Should I use 'has_key()' or 'in' on Python dicts?

Question

I wonder what is better to do: d = {'a': 1, 'b': 2} 'a' in d True or: d = {'a': 1, 'b': 2} d.has_key('a') True Select the correct answer from above options

Answer 1

If we talk about a more Pythonic way then “in” is preferred over has_key(). The advantage of “in” is it will work on any collection. has_key() is removed in Python 3.x. It is only in Python 2.x which is used very less. Also, it is a dictionary method and only used with dictionaries.