Pythonic way to check if two dictionaries have the identical set of keys?
>>> not set(d_1).symmetric_difference(d_2)
False
>>> not set(d_1).symmetric_difference(dict.fromkeys(d_1))
True
In Python 3,
dict.keys()
returns a "view object" that can be used like a set. This is much more efficient than constructing a separate set.d_1.keys() == d_2.keys()
In Python 2.7,
dict.viewkeys()
does the same thing.d_1.viewkeys() == d_2.viewkeys()
In Python 2.6 and below, you have to construct a set of the keys of each dict.
set(d_1) == set(d_2)
Or you can iterate over the keys yourself for greater memory efficiency.
len(d_1) == len(d_2) and all(k in d_2 for k in d_1)
In Python2,
set(d_1) == set(d_2)
In Python3, you can do this which may be a tiny bit more efficient than creating sets
d1.keys() == d2.keys()
although the Python2 way would work too
You can get the keys for a dictionary with dict.keys()
.
You can turn this into a set with set(dict.keys())
You can compare sets with ==
To sum up:
set(d_1.keys()) == set(d_2.keys())
will give you what you want.