr
	f.write(str(a))
	a=a+1
	else:
    f.write(str(a))
	a=a+1
f.close()

A syntax error in the "else" line appears.

Could you tell me why?