00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys new 00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys new
THE WORLD'S LARGEST WEB DEVELOPER SITE
Jets #23 Shonn Greene Green Stitched NFL Jersey [NFL_New_York_Jets_035] - $20.00 : $18 NBA Cheap Jerseys,Wholesale Basketball Jerseys,Cheap NBA Jerseys, NewCheapJerseysShop.com

Python Tutorial

Python HOME Python Intro Python Get Started Python Syntax Python Comments Python Variables Python Numbers Python Casting Python Strings Python Operators Python Lists Python Tuples Python Sets Python Dictionaries Python If...Else Python While Loops Python For Loops Python Functions Python Lambda Python Arrays Python Classes/Objects Python Inheritance Python Iterators Python Modules Python Dates Python JSON Python RegEx Python PIP Python Try...Except Python Command Input Python String Formatting

File Handling

Python File Handling Python Read Files Python Write/Create Files Python Delete Files

00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys Python MySQL

MySQL Get Started MySQL Create Database MySQL Create Table MySQL InsertJersey Captain Derek Carr Derek Carr MySQL Select MySQL Where MySQL Order By MySQL Delete MySQL Drop Table MySQL Update MySQL Limit MySQL Join

Python MongoDB

MongoDB Get Started MongoDB Create Database Angeles Jersey Dodgers Los Angeles Dodgers Los MongoDB Insert MongoDB Find MongoDB Query MongoDB Sort MongoDB Delete MongoDB Drop Collection MongoDB Update MongoDB Limit

Python Reference

Python Overview Python Built-in Functions Python String Methods Panthers Authentic Carolina Wholesale Jerseys ch Auquality - digiacomo Nfl Cheap Www Jersey Python Dictionary Methods Python Tuple Methods Python Set MethodsJersey Redskins Custom Redskins Jersey Redskins Custom Custom Jersey Jersey Redskins Custom Custom Redskins Custom Redskins Jersey Python File Methods Python Keywords

Module Reference

Random Module Requests Module

Python How To

Remove List Duplicates Reverse a String

Python Examples

Python Examples Python Exercises Python Quiz To Sale Football Kit Barcelona 2016 Discounts Up 69

00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys new


Python Collections (Arrays)

There are four collection data types in the Python programming language:

  • List is a collection which is ordered and changeable. Allows duplicate members.
  • Tuple is a collection which is ordered and unchangeable. Allows duplicate members.
  • Set is a collection which is unordered and unindexed. No duplicate members.
  • Dictionary is a collection which is unordered, changeable and indexed. No duplicate members.

When choosing a collection type, it is useful to understand the properties of that type. Choosing the right type for a particular data set could mean retention of meaning, and, it could mean an increase in efficiency or security.

List

A list is a collection which is ordered and changeable. In Python lists are written with square brackets.

Example

Create a List:

thislist = ["apple", "banana", "cherry"]
print(thislist)
Run example »

Access Items

You access the list items by referring to the index number:

Example

Print the second item of the list:

thislist = ["apple", "banana", "cherry"]
print(thislist[00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys 1])
Run example »

Change Item Value

To change the value of a specific item, refer to the index number:

Example

Change the second item:

thislist = ["apple", "banana", "cherry"]
thislist[1] = "blackcurrant"
print(thislist)
Run example »


Loop Through a List

You can loop through the list items by using a for loop:

Example

Print all items in the list, one by one:

thislist = ["apple", "banana", "cherry"]
for x in thislist:
  print(x)
Run example »

You will learn more about 00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys for loops in out Python For Loops Chapter.


Check if Item Exists

To determine if a specified item is present in a list use the in keyword:

Example

Check if "apple" is present in the list:

thislist = ["apple", "banana", "cherry"]
00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys if "apple" in thislist:
  print("Yes, 'apple' is in the fruits list")
Run example »

List Length

To determine how many items a list has, use the len()Jerseys Gear Giants Dallas Cod Game New Power Selling Patriots Jerseys White York 2018 Cowboys method:

Example

Print the number of items in the list:

thislist = ["apple", 00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys "banana", "cherry"]
print(len(thislist))
Run example »

Add Items

To add an item to the end of the list, use the append()Jersey Elite Patriots Elite Jersey Patriots Elite Patriots method:

00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys Example

Using the append() method to append an item:

thislist = ["apple", "banana", "cherry"]
thislist.append("orange")
print(thislist)
Run example »

To add an item at the specified index, use the insert() method:

Example

Insert an item as the second position:

thislist = ["apple", "banana", "cherry"]
thislist.insert(1, "orange")
print(thislist)
Run example »

Remove Item

00 Shonn wholesale Jerseys Jerseys 20 com Nba cheap - Greene nfl 18 Green Newcheapjerseysshop Stitched Jets 23 Jersey 035 Cheap Nfl york Basketball jets Jerseys There are several methods to remove items from a list:

Example

The remove() method removes the specified item:

thislist = ["apple", "banana", "cherry"]
thislist.remove("banana")
print(thislist)
Run example »

Example

The pop() method removes the specified index, (or the last item if index is not specified):

thislist = ["apple", "banana", "cherry"]
thislist.pop()
print(thislist)
Run example »

Example

The del keyword removes the specified index:

thislist = ["apple", "banana", "cherry"]
del thislist[0]
printBaltimore Ravens Jersey Reed Ed(thislist)
Run example »

Example

The del keyword can also delete the list completely:

thislist = ["apple", "banana", "cherry"]
del thislist
Run example »

Example

The clear() method empties the list:

thislist = ["apple", "banana", "cherry"]
thislist.clear()
print(thislist)
Run example »

Copy a List

You cannot copy a list simply by typing list2 = list1, because: list2 will only be a reference to list1, and changes made in list1 will automatically also be made in list2.

There are ways to make a copy, one way is to use the built-in List method copy().

Example

Make a copy of a list with the copy() method:

thislist = ["apple", "banana", "cherry"]
mylist = thislist.copy()
print(mylist)
Run example »

Another way to make a copy is to use the built-in method list().

Example

Make a copy of a list with the list() method:

thislist = ["apple", "banana", "cherry"]
mylist = list(thislist)
print(mylist)
Run example »

The list() Constructor

It is also possible to use the list() constructor to make a new list.

Example

Using the list() constructor to make a List:

thislist = list(("apple", "banana", "cherry")) # note the double round-brackets
print(thislist)
Run example »

List Methods

Python has a set of built-in methods that you can use on lists.

Method Description
append() Adds an element at the end of the list
clear() Removes all the elements from the list
copy() Returns a copy of the list
count() Returns the number of elements with the specified value
extend() Add the elements of a list (or any iterable), to the end of the current list
index() Returns the index of the first element with the specified value
insert() Adds an element at the specified position
pop() Removes the element at the specified position
Nfl Tennessee Vintage 36 Steve Football Titans Jersey Champion Mcnair Removes the item with the specified value
reverse() Reverses the order of the list
sort() Sorts the list

Test Yourself With Exercises

Exercise:

Print the second item in the fruits list.

fruits = ["apple", 
"banana",
"cherry"] print()

Start the Exercise