First commit

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.cache
+nosetests.xml
+coverage.xml
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# PYC 
+*.pyc

abp.py

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+class Vertex(object):
+    def __init__(self):
+        self.neighbors = set()
+
+    def __str__(self):
+        return "v: {}".format(", ".join(map(str, self.neighbors)))
+
+class GraphRegister(object):
+    def __init__(self, n):
+        self.vertices = [Vertex() for i in xrange(n)]
+
+    def add_edge(self, v1, v2):
+        self.vertices[v1].neighbors.add(v2)
+        self.vertices[v2].neighbors.add(v1)
+
+
+    def del_edge(self, v1, v2):
+        self.vertices[v1].neighbors.remove(v2)
+        self.vertices[v2].neighbors.remove(v1)
+
+    def __str__(self, ):
+        return "\n".join(str(v) for v in self.vertices)
+
+if __name__ == '__main__':
+    g = GraphRegister(10)
+    g.add_edge(0,1)
+    print g
+