invalid syntax

Question

File "<ipython-input-3-e7a2a01d420f>", line 2
elif not (1 + 1==3):
^
SyntaxError: invalid syntax

Answer 1

Given it is line 2, you made a mistake on line 1 or 2. To have an elif, it needs to be line 3 or beyond such as:
if false:
print("wrong")
elif not (1 + 1==3):