{"id":2934,"date":"2018-03-10T05:17:17","date_gmt":"2018-03-10T05:17:17","guid":{"rendered":"http:\/\/truelogic.org\/wordpress\/?p=2934"},"modified":"2018-03-10T12:33:33","modified_gmt":"2018-03-10T12:33:33","slug":"python-2-7-fundamentals-collections-tuples","status":"publish","type":"post","link":"https:\/\/truelogic.org\/wordpress\/2018\/03\/10\/python-2-7-fundamentals-collections-tuples\/","title":{"rendered":"Python 2.7 – Fundamentals – Collections – Tuples"},"content":{"rendered":"

Tuples are very similar to lists, except that they are immutable. In other words, once a tuple is created you cannot modify it in any way. Tuples are enclosed in normal brackets and the items separated by commas. Items can be of mixed data types. Some examples are shown below:<\/p>\n

\"\"<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Operators<\/strong><\/h3>\n

The following operators are available for tuples:<\/p>\n

    \n
  1. [] – index operator.<\/li>\n
  2. \u00a0+ – concatenation<\/li>\n
  3. * – repetition<\/li>\n
  4. [:] \u00a0– slicing<\/li>\n
  5. \u00a0in – membership<\/li>\n
  6. len – length (this is a function not really an operator)<\/li>\n<\/ol>\n

    We will look at the above in more detail.<\/p>\n

    [] – index operator<\/strong><\/p>\n

    Tuples are collections of data types. So to access individual items in a tuple we use the index operator. The lowest index value is zero which represents the first item and the highest index value is the length of the tuple minus one.<\/p>\n

    \"\"<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    Trying to access an index beyond the length of the tuple gives an error.<\/p>\n

    + – concatenation<\/strong><\/p>\n

    This operator lets you join two tuples together.<\/p>\n

    \"\"<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    *- repetition<\/strong><\/p>\n

    This repeats the tuple x number of times.<\/p>\n

    \"\"<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    [:] slicing<\/strong><\/p>\n

    The index operator lets you extract one item from the tuple. The slicing operator lets us extract multiple items from a tuple. The operator takes two numbers [x:y] where x is the starting index and y is the ending index. Note that the ending index is not inclusive eg. if you try print name[1:3] it will extract character at index 1 and then stop at index 2.<\/p>\n

    The slicing operator has various permutations and combinations as shown below:<\/p>\n