Simple Python Fuzzer

fuzz.py

def none(): return None
objects = ['none', 'bool', 'int', 'float', 'str', 'list', 'dict', 'tuple', 'set', 'object', 'bytes', 'bytearray']

f = open('/dev/urandom', 'rb')
def choice(a):
	i = ord(f.read(1)) % len(a)
	return a[i]

cnt_ok = 0
cnt_ex = 0

def fuzz_function(func, param):
	global cnt_ok, cnt_ex
	try:
		print(func, param)
		func(param)
		print('OK')
		cnt_ok += 1
	except Exception as ex:
		print('Exception:', ex)
		cnt_ex +=1

def fuzz_method(obj, method):
	fuzz_function(getattr(obj, method), [])
	for l in range(1, 7):
		for v in objects:
			fuzz_function(getattr(obj, method), [eval(v)()] * l)
	for v1 in objects:
		for v2 in objects:
			fuzz_function(getattr(obj, method), [eval(v1)(), eval(v2)()])

def fuzz_object(obj):
	methods = dir(obj)
	for m in methods:
		fuzz_method(obj, m)

for o in objects:
	fuzz_object(eval(o)())

print('Cases run:', cnt_ok + cnt_ex)
print('Cases OK: ', cnt_ok)
print('Cases Ex :', cnt_ex)