Howto solve this solution with python?

Question

2. This is a program to analyze mobile numbers using match() function. Please fill out the blanks to
get the outcomes as below.
Note: re.compile() complies a regular expression pattern into a regular expression object,
which can be used for matching using its match() or search(). Mobile phone number in
Korea starts with 3 digit numbers followed by 3~4 and 4 digits fixed customer numbers.
(e.g., 010-2345-5678 or 010-234-5678)
<Output>
('010', '123', '4567')
010-123-4567
('123', '4567')
0

Answer 1

You mast use re ?
def check (arr):
if len(arr) != 3:
return 0
if len(arr[o]) != 3:
return 0
l = len(arr[1])
if l != 3 or l != 4:
return 0
if arr[2] != 4:
return 0
return "-".join(arr)