python while loop

Question

I have difficulties understanding how this code outputs the values below.

Code:
i = 0
x = 0
while i < 4:
print(x)
x+=i
i+=1

Output:
0
0
1
3

Answer 1

Visualize your code execution

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https://pythontutor.com

Answer 2

i = 0
x = 0
while i < 4:
print(x)
#x=0,x=0,x=1,x=4
x+=i
#x=0 since i=0,now x=1,x=3
i+=1
#now i=1,i=2,i=3

"""Output:
0
0
1
3"""

Answer 3

Hope this helps you