Hypothesis

from hypothesis import given

from hypothesis.strategies import text

def encode(input_string):

# Hypothesis will capture the case when s = ""

#    if not input_string:

#        return []

    count = 1

    prev = ""

    lst = []

    for character in input_string:

        if character != prev:

            if prev:

                entry = (prev, count)

                lst.append(entry)

            count = 1

            prev = character

        else:

            count += 1

    entry = (character, count)

    lst.append(entry)

    return lst

def decode(lst):

    q = ""

    for character, count in lst:

        q += character * count

    return q

@given(text())

def test_decode_inverts_encode(s):

    assert decode(encode(s)) == s

test_decode_inverts_encode()

 Create a pandas dataframe

from hypothesis.extra.pandas import column, data_frames

df = data_frames([column("A", dtype=int), column("B", dtype=float)]).example()

 Create a numpy array

from hypothesis.extra.numpy import arrays

arr = arrays(dtype=int, shape=(2, 2)).example()