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Some gems from Intermediate Python

Last week, I ran a private Python Intermediate course - using Python 2.7 at customer request - and here are some of the code snippets I wrote in front of the class - little things I may not have blogged about in the past. Complete examples being emailed to the delegates!

 # with keyword to perform open and closure on object
 # -------------------------------------------------
 
 with table.rectangularTable("Bob","3",2000,100) as ourparty:
         print ourparty
         print ourparty.getSeats()
 print ourparty
 
 # defining your own "with"
 # -----------------------
 
         def __enter__(this,*t,**tt):
                 print "We have a nice table by the window"
                 print t,tt
                 return this
         def __exit__(this,*t,**tt):
                 print "Can we have a cleaner over here please?"
                 print t,tt
 
 # map, filter and reduce examples
 # -------------------------------
 
 teams = map(lambda x: x/11,sizes)
 fewspares = filter(lambda x: x%11 < 1,sizes)
 ballgames = filter(lambda x:x.find("ball")>-1,games)
 print reduce(lambda x,y: x+y, sizes)
 
 # Python 2 - sorting
 # ------------------
 
 found.sort(lambda x,y:cmp(len(x),len(y)) or cmp(x,y))
 
 # Python 2 v Python 3 sorting
 # ---------------------------
 
 if sys.version_info < (3,0):
         found.sort(lambda x,y:cmp(len(x),len(y)))
 else:
         found.sort(key = lambda x:len(x))
 
 # Python 2 and 3 compatible printing
 # ----------------------------------
 
 print("Here are the remote IP visitors to your images")
 for k in range(len(found)):
         sep = ((k+1)%4 and k+1 != len(found)) and " " or "\n"
         sys.stdout.write("%16s%s"%(found[k],sep))
(written 2016-10-30)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Y199 - Python - Fast Start
  [4713] Equality (in Python) - (2016-10-30)
  [4712] A reminder of the key issues to consider in moving from Python 2 to Python 3 - (2016-10-30)
  [4707] Some gems from an introduction to Python - (2016-10-29)
  [3519] Python - current versions and implementations (CPython, Jython, IronPython etc) - (2011-11-13)
  [2017] Python - a truly dynamic language - (2009-01-30)

Y115 - Additional Python Facilities
  [4593] Command line parameter handling in Python via the argparse module - (2015-12-08)
  [4536] Json load from URL, recursive display, Python 3.4 - (2015-10-14)
  [4451] Running an operating system command from your Python program - the new way with the subprocess module - (2015-03-06)
  [4439] Json is the new marshall, pickle and cPickle / Python - (2015-02-22)
  [4298] Python - an interesting application - (2014-09-18)
  [4211] Handling JSON in Python (and a csv, marshall and pickle comparison) - (2013-11-16)
  [4085] JSON from Python - first principles, easy example - (2013-05-13)
  [3469] Teaching dilemma - old tricks and techniques, or recent enhancements? - (2011-10-08)
  [3442] A demonstration of how many Python facilities work together - (2011-09-16)
  [3089] Python regular expressions - repeating, splitting, lookahead and lookbehind - (2010-12-17)
  [2790] Joining a MySQL table from within a Python program - (2010-06-02)
  [2786] Factory methods and SqLite in use in a Python teaching example - (2010-05-29)
  [2765] Running operating system commands from your Python program - (2010-05-14)
  [2764] Python decorators - your own, staticmethod and classmethod - (2010-05-14)
  [2746] Model - View - Controller demo, Sqlite - Python 3 - Qt4 - (2010-04-29)
  [2745] Connecting Python to sqlite and MySQL databases - (2010-04-28)
  [2721] Regular Expressions in Python - (2010-04-14)
  [2655] Python - what is going on around me? - (2010-02-28)
  [2462] Python - how it saves on compile time - (2009-10-20)
  [2435] Serialization - storing and reloading objects - (2009-10-04)
  [2407] Testing code in Python - doctest, unittest and others - (2009-09-16)
  [1876] Python Regular Expressions - (2008-11-08)
  [1337] A series of tyre damages - (2007-09-08)
  [1336] Ignore case in Regular Expression - (2007-09-08)
  [1305] Regular expressions made easy - building from components - (2007-08-16)
  [1149] Turning objects into something you can store - Pickling (Python) - (2007-04-15)
  [1136] Buffering output - why it is done and issues raised in Tcl, Perl, Python and PHP - (2007-04-06)
  [1043] Sending an email from Python - (2007-01-18)
  [901] Python - listing out the contents of all variables - (2006-10-21)
  [753] Python 3000 - the next generation - (2006-06-09)
  [672] Keeping your regular expressions simple - (2006-04-05)
  [663] Python to MySQL - (2006-03-31)
  [463] Splitting the difference - (2005-10-13)
  [239] What and why for the epoch - (2005-03-08)
  [208] Examples - Gadfly, NI Number, and Tcl to C interface - (2005-02-10)
  [183] The elegance of Python - (2005-01-19)


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Convering from Python 2 to Python 3 - an update, and the 2to3 utility
Searching a Json or XML structure for a specific key / value pair in Python
Some gems from Intermediate Python
Scons - a build system in Python - building hello world
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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