Max Sub-array Total using basic list append method (Python)

Max Sub-array Total using basic list append method (Python)
Surprisingly fast for low-level code that I made just messing around.
#subarray #maximum #python
%%timeit -r1 -n1 #Alternative Maximum Subarry, Ralph Turchiano
x=0
k = []
for i in rl2:
x +=i
if x less than 0:
x=0
print(max(k))