Learn Python

Looping in a list is used to access every element in the list. There are two tyes of looping. Normal for-in loop as specified in line 8 & 9. Range of length loop as specified in line 13 & 14. Try Yourself: #List looping example   colors_list = ["red", "green", "yellow", "violet"] months_list =  ["Jan", "Feb", "Sep", "Mar"]   print "Colours in the list: " # Normal Looping for i in range(len(colors_list)):     print(colors_list[i])   # Range Looping print "Months in the list: " for month in months_list:     print(month)         The lines 8 & 9 are like normal for loop; where each element in the list are accessed using the index value. The lines 13 & 14 are special case; where every elements in the list of months_list is taken. The iteration stops when all the elements in the list are exhausted.

One of the basic data structures in Python is sequences. There are six built-in types of sequence - strings, Unicode strings, lists, tuples, buffers, and xrange objects. The most common are lists and tuples.  A list is an ordered set of values, where each value is identified by an index. The values in the list are known as elements. Each element of a sequence is assigned with a number - its position or index. The first index is zero, second is one and so forth. Creation and Accessing List: The list can be created by putting values separated by commas between square brackets []. List is one of the most freuently used and very versatile data type used in Python.  Syntax for List:                <List_name> = [<Value_1>,<Value_2>,........,<Value_N>] NOTE:  Nested lists are also acceptable. List Operations: Two operations + and * is allowed in list. + for concatenation ...