zip in Python

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

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