I want to group a dataframe by a column, called 'A', and inspect a particular group.

grouped = df.groupby('A', sort=False)

However, I don't know how to access a group, for example, I expect that

grouped.first() 

would give me the first group

Or

grouped['foo'] 

would give me the group where A=='foo'.

However, Pandas doesn't work like that.

I couldn't find a similar example online.

Try: grouped.get_group('foo'), that is what you need.