Python Lists

Python Lists, Creating Lists, Accessing Values in Lists, Updating Lists, Delete List Elements, and Built-in List Functions and Methods.

The sequence is the most basic data structure in Python, Each element of a sequence is assigned a number – its position or index. The first index is zero, the second index is one, and so forth.

Python has six built-in types of sequences, but the most common ones are Lists and Tuples.
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The list is the most versatile datatype available in Python which can be written as a list of comma-separated values (items) between square brackets. The important thing about a list is that items in a list need not be of the same type.

Example:

list1 = [10, 20, 30, 40, 50]
list2 =[19.23, 20.45, 5.678, 9.86]
list3 = [“Java”, “Python”, “JavaScript”, “VBScript”]
list4= [True, False, False, None]
list5 =[“Python”, “Java”, 10, 10.234, True]

Print Lists

print (list1)
print (list2)
print (list3)
print (list4)
print (list5)

Print a List line by Line

list1 =[“Python”, “Java”, 10, 10.234, True]

print(list1)
print(“”)

for i in list1:
print (i)

1. Accessing Values in Lists

To access values in lists, use the square brackets for slicing along with the index.

Examples:

abc = [“Selenium”, “UFT”, “SilkTest”, 100, 200, 300]
print (abc)
print (abc[1])

2. Updating Lists

You can update single or multiple elements of lists by giving the slice on the left-hand side of the assignment operator, and you can add elements in a list with the append() method.

Example:

list = [‘physics’, ‘chemistry’, 1997, 2000]

print (list)
print (list[2])
list[2] = 9999
print (list);
print (list[2])

3. Delete List Elements

To remove a list element, you can use either the del statement if you know exactly which element(s) you are deleting or the remove() method if you do not know.

Example:

list1 = [‘physics’, ‘chemistry’, 1997, 2000]

print (list1)
del (list1[2])
print (list1)