X = [1, 4, 9, 16, 25, 36] # create a list of integers
X[1]=5; print(X)          # modify element 1
X.append(49); print(X)    # append a value as last element
X.insert(3,10); print(X)  # insert a value as element 3
del X[3]; print(X)        # delete element 3
X.remove(36); print(X)    # remove the first occurence element by value