Merge Two Lists in Python:

• The simplest way to merge two lists is by using the + operator.

a = [1, 2, 3]
b = [4, 5, 6]

# Merge the two lists and assign
# the result to a new list
c = a + b
print(c)

• Another common method is to use the extend() function, which modifies the original list by adding elements from another list.

a = [1, 2, 3]
b = [4, 5, 6]

# Add all elements from list 'b' to the end of list 'a'
a.extend(b)

print(a)

• Using the * Operator

  We can use the *** operator** to unpack the elements of multiple lists and combine them into a new list.

  a = [1, 2, 3]
  b = [4, 5, 6]
  
  # Use the unpacking operator to merge the lists
  c = [*a, *b]
  
  print(c)
  

• Using for loop

  We can also merge two lists using a simple for loop. This approach is provides more control if we need to perform additional operations on the elements while merging.

a = [1, 2, 3]
b = [4, 5, 6]

# Initialize an empty list to store the merged elements
res = []

# Append all elements from the first list
for val in a:
    res.append(val)

# Append all elements from the second list
for val in b:
    res.append(val)

print(res)

https://www.geeksforgeeks.org/python-ways-to-concatenate-two-lists/