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The Python Simple Directed Graph whith Cicle Detector and TopoloGical sorter utilities.
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examples
scripts
sdag2
tests
.gitignore
MANIFEST.in
README.rst
pypi-dist.sh
setup.py

README.rst

SDAG2 - Python Simple Directed Acyclic Graph

The Python Simple Directed Graph whith Cicle Detector and TopoloGical sorter utilities.

Project Home Page

This project was be hosted on Github.

Authors

Install

Install it using the Python PIP Project.

pip install sdag2

Scripts

tsort.py

Sources from Standard Input:

echo -e 'C A\nA B\nB D\nC D' | tsort.py

Sources from another file:

echo -e 'C A\nA B\nB D\nC D' > verticies.txt
tsort.py verticies.txt

More Options:

tsort.py --help
Usage: tsort.py [options] [FILE [OUT_FILE]]

Options:
  -h, --help            show this help message and exit
  -f FILE, --file=FILE  With no FILE, or when FILE is -, read standard input.
  -o OUT_FILE, --out-file=OUT_FILE
                        Write result to OUT_FILE, default is standard output.
  -s SEP, --separator=SEP
                        Items separator, default is \s regex.
  -q QUIT_SEQ, --quit-sequence=QUIT_SEQ
                        Stop read FILE where line equals QUIT_SEQ, default is
                        :quit.

Tests

import unittest
from sdag2 import DAG, CycleDetectedException

class DAGTest(unittest.TestCase):
    def test_simple(self):
        '''
        Tests the verticles order in:

        C --> A --> B --> D
        '''

        dag = DAG()
        a = dag.add("A")
        b = dag.add("B")
        c = dag.add("C")
        d = dag.add("D")

        dag.add_edge(c, a)
        dag.add_edge(a, b)
        dag.add_edge(b, d)
        dag.add_edge(c, d)

        rs = dag.topologicaly()

        self.assertTrue(rs.index("C") < rs.index("A"))
        self.assertTrue(rs.index("A") < rs.index("B"))
        self.assertTrue(rs.index("B") < rs.index("D"))
        self.assertTrue(rs.index("C") < rs.index("D"))

    def test_cicle_detect(self):
        '''
        Tests the verticles order in:

        C --> A --> B --> D -> C
        '''

        dag = DAG()
        a = dag.add("A")
        b = dag.add("B")
        c = dag.add("C")
        d = dag.add("D")

        dag.add_edge(c, a)
        dag.add_edge(a, b)
        dag.add_edge(b, d)
        dag.add_edge(c, d)

        try:
            # add cicle at A --> C --> A
            dag.add_edge(a, c)
            raise Exception("Cycle not detected")
        except CycleDetectedException: pass

def main():
    unittest.main()

if __name__ == "__main__":
    main()
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