"Syntaxerror: invalid syntax" error

Question

I was trying to run a very simple program through the terminal (use gnome Ubuntu):

#encoding: utf-8
y = int(input("Ultimo número: "))
x=0
while x <= y
   if x % 2 == 0
     print (x)
   x=x+1

and I came across the following mistake:

File "pares.py", line 4

    while x <= y
               ^
SyntaxError: invalid syntax

What is the cause of the problem in this case?

Answer 1

Missed the : in the while and in the if, do so:

#encoding: utf-8
y = int(input("Ultimo número: "))
x=0
while x <= y:
   if x % 2 == 0:
     print (x)
   x=x+1

Follows doc: http://wiki.python.org.br/DocumentacaoPython