Can anyone explain how this works?😩

Question

What ist the outcome of this Python Program and how does it work?

a=7

a=int(input("enter a number:"))
z=0
for i in range (0,a,1):
z=z+a*i
if i<5:
for j in range (0, i+1,1):
z=z+j
print(str(z))

Thanks for help:)

Answer 1

#First 2 variables are given a value
a = 7
z = 0

#Second a for loop is created to iterate through a range object from 0 to 7.
#In each iteration variable i is increased by 1.
for i in range(0, 7, 1):

#In the for loop z changes it's value with a certain logic.
#And if i is less than 5 an inner for loop is created, which iterates from 0 to i+1 and in each iteration it also changes z value with another logic.

The z value is
0
+7*0+0
+7*1+0+1
+7*2+0+1+2
+7*3+0+1+2+3
+7*4+0+1+2+3+4
+7*5
+7*6
z final value is 167