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"""

Given a non-empty string check if it can be constructed by taking

a substring of it and appending multiple copies of the substring together.

For example:

Input: "abab"

Output: True

Explanation: It's the substring "ab" twice.

Input: "aba"

Output: False

Input: "abcabcabcabc"

Output: True

Explanation: It's the substring "abc" four times.

Reference: https://leetcode.com/problems/repeated-substring-pattern/description/

"""

def repeat_substring(s):

"""

:type s: str

:rtype: bool

"""

str = (s + s)[1:-1]

return s in str