Why do we use the join() function in Python?

The join() method joins all the items of a list, tuple or other iterable into one string. The string you call it on is used as the separator between the items.

words = ["Learn", "Python", "Fast"]

print(" ".join(words))
print("-".join(words))
print("".join(words))

Output:

All items must be strings. If the list has numbers, you get a TypeError, so convert them first.

numbers = [1, 2, 3]
print(",".join(str(n) for n in numbers))

Output:

join() is also faster than adding many strings with + in a loop.

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