Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/py_compile.py", line 117, in compile
    raise py_exc
py_compile.PyCompileError:   File "/w/foo.py", line 4
       if n%4==0 and n%100!=0 or n%400==0:
    ^
SyntaxError: invalid syntax