Python has powerful scalability. I have listed 50 excellent Python modules, including almost all the needs, such as databases, guis, images, sound, OS interaction, web, and others. It is recommended to add to favorites.
Graphical interface wxpython http://wxpython.org
Graphical interface pygtk http://www.pygtk.org
Graphical interface pyqt http://www.riverbankcomputing.co.uk/pyqt/
Graphical interface PMW http://pmw.sourceforge.net/
Graphical interface tkinter 3000 http://effbot.org/zone/wck.htm
Graphical interface tix http://tix.sourceforge.net/
database mysqldb http://sourceforge.net/projects/mysql-python
database pygresql http://www.pygresql.org/
database Gadfly http://gadfly.sourceforge.net/
database sqlalchemy http://www.sqlalchemy.org/
database psycopg http://www.initd.org/pub/software/psycopg/
database kinterbasdb http://kinterbasdb.sourceforge.net/
database cx_oracle http://www.cxtools.net/default.aspx? NAV = downloads
database pysqlite http://initd.org/tracker/pysqlite
MSN Messenger msnlib http://auriga.wearlab.de /~ Alb/msnlib/
MSN Messenger pymsn http://telepathy.freedesktop.org/wiki/Pymsn
MSN Messenger msnp Co., http://msnp.sourceforge.net/
Networks twisted http://twistedmatrix.com/
Images Pil http://www.pythonware.com/products/pil/
Images gdmodule http://newcenturycomputers.net/projects/gdmodule.html
Images videocapture http://videocapture.sourceforge.net/
Scientific and maths scipy http://www.scipy.org/
Sciences and maths numpy http://numpy.scipy.org/
Sciences and maths http://www.stsci.edu/resources/software_hardware/numarray numarray
Scientific and maths matplotlib http://matplotlib.sourceforge.net/
Games pygame http://www.pygame.org/news.html
Games pyglet Co., http://www.pyglet.org/
Games pysoy http://www.pysoy.org/
Games pyopengl http://pyopengl.sourceforge.net/
Jabberpy http://jabberpy.sourceforge.net/
Web scrape http://zesty.ca/python/scrape.html
Web beautiful Soup http://crummy.com/software/BeautifulSoup
Web pythonweb http://www.pythonweb.org/
Web mechanics http://wwwsearch.sourceforge.net/mechanize/
Localisation geoname. py http://www.zindep.com/blog-zindep/Geoname-python/
Serial Port Python http://pyserial.sourceforge.net/
Serial Port USP http://ibarona.googlepages.com/uspp
Parallel Port pyparallel http://pyserial.sourceforge.net/pyparallel.html
USB port pyusb http://bleyer.org/pyusb/
Windows ctypes http://starship.python.net/crew/theller/ctypes/.
Windows pywin32 http://sourceforge.net/projects/pywin32/
Windows pywinauto http://www.openqa.org/pywinauto/
Windows Python http://pyrtf.sourceforge.net/
Windows WMI http://timgolden.me.uk/python/wmi.html
PDA/GSM/mobiles pymo http://www.awaretek.com/pymo.html
PDA/GSM/mobiles pys60 http://sourceforge.net/projects/pys60
Sound pysoundic http://pysonic.sourceforge.net/
Sound pymedia http://pymedia.org/
Sound fmod http://www.fmod.org/
Sound pymidi http://www.cs.unc.edu/Research/assist/developer.shtml
Gmail libgmail http://libgmail.sourceforge.net/
Google pygoogle http://pygoogle.sourceforge.net/
integrated CT pexpect http://pexpect.sourceforge.net/
WordNet pywordnet http://osteele.com/projects/pywordnet/
command line cmd http://blog.doughellmann.com/2008/05/pymotw-cmd.html
compiler backend llvm -py http://mdevan.nfshost.com/llvm-py/
http://vpython.org 3D vpython