python array append extend
my_list = ['a','b']
my_list.append('c')
print(my_list) # ['a','b','c']
other_list = [1,2]
my_list.append(other_list)
print(my_list) # ['a','b','c',[1,2]]
my_list.extend(other_list)
print(my_list) # ['a','b','c',[1,2],1,2]