unable to aggregate and summarize counts for a categorical variable

[dhairyadalal]

So I want to be to simply do a group by and count on a column with categorical values. When running the code below

df = pd.DataFrame({"animal": ["cat", "cat", "dog", "dog"],
                   "breed": ["tabby", "short hair", "poodle", "pug"],
                   "age": [1,2,3,4]
                  })

df >> group_by(X.animal) >> summarize(count=n(X.name))

I run into a AttributeError: 'str' object has no attribute 'size' error.

In dplyr, this would be the equivalent of:

df %>% group_by(animal) %>% summarise(count = n())

[Ignaciovf]

The error message can be better than this, but you are counting by a column that does not exist. The following code yields the required result:
dfsd >> group_by(X.animal) >> summarize(count=n(X.animal))

animal count
0 cat 2
1 dog 2