The document discusses various operators and control flow statements in Python. It covers arithmetic, comparison, logical, assignment and membership operators. It also covers if-else conditional statements, while and for loops, and break, continue and pass statements used with loops. The key points are:
- Python supports operators like +, -, *, / etc. for arithmetic and ==, !=, >, < etc. for comparison.
- Control flow statements include if-else for conditional execution, while and for loops for repetition, and break/continue to control loop flow.
- The while loop repeats as long as the condition is true. for loops iterate over sequences like lists, tuples using a loop variable.
An operator is a symbol that tells the computer to perform certain mathematical or logical manipulation on data stored in variables. The variables that are operated are termed as operands.
C operators can be classified into a number of categories. They include:
1. Arithmetic operators
2. Relational operators
3. Logical operators
4. Assignment operator
5. Increment and decrement operators
6. Conditional operator
7. Bitwise operators
8. Special operators
Now, let us discuss each category in detail.
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An operator is a symbol that tells the computer to perform certain mathematical or logical manipulation on data stored in variables. The variables that are operated are termed as operands.
C operators can be classified into a number of categories. They include:
1. Arithmetic operators
2. Relational operators
3. Logical operators
4. Assignment operator
5. Increment and decrement operators
6. Conditional operator
7. Bitwise operators
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Now, let us discuss each category in detail.
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1. PYTHON - BASIC OPERATORS
Python language supports following type of operators.
• Arithmetic Operators
• Comparision Operators
• Logical (or Relational) Operators
• Assignment Operators
• Conditional (or ternary) Operators
2. PYTHON ARITHMETIC
OPERATORS:
Operato
r
Description Example
+ Addition - Adds values on either side of
the operator
a + b will give 30
- Subtraction - Subtracts right hand
operand from left hand operand
a - b will give -10
* Multiplication - Multiplies values on either
side of the operator
a * b will give 200
/ Division - Divides left hand operand by
right hand operand
b / a will give 2
% Modulus - Divides left hand operand by
right hand operand and returns
remainder
b % a will give 0
** Exponent - Performs exponential (power)
calculation on operators
a**b will give 10 to
the power 20
// Floor Division - The division of operands
where the result is the quotient in which
the digits after the decimal point are
removed.
9//2 is equal to 4 and
9.0//2.0 is equal to
4.0
3. PYTHON COMPARISON
OPERATORS:
Operat
or
Description Example
== Checks if the value of two operands are equal or
not, if yes then condition becomes true.
(a == b) is not true.
!= Checks if the value of two operands are equal or
not, if values are not equal then condition becomes
true.
(a != b) is true.
<> Checks if the value of two operands are equal or
not, if values are not equal then condition becomes
true.
(a <> b) is true. This
is similar to !=
operator.
> Checks if the value of left operand is greater than
the value of right operand, if yes then condition
becomes true.
(a > b) is not true.
< Checks if the value of left operand is less than the
value of right operand, if yes then condition
becomes true.
(a < b) is true.
>= Checks if the value of left operand is greater than or
equal to the value of right operand, if yes then
condition becomes true.
(a >= b) is not true.
<= Checks if the value of left operand is less than or
equal to the value of right operand, if yes then
condition becomes true.
(a <= b) is true.
4. PYTHON ASSIGNMENT
OPERATORS:
Operator Description Example
= Simple assignment operator, Assigns values from right
side operands to left side operand
c = a + b will
assigne value of a +
b into c
+= Add AND assignment operator, It adds right operand to
the left operand and assign the result to left operand
c += a is equivalent
to c = c + a
-= Subtract AND assignment operator, It subtracts right
operand from the left operand and assign the result to left
operand
c -= a is equivalent
to c = c - a
*= Multiply AND assignment operator, It multiplies right
operand with the left operand and assign the result to left
operand
c *= a is equivalent
to c = c * a
/= Divide AND assignment operator, It divides left operand
with the right operand and assign the result to left
operand
c /= a is equivalent
to c = c / a
%= Modulus AND assignment operator, It takes modulus
using two operands and assign the result to left operand
c %= a is equivalent
to c = c % a
**= Exponent AND assignment operator, Performs exponential
(power) calculation on operators and assign value to the
left operand
c **= a is
equivalent to c = c
** a
//= Floor Division and assigns a value, Performs floor division
on operators and assign value to the left operand
c //= a is equivalent
to c = c // a
5. PYTHON BITWISE OPERATORS:
Operat
or
Description Example
& Binary AND Operator copies a bit to the
result if it exists in both operands.
(a & b) will give 12
which is 0000 1100
| Binary OR Operator copies a bit if it
exists in either operand.
(a | b) will give 61
which is 0011 1101
^ Binary XOR Operator copies the bit if it is
set in one operand but not both.
(a ^ b) will give 49
which is 0011 0001
~ Binary Ones Complement Operator is
unary and has the effect of 'flipping' bits.
(~a ) will give -60
which is 1100 0011
<< Binary Left Shift Operator. The left
operands value is moved left by the
number of bits specified by the right
operand.
a << 2 will give 240
which is 1111 0000
>> Binary Right Shift Operator. The left
operands value is moved right by the
number of bits specified by the right
operand.
a >> 2 will give 15
which is 0000 1111
6. PYTHON LOGICAL OPERATORS:
Opera
tor
Description Example
and Called Logical AND operator. If both the
operands are true then then condition
becomes true.
(a and b) is true.
or Called Logical OR Operator. If any of the
two operands are non zero then then
condition becomes true.
(a or b) is true.
not Called Logical NOT Operator. Use to
reverses the logical state of its operand. If
a condition is true then Logical NOT
operator will make false.
not(a and b) is false.
7. PYTHON MEMBERSHIP
OPERATORS:
In addition to the operators discussed previously, Python has
membership operators, which test for membership in a sequence,
such as strings, lists, or tuples.
Operator Description Example
in Evaluates to true if it finds a variable in the
specified sequence and false otherwise.
x in y, here in results in a
1 if x is a member of
sequence y.
not in Evaluates to true if it does not finds a
variable in the specified sequence and false
otherwise.
x not in y, here not in
results in a 1 if x is a
member of sequence y.
8. PYTHON OPERATORS
PRECEDENCE
Operator Description
** Exponentiation (raise to the power)
~ + - Ccomplement, unary plus and minus (method names for
the last two are +@ and -@)
* / % // Multiply, divide, modulo and floor division
+ - Addition and subtraction
>> << Right and left bitwise shift
& Bitwise 'AND'
^ | Bitwise exclusive `OR' and regular `OR'
<= < > >= Comparison operators
<> == != Equality operators
= %= /= //= -= +=
*= **=
Assignment operators
is is not Identity operators
in not in Membership operators
not or and Logical operators
9. PYTHON - IF...ELIF...ELSE
STATEMENT
• The syntax of the if statement is:
if expression:
statement(s)
Example:
var1 = 100
if var1:
print "1 - Got a true expression value"
print var1
var2 = 0
if var2:
print "2 - Got a true expression value"
print var2
print "Good bye!"
if expression:
statement(s)
else:
statement(s)
10. var1 = 100
if var1:
print "1 - Got a true expression value"
print var1
else:
print "1 - Got a false expression value"
print var1
var2 = 0
if var2:
print "2 - Got a true expression value"
print var2
else:
print "2 - Got a false expression value"
print var2
print "Good bye!"
11. THE NESTED IF...ELIF...ELSE
CONSTRUCT
Example:
var = 100
if var < 200:
print "Expression value is less than 200"
if var == 150:
print "Which is 150"
elif var == 100:
print "Which is 100"
elif var == 50:
print "Which is 50"
elif var < 50:
print "Expression value is less than 50"
else:
print "Could not find true expression"
print "Good bye!"
12. SINGLE STATEMENT SUITES:
If the suite of an if clause consists only of a single line, it may go on
the same line as the header statement:
if ( expression == 1 ) : print "Value of expression is 1"
13. 5. PYTHON - WHILE LOOP
STATEMENTS
• The while loop is one of the looping constructs available in Python. The while loop continues
until the expression becomes false. The expression has to be a logical expression and must
return either a true or a false value
The syntax of the while loop is:
while expression:
statement(s)
Example:
count = 0
while (count < 9):
print 'The count is:', count
count = count + 1
print "Good bye!"
14. THE INFINITE LOOPS:
• You must use caution when using while loops because of the
possibility that this condition never resolves to a false value. This
results in a loop that never ends. Such a loop is called an infinite
loop.
• An infinite loop might be useful in client/server programming where
the server needs to run continuously so that client programs can
communicate with it as and when required.
Following loop will continue till you enter CTRL+C :
while var == 1 : # This constructs an infinite loop
num = raw_input("Enter a number :")
print "You entered: ", num
print "Good bye!"
15. SINGLE STATEMENT SUITES:
• Similar to the if statement syntax, if your while clause consists
only of a single statement, it may be placed on the same line as
the while header.
• Here is the syntax of a one-line while clause:
while expression : statement
16. 6. PYTHON - FOR LOOP STATEMENTS
• The for loop in Python has the ability to iterate over the items of any sequence,
such as a list or a string.
• The syntax of the loop look is:
for iterating_var in sequence:
statements(s)
Example:
for letter in 'Python': # First Example
print 'Current Letter :', letter
fruits = ['banana', 'apple', 'mango']
for fruit in fruits: # Second Example
print 'Current fruit :', fruit
print "Good bye!"
17. Iterating by Sequence Index:
• An alternative way of iterating through each item is by index offset into the
sequence itself:
• Example:
fruits = ['banana', 'apple', 'mango']
for index in range(len(fruits)):
print 'Current fruit :', fruits[index]
print "Good bye!"
18. 7. PYTHON BREAK,CONTINUE AND PASS
STATEMENTS
The break Statement:
• The break statement in Python terminates the current loop and resumes execution at the
next statement, just like the traditional break found in C.
Example:
for letter in 'Python': # First Example
if letter == 'h':
break
print 'Current Letter :', letter
var = 10 # Second Example
while var > 0:
print 'Current variable value :', var
var = var -1
if var == 5:
break
print "Good bye!"
19. The continue Statement:
• The continue statement in Python returns the control to the beginning of the
while loop. The continue statement rejects all the remaining statements in the
current iteration of the loop and moves the control back to the top of the loop.
Example:
for letter in 'Python': # First Example
if letter == 'h':
continue
print 'Current Letter :', letter
var = 10 # Second Example
while var > 0:
var = var -1
if var == 5:
continue
print 'Current variable value :', var
print "Good bye!"
20. THE ELSE STATEMENT USED WITH LOOPS
Python supports to have an else statement associated with a loop statements.
• If the else statement is used with a for loop, the else statement is executed when the loop
has exhausted iterating the list.
• If the else statement is used with a while loop, the else statement is executed when the
condition becomes false.
Example:
for num in range(10,20): #to iterate between 10 to 20
for i in range(2,num): #to iterate on the factors of the number
if num%i == 0: #to determine the first factor
j=num/i #to calculate the second factor
print '%d equals %d * %d' % (num,i,j)
break #to move to the next number, the #first FOR
else: # else part of the loop
print num, 'is a prime number'
21. THE PASS STATEMENT:
• The pass statement in Python is used when a statement is required
syntactically but you do not want any command or code to execute.
• The pass statement is a null operation; nothing happens when it
executes. The pass is also useful in places where your code will
eventually go, but has not been written yet (e.g., in stubs for
example):
Example:
for letter in 'Python':
if letter == 'h':
pass
print 'This is pass block'
print 'Current Letter :', letter
print "Good bye!"