how to sum numbers of a list in python without sum
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# METHOD 1 (without using the sum function) :
def list_sum(list_name):
value = 0
for values in list_name:
value += values
print(value)
# -------------------------------------------
# METHOD 2 (using the sum function) :
p = [1,5,3,4,6,7]
p_sum = sum(p)