define throws error when accessing column named 'n'

[neo-anderson]

from plydata import (define, rename, query)
df = pd.DataFrame({'n': [1,2,3]})
df >> define(y = 'n+1')

throws TypeError: unsupported operand type(s) for +: 'function' and 'int' query function has no issues with it though.

from plydata import (define, rename, query)
df = pd.DataFrame({'n': [1,2,3]})
df >> query('n>1')

[has2k1]

n is a special function. To prevent surprises, it may be worth it to make an exception in cases where the dataframe has a column named n.