how to concatenate two lists in python

data1 = [1, 2, 3]
data2 = [4, 5, 6]

data = data1 + data2

print(data)

# output : [1, 2, 3, 4, 5, 6]

>>> t1 = ['a', 'b', 'c']
>>> t2 = ['d', 'e']
>>> t1.extend(t2)
>>> print(t1)
['a', 'b', 'c', 'd', 'e']