def _random_replacement(working_on: List[str]) -> List[str]:
p_per_char = 1.0 / len(working_on)
return [
randomness.next_char()
if randomness.next_float() < p_per_char else char
for char in working_on
]
def _random_insertion(working_on: List[str]) -> List[str]:
pos = 0
if len(working_on) > 0:
pos = randomness.next_int(0, len(working_on) + 1)
alpha = 0.5
exponent = 1
while (randomness.next_float() <= pow(alpha, exponent)
and len(working_on) < config.INSTANCE.string_length):
exponent += 1
working_on = working_on[:pos] + [randomness.next_char()
] + working_on[pos:]
return working_on
def test_next_char_printable():
assert randomness.next_char() in string.printable