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zip in Python

Zipping has become synonymouse with compressing data in programming terms; originally the use of the word in that sense came from zipping up a bag so that a whole lot of contents were held together, but these days the compression (pushing everything into the bag) is kind of expected.

Python's zip function takes us back to the older meaning - it allows two or more lists of the same length to be combined into a list of tuples, also with the same number of members.

For example, I may have two lists:
  first = [4,27,46,51]
  place = ["Melksham","Chippenham","Swindon","Didcot"]

and if I zip them together
  togeths = zip(first,place)
  print togeths

I'll get:
  [(4, 'Melksham'), (27, 'Chippenham'), (46, 'Swindon'), (51, 'Didcot')]

Image from Morguefile - attribution not required, but freely offered with thanks for the resource.

(written 2012-07-05, updated 2012-07-14)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Y111 - Python - More on Collections and Sequences
  [4442] Mutable v Immuatble objects in Python, and the implication - (2015-02-24)
  [4398] Accessing variables across subroutine boundaries - Perl, Python, Java and Tcl - (2015-01-18)
  [3439] Python for loops - applying a temporary second name to the same object - (2011-09-14)
  [3348] List slices in Python - 2 and 3 values forms, with an uplifting example - (2011-07-06)
  [3150] Python dictionaries - mutable and immutable keys and values - (2011-01-29)
  [2996] Copying - duplicating data, or just adding a name? Perl and Python compared - (2010-10-12)
  [2920] Sorting - naturally, or into a different order - (2010-08-14)
  [2894] Sorting people by their names - (2010-07-29)
  [2718] Python - access to variables in the outer scope - (2010-04-12)
  [1873] List Comprehensions in Python - (2008-11-06)
  [1869] Anonymous functions (lambdas) and map in Python - (2008-11-04)
  [1310] Callbacks - a more complex code sandwich - (2007-08-19)
  [1304] Last elements in a Perl or Python list - (2007-08-16)
  [899] Python - extend v append on a list - (2006-10-20)
  [633] Copying a reference, or cloning - (2006-03-05)
  [386] What is a callback? - (2005-07-22)
  [61] Python is a fabulous language - (2004-09-24)


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