Python Lists
Sequence is the most basic information construction inwards Python, Each chemical part of a sequence is assigned a let on - its seat or index. The get-go index is zero, the second index is one, as well as and then forth.
Python has 6 built-in types of sequences, simply the most mutual ones are Lists as well as Tuples.
-----------------------------
The listing is a most versatile datatype available inwards Python which tin locomote written as
a listing of comma-separated values (items) betwixt foursquare brackets. Important thing about a listing is that items inwards a listing need non locomote of the same type.
Examples:
list1 = ['Java', 'Visual Basic', 1997, 2000];
list2 = [10, 20, 30, 40, 50];
list3 = ["a", "b", "c", "d"];
-----------------------------
1) Accessing Values inwards Lists
To access values inwards lists, purpose the foursquare brackets for slicing along amongst the index.
Examples:
abc = ["Selenium", "UFT", "SilkTest", 100, 200, 300];
print (abc);
print (abc[1]);
-----------------------------
2) Updating Lists
You tin update unmarried or multiple elements of lists yesteryear giving the while on the
left-hand side of the assignment operator, as well as you lot tin add together to elements inwards a list
with the append() method.
Examples:
list = ['physics', 'chemistry', 1997, 2000];
print (list);
print (list[2]);
list[2] = 9999;
print (list);
print (list[2]);
-----------------------------
3) Delete List Elements
To take a listing element, you lot tin purpose either the del disputation if you lot know exactly which element(s) you lot are deleting or the remove() method if you lot create non know.
Example:
list1 = ['physics', 'chemistry', 1997, 2000];
print (list1);
del (list1[2]);
print (list1);
-----------------------------
4) Built-in List Functions & Methods / Operations on Python Lists
i) len()
Gives the sum length of the list.
Example:
list = [10, 20, 30, 40, 50];
print (len(list));
ii) max()
Returns especial from the listing amongst max value.
Example:
list = [10, 20, 30, 40, 50];
print (max(list));
iii) min()
Returns especial from the listing amongst 2nd value.
Example:
list = [10, 20, 30, 40, 50];
print (min(list));
-------------------------------
Methods amongst Description
i) append() method
Appends object obj to list
Example:
list = [10, 20, 30, 40, 50];
print(list);
list.append(70);
print(list);
ii) remove() method
Removes chemical part from listing yesteryear chemical part value.
Example:
list = [10, 20, 30, 40, 50];
print(list);
list.remove(50);
print(list);
iii) reverse() method
Reverses elements of listing inwards place
Example:
list = [10, 20, 30, 40, 50];
print(list);
list.reverse();
print(list);
-------------------------------------------------------------
Also Read:
Python Step yesteryear Step Tutorial
1) In Which sequence should We larn Python?
2) Introduction to Python
3) Download & Install Python
4) Variables as well as Data Types inwards Python
5) Python Operators
6) Python Conditional Statements
7) Python Loops...
8) String Handling inwards Python
Sequence is the most basic information construction inwards Python, Each chemical part of a sequence is assigned a let on - its seat or index. The get-go index is zero, the second index is one, as well as and then forth.
Python has 6 built-in types of sequences, simply the most mutual ones are Lists as well as Tuples.
-----------------------------
The listing is a most versatile datatype available inwards Python which tin locomote written as
a listing of comma-separated values (items) betwixt foursquare brackets. Important thing about a listing is that items inwards a listing need non locomote of the same type.
Examples:
list1 = ['Java', 'Visual Basic', 1997, 2000];
list2 = [10, 20, 30, 40, 50];
list3 = ["a", "b", "c", "d"];
-----------------------------
1) Accessing Values inwards Lists
To access values inwards lists, purpose the foursquare brackets for slicing along amongst the index.
Examples:
abc = ["Selenium", "UFT", "SilkTest", 100, 200, 300];
print (abc);
print (abc[1]);
-----------------------------
2) Updating Lists
You tin update unmarried or multiple elements of lists yesteryear giving the while on the
left-hand side of the assignment operator, as well as you lot tin add together to elements inwards a list
with the append() method.
Examples:
list = ['physics', 'chemistry', 1997, 2000];
print (list);
print (list[2]);
list[2] = 9999;
print (list);
print (list[2]);
-----------------------------
3) Delete List Elements
To take a listing element, you lot tin purpose either the del disputation if you lot know exactly which element(s) you lot are deleting or the remove() method if you lot create non know.
Example:
list1 = ['physics', 'chemistry', 1997, 2000];
print (list1);
del (list1[2]);
print (list1);
-----------------------------
4) Built-in List Functions & Methods / Operations on Python Lists
i) len()
Gives the sum length of the list.
Example:
list = [10, 20, 30, 40, 50];
print (len(list));
ii) max()
Returns especial from the listing amongst max value.
Example:
list = [10, 20, 30, 40, 50];
print (max(list));
iii) min()
Returns especial from the listing amongst 2nd value.
Example:
list = [10, 20, 30, 40, 50];
print (min(list));
-------------------------------
Methods amongst Description
i) append() method
Appends object obj to list
Example:
list = [10, 20, 30, 40, 50];
print(list);
list.append(70);
print(list);
ii) remove() method
Removes chemical part from listing yesteryear chemical part value.
Example:
list = [10, 20, 30, 40, 50];
print(list);
list.remove(50);
print(list);
iii) reverse() method
Reverses elements of listing inwards place
Example:
list = [10, 20, 30, 40, 50];
print(list);
list.reverse();
print(list);
-------------------------------------------------------------
Also Read:
Python Step yesteryear Step Tutorial
1) In Which sequence should We larn Python?
2) Introduction to Python
3) Download & Install Python
4) Variables as well as Data Types inwards Python
5) Python Operators
6) Python Conditional Statements
7) Python Loops...
8) String Handling inwards Python