Count zeros and ones in decimals binary representation

__main__.py

def dec2bin(dec):
	return str(bin(dec))[2:]

def cnt_ones(num, zeros=False):
	binform = dec2bin(num)
	vtc = "1"
	if zeros:
		vtc = "0"
	return sum([1 for i in binform if i == vtc])

var = 4**2016+2**2018-6
print("bin:", dec2bin(var))
print("1:", cnt_ones(var))
print("0:", cnt_ones(var, True))