SyntaxError：语法无效

Question

I am using Python 2.6.6 and is a newbie. I am getting

  File "./factorizer.py", line 35
    return {n: factorize_naive(n) for n in nums}
                                    ^
SyntaxError: invalid syntax

in the for statement within the return. It is supposed to return a dict with each element having number as key and list of prime factors as value. Where am I going wrong?

Answer 1

Dictionary comprehensions are only available in Python 2.7 and above. You'll need to use another method, preferably using dict() :

dict((i, factorize_naive(i)) for i in nums)