The document provides an overview of Python variables, identifiers, keywords, and various types of operators including arithmetic, comparison, assignment, logical, bitwise, and membership operators. It explains the rules for defining identifiers and the significance of comments in code. Additionally, it touches on the purpose of comments in enhancing code readability for both the original author and other programmers.

2. Content
Variables
 Keywords
 Identifiers
 Operators
 Comments

3. A variable in Python represents an entity whose
value can change as and when required.
Conceptually, it is a memory location which holds
the actual value.
For Ex-X=5 (Where the type of x is int )
Variable Value

5. Python has a set of keywords that are reserved
words that cannot be used as variable names,
function names, or any other identifiers.

6. if elif
True None False
Break AND Continue
Assert Await
finally

7. Identifiers
Python identifiers are user-defined names
to represent a variable, function, class,
module or any other object.
Where “first” is
an identifier
Where “sum” is
an identifier
Ex -1
Class first
Ex-2
def sum()

8. Rules for
writing
identifiers
2 It can be combination of
uppercase and lowercase letters,
digits or an underscore(_).
1 An identifier can not start with
digit. So while variable1 is valid,
1variable is not valid.
3 We can’t use special symbols
like !, #, @, %, $ etc in our
identifier.
4 It can be of any length.

9. Arithmetic Operators
Comparison Operators
Assignment Operators
Logical Operators
Bitwise Operators
Membership Operators
Identity Operators
Types of Operator

10. Arithmetic Operators
Operator Name Example
+ Addition x + y
- Subtraction x - y
* Multiplication x * y
/ Division x / y
% Modulus x % y
** Exponentiation x ** y
// Floor division x // y

11. Assignment Operators
Operator Example Same As
= x = 5 x = 5
+= x += 3 x = x + 3
-= x -= 3 x = x - 3
*= x *= 3 x = x * 3
/= x /= 3 x = x / 3
%= x %= 3 x = x % 3
//= x //= 3 x = x // 3
**= x **= 3 x = x ** 3
&= x &= 3 x = x & 3

12. Comparison Operators
Operator Name Example
== Equal x == y
!= Not equal x != y
> Greater than x > y
< Less than x < y
>= Greater than
or equal to
x >= y
<= Less than or
equal to
x <= y

13. Logical Operators
Operator Description Example
and
Returns True if
both statements
are true
x < 5 and x < 10
or
Returns True if
one of the
statements is
true
x < 5 or x < 4
not
Reverse the
result, returns
False if the
result is true
not(x < 5 and x <
10)

14. Identity Operators
Operator Description Example
is
Returns True if
both variables
are the same
object
x is y
is not
Returns True if
both variables
are not the
same object
x is not y

15. Bitwise Operators
Operator Name Description
& AND Sets each bit to 1 if both bits are 1
| OR
Sets each bit to 1 if one of two
bits is 1
^ XOR
Sets each bit to 1 if only one of
two bits is 1
<<
Zero fill left
shift
Shift left by pushing zeros in from
the right and let the leftmost bits
fall off
>>
Signed right
shift
Shift right by pushing copies of
the leftmost bit in from the left,
and let the rightmost bits fall off

16. Membership Operators
Operator Description Example
in
Returns True if a sequence
with the specified value is
present in the object
x in y
not in
Returns True if a sequence
with the specified value is
not present in the object
x not in y

17. Comment
Comments are lines that exist in computer
programs that are ignored by compilers and
interpreters.
Depending on the purpose of your program,
comments can serve as notes to yourself or
reminders, or they can be written with the
intention of other programmers being able to
understand what your code is doing.
Ex- # This is comment
Comment Syntax

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