[Python] Get all keys from GroupBy object in Pandas

I'm looking for a way to get a list of all the keys in a GroupBy object, but I can't seem to find one via the docs nor through Google.

There is definitely a way to access the groups through their keys, like so:

df_gb = df.groupby(['EmployeeNumber'])
df_gb.get_group(key)


...so I figure there's a way to access a list (or the like) of the keys in a GroupBy object. I'm looking for something like this:

df_gb.keys
Out: [1234, 2356, 6894, 9492]


I figure I could just loop through the GroupBy object and get the keys that way, but I think there's got to be a better way.

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