Respect original names of call terms

[Tomás Capretto]

import pandas as pd
from formulae import design_matrices

df = pd.DataFrame({"x": [0, 1, 2, 3]})

def f(x, a="test"):
    return x

design_matrices("f(x, a='not-test')", df).common

CommonEffectsMatrix with shape (4, 2)
Terms:  
  Intercept  
    kind: intercept
    column: 0
  f(x, a = not-test)  
    kind: numeric
    column: 1

To access the actual design matrix do 'np.array(this_obj)'

The term was originally written as "f(x, a='not-test')" but it shows "f(x, a = not-test) ".

• Adds space around the = symbol
• Removes quotes from the string argument