needed help with a code why does changing b changes a as well

Question

a=[2,2,2,2,2,2,2]
k=2
b=a
count=0
for i in range(1,len(a)):
b[i]=b[i-1]+k
for i in range(len(a)):
if a[i]==b[i]:
pass
else:
count+1
print(a,b)

Answer 1

Becase "b" its a reference of "a" content (a list)... You have to copy the list like:

b= a[:]

Answer 2

good

Answer 3

a = [1, 2, 3]
b = a
b == a # True
b is a # True

In the above, b and a point to the same places in memory. Changing one will change the other because they are the same.

c = a[:]
c == a # True
c is a # False

In the above c has the same values as a, but they’re saved in a different place in memory. Then you can change one list without changing the other.

Answer 4

thanks guys