Get a dependency graph of the scripts in a directory

what_is_going_on.py

#!/usr/bin/env python3

import os
import sys
import networkx as nx
from networkx.drawing.nx_pydot import write_dot

filename = sys.argv[1] if len(sys.argv) > 1 else "output.dot"

FILE_SIZE_LIMIT = 5 * 1024 * 1024 # bytes

files = os.listdir(".")
filtered = [x for x in files if os.stat(x).st_size < FILE_SIZE_LIMIT \
        and os.path.isfile(x)]
filtered = [x for x in filtered if x != filename and x != __file__.replace("./", "")]

G = nx.DiGraph()
for i in filtered:
    G.add_node(i)

for target in filtered:
    with open(target) as fp:
        try:
            txt = fp.read()
        except:
            continue
        for needle in filtered:
            if needle in txt:
                G.add_edge(target, needle) # target file uses needle file

to_remove = []
for key, val in G.degree:
    if val == 0:
        to_remove.append(key)

for x in to_remove:
    G.remove_node(x)

write_dot(G, filename)