Question

Is there a nice approach to test if a dictionary contains multiple keys?

A short version of:

d = {}
if 'a' in d and 'b' in d and 'c' in d:
    pass #do something

Thanks.

Edit: I can only use python2.4 -.-

Answer 1

You can use set.issubset(...), like so:

>>> d = {'a': 1, 'b': 2, 'c': 3}
>>> set(['a', 'b']).issubset(d)
True
>>> set(['a', 'x']).issubset(d)
False

---

Python 3 has introduced a set literal syntax which has been backported to Python 2.7, so these days the above can be written:

>>> d = {'a': 1, 'b': 2, 'c': 3}
>>> {'a', 'b'}.issubset(d)
True
>>> {'a', 'x'}.issubset(d)
False