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SymPy | Prufer.edges() in Python
• Last Updated : 28 Aug, 2019

Prufer.edges() : edges() is a sympy Python library function that returns the number of nodes and a list of edges from the given runs that connect nodes in an integer labelled tree.

Syntax :
sympy.combinatorics.Prufer.prufer.edges()

Return :
number of nodes and a list of edges

Code #1 : edges() Example

 `# Python code explaining``# SymPy.Prufer.edges()`` ` `# importing SymPy libraries``from` `sympy.combinatorics ``import` `Permutation, Cycle``from` `sympy.combinatorics.prufer ``import` `Prufer`` ` `# Using from ``# sympy.combinatorics.prufer.Prufer.edges()`` ` `# Creating Prufer``a ``=` `Prufer.edges([``1``, ``2``, ``3``], [``2``, ``4``, ``5``])`` ` `# edge value``print` `(``"Prufer a edges : "``, a)`

Output :

Prufer a edges : ([[0, 1], [1, 2], [1, 3], [3, 4]], 5)

Code #2 : edges() Example

 `# Python code explaining``# SymPy.Prufer.edges()`` ` `# importing SymPy libraries``from` `sympy.combinatorics ``import` `Permutation, Cycle``from` `sympy.combinatorics.prufer ``import` `Prufer`` ` `# Using from ``# sympy.combinatorics.prufer.Prufer.edges()`` ` `# Creating Prufer``b ``=` `Prufer.edges([``1``, ``2``, ``3``, ``2``, ``4``, ``5``], [``6``, ``7``], [``8``])`` ` `# edge value`` ` `print` `(``"Prufer b edges : "``, b)`

Output :

Prufer b edges : ([[0, 1], [1, 2], [1, 3], [3, 4], [5, 6]], 7)

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