union find data structure in python

UnionFind.py

class UnionFind:
    def __init__(self, N):
        self.parent=[i for i in range(N+1)]
    def findParent(self, v):
        if self.parent[v]==v: return v
        else: return self.findParent(self.parent[v])
    def union(self, v, w):
        vp=self.findParent(v)
        wp=self.findParent(w)
        self.parent[vp]=wp