3 useful Python scritps

Here are 3 useful Python scripts that I wrote for some time ago.

Clean .pyc files

I use Subversion for version control and I don't version the .pyc (Python
bytecode) files. Before I issue the status command to see what has changed to my source, I issue this script to delete all the .pyc files.

import os, sys
def pyc_clean(dir):
    findcmd = 'find %s -name "*.pyc" -print' % dir
    count = 0
    for f in os.popen(findcmd).readlines():
        count += 1
        print str(f[:-1])
        os.remove(str(f[:-1]))
    print "Removed %d .pyc files" % count 
if __name__ ==
    "__main__":    
    pyc_clean(".")

Searching for something specific with Python

I wanted to find "cherrypy.request" in all the files, but not in the .svn directories (which are Subversion's directories). I tried to solve this with Unix tools, reading some manuals, Goggling after an answer, but at last I gave up and wrote a simple Python script in 2 minutes...

import os, sys 
findcmd = 'grep -R
    "cherrpy.request" .'
print "Searching...:"
for f in os.popen(findcmd).readlines():
    if str(f[:-1]).find(".svn") == -1:
        print str(f[:-1])

Thanks to Kate for pointing out the grep equivalent. It is smarter and faster, but harder to find. Note to self: remember the -v option (invert match).

grep -r "cherrpy.request" * | grep -v ".svn"

Search and replace with Python

I had to replace every instance of "mosaicCMS" to "skeletonz" in .tmpl and .py files. I Goggled a bit, but didn't find anything that could solve my problem. I could have tried to find special search and replace application, but it's not my style. What did I do? I wrote my own little Python script to handle this little problem. Maybe an overkill, but it solved my problem :]

import os, sys 
count = 0
def rename(filetypes, oldname, newname):
  global count
  for filetype in filetypes:
    findcmd = 'find . -name "*.%s" -print' % filetype
    for f in os.popen(findcmd).readlines():
      file = str(f[:-1])
      count += 1
      print str("Rename %s" % file) 
      os.popen('sed -e "s/%s/%s/g" %s > %s.tmp'
          % (oldname, newname, file, file))
      os.popen('cat %s.tmp > %s' % (file, file)) 
      os.remove("%s.tmp" % file) 
rename(["py", "tmpl"], "mosaicCMS", "skeletonz")
print "Changed %s files" % count