This is no formal installation for this package (or any packages in gisalgs). However, installing the code is not complicated. It is important to organize everything in a directory and each package such as geom is a subdirectory. Now suppose we use the directory at the root called /lib to store everything and we create a subfolder called gisalgs there. Under the /lib/gisalgs directory, create a subdirectory called geom and save all the files in this repository in geom. It will be essential to have the __init__.py in geom (this is just an empty file with the specific file name). Lastly, make sure to copy __init__.py to the parent directory (in this case, /lib/gisalgs).
The following is an example of using modules in this repository:
import sys
sys.path.append('/lib/gisalgs')
from geom.point import *
p, p1, p2 = Point(10,0), Point(0,100), Point(0,1)
print(p.distance(p1))
print(p1)