toms097, a Python code which computes the distance between all pairs of nodes in a directed graph with weighted edges, using Floyd's algorithm.
The text of many ACM TOMS algorithms is available online through ACM: https://calgo.acm.org/ or NETLIB: https://www.netlib.org/toms/index.html.
The computer code and data files made available on this web page are distributed under the GNU LGPL license.
toms097 is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
bellman_ford, a Python code which implements the Bellman-Ford algorithm for finding the shortest distance from a given node to all other nodes in a directed graph whose edges have been assigned real-valued lengths.
dijkstra, a Python code which runs a simple example of Dijkstra's minimum distance algorithm for graphs.