introduction to python in english presentation file

Welcome
Congratulations for deciding to participate
in a 7 days of Introduction to Python
Course.
In this course you will learn the basics of
programming using Python.

Course Introduction
This course is designed for beginners and
intermediate who want to learn python
programming language.
In this course the topics are broken down
into 7 days, where each day contains several
topics with easy-to-understand
explanations, real-world examples, many
hands on exercises and a final project.

Why Python?
Python is a programming language which is
very close to human language and because
of that it is easy to learn and use.
Python is used by various industries and
companies (including Google).
It has been used to develop web
applications, desktop applications, system
administration, and machine learning
libraries.

Installing Python
 To run a python script you need to install python.
Let's download python from
https://www.python.org/.

Installing VS Code
 Visual Studio Code is a code editor (much like
any other editor like Notepad) helpful in writing
and editing codes.
 We download it from here
https://code.visualstudio.com/

Basic Data-types
 Boolean
A boolean data type is either a True or False value. T and F
should be always uppercase.
 Integers (default for numbers)
z = 5
 Floats
x = 3.1416
 Complex Numbers
x = 1+2j

Basic Data-types
 Strings
• Can use “ ” or ‘ ’ to specify strings
• a = “Nepal”
• b = ‘Kantipur Engineering College’
• “abc” == ‘abc’
• Use “ ” if ’ already in string eg: “matt’s”
• Use triple double-quotes for multi-line strings or strings
than contain both ‘ and “ inside of them:
“““a‘b“c”””

Checking Data Types
 To check the data type of certain data/variable we
use the type function.
>>> type(15)
<class ‘int’>
>>> type(3.14)
<class ‘float’>
>>> type(1+2j)
<class ‘complex’>
>>> str = “Hello World”
>>> type(str)
<class ‘string’>

Naming Rules
 Names are case sensitive and cannot start with a
number.
 They can contain letters, numbers, and
underscores.
 bob Bob _bob _2_bob_ bob_2 BoB
 There are some reserved words:
and, assert, break, class, continue, def, del, elif, else,
except, exec, finally, for, from, global, if, import, in, is,
lambda, not, or, pass, print, raise, return, try, while
 Can’t do this
• for = 12 #for is a reserved word

Assignment
 Assign value to variables
>>> x = 2
 You can assign to multiple names at the same time
>>> x, y = 2, 3
>>> x
2
>>> y
3
 This makes it easy to swap values
>>> x, y = y, x
 Assignments can be chained
>>> a = b = x = 2

Mathematical Operators
 Exercise: Find an Euclidian distance between (2, 3) and
(10, 8)

Mathematical Operators
 Exercise: For a given temperature in celsius stored in
variable ‘t_c’, get the Fahrenheit temperature in ‘t_f’ and
display result.
• Let t_c = 100
• ans = 212

Checking Data Types
 Exercise: What would be the data-type of?
>>> a = 4/3
>>> type(a)
>>> n = 4//3
>>> type(a)
>>> num = ‘2080’
>>> type(num)

Type Casting
 Converting one data type to another data type.
 We use int(), float(), str()
>> # float to int
>> gravity = 9.81
>> print(int(gravity))

Type Casting
 When we do arithmetic operations string numbers
should be first converted to int or float otherwise it
will return an error.
>> #str to int or float
>> num_str = '10.6‘
>> print('num_int', int(num_str))
>> print('num_float', float(num_str))

Comparison Operators
 In programming we compare values, we use
comparison operators to compare two values. We
check if a value is greater or less or equal to other
value.
>> 2 == 2
>> 3.14 == 3.1416
>> print(123 == ‘123’)
>> print(123 == int(‘123’))
>> a = ‘mango’
>> b = ‘orange’
>> a == b
>> a < b What does this show?

Logical Operators
 Logical operators are used to combine conditional
statements:
>> 2 == 2 and 2 < 4
True
>> print()
>>
>> a = ‘mango’
>> b = ‘orange’
>> a == b
>> a < b What does this show?

Conditionals
 In python the key word if is used to check if a
condition is true and to execute the block code.
Remember the indentation after the colon.
a = 10
if a > 3:
print(a, “is greater than 3”)
 if else
a = 3
if a > 0:
print(a, “is positive number”)
else:
print(a, “is negative”)

Conditionals
 if elif else
a = 3
if a > 0:
print(a, “is positive number”)
elif a < 0:
print(a, “is negative number”)
else:
print(a, “is zero”)

Operators and Conditionals
 Exercise:
 How do you check if a number is between 5 and 10
inclusive?
Note: Use if statement here
>>> if condition_1 and condition_2:
... choice_1
>>> else:
... choice_2
>>>

Operators and Conditionals
 Exercise:
 How do you check if a number is even or not using
python?
Note: Use if statement here
>>> if condition:
... choice_1
>>> else:
... choice_2
>>>

Program for the Day
Calculate Electricity Bill (15A)
KWh Minimum Charge Charge per KWh
0 to 20 50 4.00
21 to 30 75 6.50
31 to 50 75 8.00
51 to 100 100 9.50
101 to 250 125 9.50
250 above 175 11
Ans: 2330 for 250 units

Loops
 In programming we also do lots of repetitive tasks. In order
to handle repetitive task programming languages use loops.
Python programming language also provides the following
types of two loops:
• while loop
• for loop

While Loop
count = 0
while count < 5:
print(count)
count = count + 1 #prints from 0 to 4

for Loop
# syntax
for iterator in range(start, end, step):
#loop statements
for i in range(1,10,1):
print(i)

for Loop
num_list = [1,2,3,4,5]
for num in num_list:
print(num)
it_companies = ['Facebook', 'Google', 'Microsoft',
'Apple', 'IBM', 'Oracle',
‘Amazon‘]
for company in it_companies:
print(company)

Program for the Day
Student Grading SEE and NEB

Program for the Day
 For a given students’ mark in percentage, display
letter grade for each student.
marks = 90
Your code should display “Outstanding”

Program for the Day
 For a list of students’ marks in percentage, display
letter grade for each student.
marks = [95, 42, 78, 45, 89, 90]
Use for loop

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