Conditional Practice

cond.py

from random import choice, sample, randint

suj = ['Je', 'Tu', 'Il', 'Elle', 'Nous', 'Vous', 'Ils', 'Elles', 'On']
ends = ['ais', 'ais', 'ait', 'ait', 'ions', 'iez', 'aient', 'aient', 'ait']
vb = ['aller', 'avoir', 'être', 'faire', 'pouvoir', 'devoir', 'savoir', 'venir', 'voir', 'vouloir']
pt = ['ir', 'aur', 'ser', 'fer', 'pourr', 'devr', 'saur', 'viendr', 'verr', 'voudr']

assert len(suj) == len(ends)
assert len(vb) == len(pt)

while True:
    print('Conjugate verbs!')
    cis = randint(0, len(suj) - 1)
    csuj = suj[cis]
    cend = ends[cis]
    ci = randint(0, len(vb) - 1)
    cvb = vb[ci]
    cpt = pt[ci]

    print('Conjugate %s + %s:' % (csuj, cvb))
    ret = input()

    f = csuj + ' ' + cpt + cend
    if f.lower() != ret.lower():
        print('Incorrect! Answer is "%s"' % f)
    else:
        print('Correct!')
    print()