import os
import re
import shutil

versions = []
folders = []
a = os.listdir('.')
a.sort(reverse=True)
sorted(a)

for fn in a:
    folders.append(fn)
    if os.path.isdir(fn):
        version = (re.match('^([0-9]+.[0-9]+.[0-9]+).*', fn)).group(1)
        if (version) not in versions:
            versions.append(version)

result = []


for version in versions:
    temp = []
    for folder in folders:
        if folder.startswith(version):
            temp.append(folder)

    result.append(temp)
print result

for version in result:
   for i in range(max(len(version) - 3, 0)):
       print version[i]
 #   shutil.rmtree(version[i])

10.7.0.290 #this files are deleted
10.7.0.289 #this files are deleted
10.6.7.282 #this files are deleted