python list and tuples 4 | Learn With Pirates

Chapater 4: Python List And Tuples

List In Python

Python list is used to store a set of values of any data type.

a = [5,6,7,8,] # Create a list with []

Output

[5, 6, 7, 8]

List Indexing

a = [5,6,7,8,]

# Access using index using a[0], a[1],

print(a[3])

Output

8

the list is an index at 0 to the end of the list

h = [77, "PIrates", True, 7.7] # create with any Data Type

print(h)

Output

[77, 'PIrates', True, 7.7]

Slicing In list:

# slicing in list

word = ["Pirates", "Learn", 66, "like", "tom"]

print(word[0:3])

print(word[-3:])

Output

['Pirates', 'Learn', 66] [66, 'like', 'tom']

List Methods

l1 = [7, 8, 9, 10, 15, 16,]

print(l1)

l1.sort() # sorts the list

print(l1)

l1.reverse() # reverses the list

print(l1)

l1.append(45) # adds 45 at the end of the list

print(l1)

l1.insert(2, 199) # inserts 199 at index 2

print(l1)

l1.pop(2) # removes element at index 2

print(l1)

l1.remove(10) # removes 21 from the list

print(l1)

Output

[7, 8, 9, 10, 15, 16] [7, 8, 9, 10, 15, 16] [16, 15, 10, 9, 8, 7] [16, 15, 10, 9, 8, 7, 45] [16, 15, 199, 10, 9, 8, 7, 45] [16, 15, 10, 9, 8, 7, 45] [16, 15, 9, 8, 7, 45]

Tuples In Python

t = (1, 2, 4, 5) # Creating a tuple using ()

# How to create singal element tuple

t1 = () # Empty tuple

t1 = (7) # Wrong way to declare a Tuple with Single element

t1 = (7,) # Tuple with Single element

print(t1)

print(t[3]) # indexing tuple

output

5

tuples is an immutable data type in python.

t = (1, 2, 4, 5)

t[0] =55

print(t)

Output

TypeError: 'tuple' object does not support item assignment

Note: Once you define tuples that can not be altered or manipulated  

Tuples methods

# consider this tuple

t = (1, 2, 4, 5, 6, 7,)

print(t.count(4)) #return number of time 4 in tuple

print(t.index(6)) #return index value of element

Output

1 4

Termination

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Python String 3 | Learn With Pirates

Chapter 3: Python String

String is one data type in python

How to identify String

The string is a sequence of character enclose in quotes

p= "pirates"

How to Written String:

• Single quotes
• Double quotes
• Triple quotes

s= 'pirates'     #Single quotes

p= "pirates"     #Double quotes

q= '''pirates''' #Triple quotes

print(s,p,q)

Output

pirates pirates pirates

String Slicing

Main String:

name = "Pirates" #0123456

A String in Python can be sliced for getting a part of the string.
Example For:

name = "Pirates" #0123456

print(name[0:3]) # return 0 to 3 character

print(name[1:3]) # return 1 to 3 character

Output

Pir ir

String index is started counting at 0 to (n-1) in python. 

How work of slice in the string:
slicing= name[int_start: int_end]

Negative indexing:
String index is started negative indexing at -1  to (n-1) in python.

name = "Pirates" #0123456

print(name[-5:-1]) #return same as [2:6]

print(name[2:6])

Output

rate rate

Slicing with skip value:

name = "Pirates" #0123456

print(name[0:6:4]) # return 0 and 4 index

Output

Pt

we can slice whatever we gain from a string.

Advance Slicing Techniques:

name = "Pirates" #0123456

print(name[:6]) # advance Slicing

print(name[0:]) # advance Slicing

Output

Pirate Pirates

Sting Functions:

Main String:

timeline = "Learn with pirates. Hey readers i hope you enjoy this tutorial"

len() function: 
This function returns a length of a string.

timeline = "Learn with pirates. Hey readers i hope you enjoy this tutorial"

print(len(timeline)) # length of timeline

Output

62

string.endwith(word)
this searches your word in the string if the word is present is give True, else False.

timeline = "Learn with pirates. Hey readers i hope you enjoy this tutorial"

print(timeline.endswith("rial")) # True Or False

Output

True

string.count("L")
this function return string total number of character of string.

timeline = "Learn with pirates. Hey readers i hope you enjoy this tutorial"

print(timeline.count("L")) # chracter count L in timeline

Output

1

string.capitalise()
return first character capital of string.

timeline = "Learn with pirates. Hey readers i hope you enjoy this tutorial"

print(timeline.capitalize()) # capitalize first word

Output

Learn with pirates. hey readers i hope you enjoy this tutorial

srinng.find(word)
This is work as a search option. it searches for a word a given answer.

timeline = "Learn with pirates. Hey readers i hope you enjoy this tutorial"

print(timeline.find("readers")) # which index

Output

24

string.replace(old_word,new_word)
this function is use for replace word in to string

timeline = "Learn with pirates. Hey readers i hope you enjoy this tutorial"

print(timeline.replace("Learn", "dO"))# return replace Learn with do

Output

dO with pirates. Hey readers i hope you enjoy this tutorial

Escape Sequence Characters

Identify
a sequence of characters after '\' backslash
Example:

# Escape Sequence Character

'''\n for new line

\t for Tab

\\ backslash

\' for singal quote

'''

Escape = "Pirates are Lead world\'s.\ngoogle\tis\n\\amazing"

print(Escape)

'''Output

Pirates are Lead world.

google is

\amazing'''

Termination

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Python Variable and Data Type 2 | Learn With Pirates

Chapter 2: Python variable and Data Type

Variable is the name of the memory location of the program element.

Example For 

a = 77 #Integer

b = "Pirates" #String

c = 17.0 #float

Data Types

There some data types of python have listed below.

Integer

String

Float

Booleans

None

python is intelligent for identity which data type is for what

like, 

if you write 

a = 77 #identifies as Integer

b = "Pirates" #identifies as String

c = 17.0 #identifies as float

There are some Rule to define a variable 

• Variable Content alphanumeric, alphabet, underscore
• a variable name can only start with alphabets and underscore
• a variable name can not start with numbers
• space can not contain a variable name.

Operates in Python

In python, we have some common operators.

#arithmetic operators +, -, *, %, /,etc.

#assignment operates =, +=, -=, etc.

#comparison operator ==, !=, <, >, etc.

#logical operator and, or, not.

type() Function

type() function is use for find data type for variable.

a= 50

b= "PIrates"

c= 30.5

print(type(a))

print(type(b))

print(type(c))

Output

<class 'int'>

<class 'str'>

<class 'float'>

Type Casting

numeric variable is converteble like 

a= 50

b= "50"

c= 50.0

print(type(a))

print(type(b))

print(type(c))

Output

<class 'int'>

<class 'str'>

<class 'float'>

input() Function

input() function is used for taking input from the user. every input gives use is by default convert into a string at the output.

a = input("enter a date of your birthdate: ")

print("your birthdate is " +a)

Output

enter a date of your birthdate: 4

your birthdate is 4

NOTE: The user input is a convert to string even you enter the number value. 

Read Chapter 3:

Python String Chapter 3

Read Chapter 1:

Python Introduction Chapter 1

Termination:

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Python Introduction | Learn With Pirates

Python For Beginner

Chapter 0: Introduction 

What is python?

Python is one of the most popular languages for programming. Python is invented by Guido Van, released in 1991.

 
These are some use of python:
Software development
Mathematics
System scripting
Web development

Some capability of python:

Python can use in web application development
Python can use in artificial intelligent
Python can connect to the database for the application backend

Why do you use python?

Python is platform-independent
It has very simple syntax and structure
With python, the programmer develops application very easy rather then other.

Chapter 1: Python Overview

Python syntax

print(“Hello World”)

Set up the environment for developing amazing things:
The download python for your os

Install with this command:

 

Check the python version with this command:

Write your first code:

 

 

Note: You use whatever os for this task-it not mandatory to use Linux. 

Here you need one IDE for write python code:

Guide: Download Visual Studio

Comment Python:

A comment is used to write instruction or anything that not going to execute.

Define In code with 

#comment : For singal line Comment

''' comment ''' : For multiline Comment

# This is a singalline comment

''' This

is

a

multiline

comment '''

Module:

The module it a specific task code. That we use as an importing in our program.

Module Types:

Built-In Module: This is a preBuilt module in python. They did not need to install. like os, etc.
 

External Module: This is written by someone to make the task easy for a specific task. They need to import and install. like tensorflow, etc.

import os

print("Hello Pirates")

Using python as a calculator:

You can use Python as calculator as you see into code

print(3+4)

print(3-2)

print(3/2)

print(4%2)

output

7

1

1.5

0

 

Termination

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