Working hard-coded prototype

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+#!/usr/bin/python3
+# File: findversion.py
+# Author: bgstack15@gmail.com
+# Startdate: 2016-10-31
+# Title: Script that Displays Files and Version Numbers
+# Purpose: To show the available version numbers of a file
+# History:
+# Usage:
+#    findversion.py scrub.py /home/work
+#    findversion.py [--dir] /home/work [--filename] scrub.sh [--newestonly]
+# Reference:
+#    regex search http://stackoverflow.com/a/10477490
+#    regex https://docs.python.org/3/howto/regex.html
+#    manipulating dict https://docs.python.org/2/library/stdtypes.html#dict
+# Improve:
+
+import os, re
+
+findversionpyversion = "2016-10-31a"
+
+# DEFINE FUNCTIONS
+
+def isValidFile(_thisstring):
+   # return true if not png, tgz, or other non-text file
+   _isValidFile=True
+   if re.compile('.*\.(tgz|png|gif|jpg|pyc|pyo|git|swp)').match(_thisstring):
+      _isValidFile = False
+   elif os.path.islink(_thisstring):
+      _isValidFile = False
+   #print( _thisstring + ": " + str(_isValidFile) )
+   return _isValidFile
+
+# EXAMPLE VARIABLE VALUES
+searchdir = "/home/work/rpmbuild/SOURCES"
+searchfile = "updateval.py"
+newestonly = False
+
+# PREPARE VARIABLES
+#searchstring = re.sub("[^a-zA-Z0-9]", "", searchfile)
+searchstring = "updateval"
+pattern = re.compile(r'.*' + searchstring + r'version ?= ?([\"\'])[0-9]{4}(-[0-9]{2}){2}[a-zA-Z]\1')
+allversions = dict()
+
+# PERFORM SEARCH HERE
+for rootdir, subdirs, files in os.walk(searchdir):
+   for filename in files:
+      thispath = os.path.join(rootdir, filename)
+      #print("file: " + thispath)
+      if isValidFile(thispath):
+         for i, line in enumerate(open(thispath)):
+            for match in re.finditer(pattern, line):
+               #print('%s: %s: %s' % (thispath, i+1, match.group() ))
+               # get just version string
+               thisversion = re.sub( r'.*([0-9]{4}(-[0-9]{2}){2}[a-zA-Z]).*', r'\1', match.group())
+               #print("%s: %s" % (thisversion, thispath))
+               allversions[thisversion] = thispath
+
+# DISPLAY SORTED AND UNIQUE VERSION NUMBER WITH FILENAME
+for item in sorted(allversions):
+   print(str(item) + ": " + allversions[item])