Handle cyclic relation compared by value.
Install from Pypi:
pip install cyclicfrom cyclic import Cyclic
cy = Cyclic()
# Let's say A is a prent of B
cy.add(B, A)
# B is a parent of C
cy.add(C, B)
# C is a parent of A (cyclic)
cy.add(A, C)
# let's see if C is in any kind of cyclic relation
print(cy.is_cyclic(C)) # True
