Python variable assignments | JNTUA | R19 | UNIT 1

Apr 7, 20210 likes162 views

This document provides an overview of Python programming concepts including variables, assignment statements, keywords, order of operations, string operations, functions, and type conversions. It covers defining and assigning variables, rules for variable names, order of mathematical operations, concatenating and repeating strings, why functions are used to organize code, types of functions including built-in and user-defined, and converting between string, integer, and float data types. The document appears to be lecture notes for a Python programming course.

Python Programming
Unit – I (Part II)
(Lecture 4)
Variables,
Assignment
Statements

Lecture 4
Assignment
statements
Comments
Key Words
Order of
Operations
Script Mode
String Operations
Variables, Assignment Statements
Lecture 5

Lecture 4
Assignment
statements
Key Words
Script Mode
Variables, Assignment Statements

if
import
in
is
lambda
Nonlocal
with
yield
except
finally
for
from
global
raise
try
while
class
continue
def
del
elif
pass
else
return
and
as
assert
async
await
break
not
or
35
key
words
Started
with
capitals
True
False
None
Key Words

Assignment statements
• A variable is a quantity that may change
within the context of a mathematical
problem or expression.
• In python a variable is created by assign
a value to it.

Assignment statements
a = 10
b = 20
c = a + b
word = “hello”
num = 20
num = 10
NUM = 20
nUM = 30
Num = 40
All are different

• Use letters
• Use numbers
with letters
• Use ‘_’ for
long names
Assignment statements
a = 5  a variable
A = 6  a variable
(note : A & a are different variables)
A 1 = 10  a variable
my_name = “Raja”  a variable

• Don’t start
with number
• Don’t use
keywords as
variable
names
Assignment statements
2a = 100  syntax error
a2 = 100  is a variable
if = 5  is a syntax error
If = 5  If is a variable
True = 6  is a syntax error
true = 6  true is a variable

• Contains a
sequence of
statements
• Results appear
one at a time
Script Mode

Python Programming
Unit – I (Part II)
(Lecture 5)
Variables,
Assignment
Statements

Comments
Order of
Operations
String Operations
Variables, Assignment Statements
Lecture 5

• An expression is a combination of
values, variables, and operators.
• Consider a=1, b=5, c=6, d=3.
Evaluate b – a * c / d + 10
Order of Operations

+ is used for
combining
String Operations
“Hello” + “world”  Hello world
a = “welcome”
b = “to”
c = “python”
d = a + b + c  “Welcome to python”

* is used for
Repeating
String Operations
“Hi ” * 3  “Hi Hi Hi”
a = “hello ”
b = a*2  “hello hello”

Comments
a = 10 # a value assigned
b = 20 # b value assigned
c = a + b # sum of a and b assigned to c
# symbol is used to add comments

Python Programming
Unit – I (Part III)
(Lecture 6)
Functions

Lecture 6
Why Functions?
How to use
Functions?
Types of functions
Functions
Types Conversions

Why Functions?
Function:
Statement 3
Statement 4
Statement 5
Statement 6
Program:
Statement 1
Statement 2
Statement 3
Statement 4
Statement 5
Statement 6
Statement 7
Statement 3
Statement 4
Statement 5
Statement 6
….
….

Why Functions?
Program (without
functions):
Statement 1
Statement 2
Statement 3
Statement 4
Statement 5
Statement 6
Statement 7
Statement 3
Statement 4
Statement 5
Statement 6
….
….
Program (with
functions):
Statement 1
Statement 2
Call function
Statement 7
Call function
….
….

Function:
Statement 3
Statement 4
Statement 5
Statement 6
….
….
Program:
Statement 1
Statement 2
Call function
Statement 7
Call function
….
….
Executed
How to use Functions?

Types of functions
1. Built-in functions
2. User defined functions

Types of functions
1. Built-in functions

Types of functions
2. User defined functions
def function_name (arguments):
statement 1
statement 2
statement 3
…

Types Conversions
a = “10” string
int(a) is 10  converted to integer
float(a) is 10.0  converted to float
b = 10.568  float
str(b) is “10.568”  converted to string

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1. Python Programming Unit – I (Part II) (Lecture 4) Variables, Assignment Statements

2. Lecture 4 Assignment statements Comments Key Words Order of Operations Script Mode String Operations Variables, Assignment Statements Lecture 5

3. Lecture 4 Assignment statements Key Words Script Mode Variables, Assignment Statements

4. if import in is lambda Nonlocal with yield except finally for from global raise try while class continue def del elif pass else return and as assert async await break not or 35 key words Started with capitals True False None Key Words

5. Lecture 4 Assignment statements Key Words Script Mode Variables, Assignment Statements

6. Assignment statements • A variable is a quantity that may change within the context of a mathematical problem or expression. • In python a variable is created by assign a value to it.

7. Assignment statements a = 10 b = 20 c = a + b word = “hello” num = 20 num = 10 NUM = 20 nUM = 30 Num = 40 All are different

8. • Use letters • Use numbers with letters • Use ‘_’ for long names Assignment statements a = 5  a variable A = 6  a variable (note : A & a are different variables) A 1 = 10  a variable my_name = “Raja”  a variable

9. • Don’t start with number • Don’t use keywords as variable names Assignment statements 2a = 100  syntax error a2 = 100  is a variable if = 5  is a syntax error If = 5  If is a variable True = 6  is a syntax error true = 6  true is a variable

10. Lecture 4 Assignment statements Key Words Script Mode Variables, Assignment Statements

11. • Contains a sequence of statements • Results appear one at a time Script Mode

12. Lecture 4 Assignment statements Key Words Script Mode Variables, Assignment Statements

13. Python Programming Unit – I (Part II) (Lecture 5) Variables, Assignment Statements

14. Lecture 4 Assignment statements Comments Key Words Order of Operations Script Mode String Operations Variables, Assignment Statements Lecture 5

15. Comments Order of Operations String Operations Variables, Assignment Statements Lecture 5

16. • An expression is a combination of values, variables, and operators. • Consider a=1, b=5, c=6, d=3. Evaluate b – a * c / d + 10 Order of Operations

17. Rules of precedence

18. Comments Order of Operations String Operations Variables, Assignment Statements Lecture 5

19. + is used for combining String Operations “Hello” + “world”  Hello world a = “welcome” b = “to” c = “python” d = a + b + c  “Welcome to python”

20. * is used for Repeating String Operations “Hi ” * 3  “Hi Hi Hi” a = “hello ” b = a*2  “hello hello”

21. Comments Order of Operations String Operations Variables, Assignment Statements Lecture 5

22. Comments a = 10 # a value assigned b = 20 # b value assigned c = a + b # sum of a and b assigned to c # symbol is used to add comments

23. Comments Order of Operations String Operations Variables, Assignment Statements Lecture 5

24. Python Programming Unit – I (Part III) (Lecture 6) Functions

25. Lecture 6 Why Functions? How to use Functions? Types of functions Functions Types Conversions

26. Why Functions? Function: Statement 3 Statement 4 Statement 5 Statement 6 Program: Statement 1 Statement 2 Statement 3 Statement 4 Statement 5 Statement 6 Statement 7 Statement 3 Statement 4 Statement 5 Statement 6 …. ….

27. Why Functions? Program (without functions): Statement 1 Statement 2 Statement 3 Statement 4 Statement 5 Statement 6 Statement 7 Statement 3 Statement 4 Statement 5 Statement 6 …. …. Program (with functions): Statement 1 Statement 2 Call function Statement 7 Call function …. ….

28. Lecture 6 Why Functions? How to use Functions? Types of functions Functions Types Conversions

29. Function: Statement 3 Statement 4 Statement 5 Statement 6 …. …. Program: Statement 1 Statement 2 Call function Statement 7 Call function …. …. Executed How to use Functions?

30. Lecture 6 Why Functions? How to use Functions? Types of functions Functions Types Conversions

31. Types of functions 1. Built-in functions 2. User defined functions

32. Types of functions 1. Built-in functions

33. Types of functions 1. Built-in functions 2. User defined functions

34. Types of functions 2. User defined functions def function_name (arguments): statement 1 statement 2 statement 3 …

35. Lecture 6 Why Functions? How to use Functions? Types of functions Functions Types Conversions

36. Types Conversions a = “10” string int(a) is 10  converted to integer float(a) is 10.0  converted to float b = 10.568  float str(b) is “10.568”  converted to string

37. Lecture 6 Why Functions? How to use Functions? Types of functions Functions Types Conversions

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