List assigning to another variable, then original variable also changes when there will happen an operation on child variable

Question

a = [1,2,4]
b=a
b.insert(1,45)
print(a,b)

results a = [1,45,2,4] b = [1,45,2,4]

why a is changing is there any way, where b will change

Answer 1

That's because you're just reassigning the same instance. You need to do this instead of b=a:

b = a.copy()