Let’s you have a list in Python:
1 | a = [1, 2, 3, 4] |
a = [1, 2, 3, 4]
And you have another list in Python:
1 | b = [5, 6, 7, 8] |
b = [5, 6, 7, 8]
You can concatenate two lists by simply using + operator, which will leave both lists untouched and return a copy of the concatenated list.
1 | a + b # [1, 2, 3, 4, 5, 6, 7, 8] |
a + b # [1, 2, 3, 4, 5, 6, 7, 8]
You can use extend() method of the array, which allows us to append all the elements from another list to it. This will modify the original list.
1 2 3 | # c is None c = a.extend(b) # a is now [1, 2, 3, 4, 5, 6, 7, 8] |
# c is None c = a.extend(b) # a is now [1, 2, 3, 4, 5, 6, 7, 8]
The append() on the other hand, appends an element to the list. For example,
1 2 3 | a = [1, 2, 3, 4] a.append(5) # a is now [1, 2, 3, 4, 5] |
a = [1, 2, 3, 4] a.append(5) # a is now [1, 2, 3, 4, 5]
The append returns None. You can use append to achieve what the extend does.
1 2 3 | def extend(a, b): for x in b: a.append(x) |
def extend(a, b):
for x in b:
a.append(x)–EOF (The Ultimate Computing & Technology Blog) —
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