SyntaxError: Invalid syntax in a while loop

[ludegrae]

Hello everyone,
I would like to create a list of 12 numbers which each term is equal to the previous triple using a while loop.
Here is my code:

i, n=int(input("Enter a number:"), 1
while n<=12:
    print(i, end=",")
    i*=3
    n+=1

Error:
File "learning.py", line 2
    while n<=1:
        ^
SyntaxError: invalid syntax

I don't understand why it doesn't work, what should I do differently ?

[Larz60+]

i, n=int(input("Enter a number:"), 1

is invalid python syntax, the error is showing up on line 2 because of line 1 error

use something like:

try:
    n = int(input('Enter starting number: '))
    for i in range(12):
        print('{}, '.format(n), end = '')
        n = n * 3
except ValueError:
    print("Numbers only, please")

[ludegrae]

Thank you very much for the quick awnser and for your code. I'll check it!
Meanwhile I've found the error, it was a parenthesis missing in line 1.
Here is the script

n, i= 1, int(input("Enter a number:"))
while n<=12:
    if n!=12:
        print(i, end=", ")
    else:
        print(i)
    i*=3
    n+=1

It works !

Output:
Enter a number:1
1, 3, 9, 27, 81, 243, 729, 2187, 6561, 19683, 59049, 177147

[Larz60+]

Great!