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Copying - duplicating data, or just adding a name? Perl and Python compared Archive tea = lunch chucked = lunch[:] lunch[0] = "Mints" lunch[2][1] = "Beans"and chucked [source in Perl] and [source in Python]
Some other articles Y111 - More on Collections and Sequences Mutable v Immuatble objects in Python, and the implication Accessing variables across subroutine boundaries - Perl, Python, Java and Tcl zip in Python Python for loops - applying a temporary second name to the same object List slices in Python - 2 and 3 values forms, with an uplifting example Python dictionaries - mutable and immutable keys and values This article Sorting - naturally, or into a different order Sorting people by their names Python - access to variables in the outer scope List Comprehensions in Python Anonymous functions (lambdas) and map in Python Callbacks - a more complex code sandwich Last elements in a Perl or Python list Python - extend v append on a list Copying a reference, or cloning What is a callback? Python is a fabulous language Y104 - Lists and Tuples Embedding more complex code into a named block Shuffling a list - Ruby and Python Collections in Python - list tuple dict and string. Spike solutions and refactoring - a Python example Stepping through a list (or an array) in reverse order List slices in Python - 2 and 3 values forms, with an uplifting example All possible combinations from a list (Python) or array (Ruby) Beware - a=a+b and a+=b are different - Python Arrays of arrays - or 2D arrays. How to program tables. This article Traffic lights in Python Python - fresh examples of all the fundamentals Strings as collections in Python Creating and iterating through Python lists Looking for a value in a list - Python Tektronix 4010 series / Python Tuples for loop - how it works (Perl, PHP, Java, C, etc) Python collections - mutable and imutable Python - extend v append on a list The ternary operator in Python Overloading of operators on standard objects in Python P217 - More than Simple Lists and Hashes! Taking the lead, not the dog, for a walk. How to do multidimensional arrays (or rather lists and hashes) in Perl Take the dog on a lead - do not carry her. Perl references. Not multidimentional arrays - but lists of lists. Much more flexible. Perl! From fish, loaves and apples to money, plastic cards and BACS (Perl references explained) Arrays of arrays - or 2D arrays. How to program tables. Adventure with references to lists and lists of references Finding elements common to many lists / arrays Setting up a matrix of data (2D array) for processing in your program This article Further more advanced Perl examples Just pass a pointer - do not duplicate the data Perl references - $$var and $var notations Autovivification - the magic appearance of variables in Perl Course follow-ups Hash of lists in Perl P208 - Lists in Perl Mapping an array / list without a loop - how to do it in Perl 6 Lots of ways of doing the same thing in Perl - list iteration Taking the lead, not the dog, for a walk. Writing more maintainable Perl - naming fields from your data records Stepping through a list (or an array) in reverse order Dark mornings, dog update, and Python and Lua courses before Christmas $ is atomic and % and @ are molecular - Perl This article Fresh Perl Teaching Examples - part 2 of 3 Iterating over a Perl list and changing all items Finding text and what surrounds it - contextual grep The dog is not in trouble Revision / Summary of lists - Perl Perl - lists do so much more than arrays Perl Socket Programming Examples Out of memory during array extend - Perl Perl - map to process every member of a list (array) Perl ... adding to a list - end, middle, start Filtering and altering Perl lists with grep and map Last elements in a Perl or Python list Perl - a list or a hash? C++ and Perl - why did they do it THAT way? Breaking bread Huge data files - what happened earlier? Queues and barrel rolls in Perl The fencepost problem Splitting the difference Context in Perl Conventional restraints removed Course sizes - beware of marketing statistics Comparison Chart for Perl programmers - list functions Perl for breakfast