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Lecture-13 Logical Operators in Python

  • If the condition sequence will change , then output will also change.👇👇 Because we have not set any boundary conditions.

Example :

marathi,hindi,english,math,science= input("Enter Marks of 5 Subject : ").split()
sum=int(marathi)+int(hindi)+int(english)+int(math)+int(science)
per=(sum/500)*100
print("Percentage :",per,"%")
if per>=60:
  print("Grade D")  
elif per>=70:
  print("Grade C")
elif per>=80:
  print("Grade B")
elif per>=90:
  print("Grade A")
else:
  print("FAIl")

⚙️ Output :

Enter Marks of 5 Subject : 90 96 97 94 95 Percentage : 94.399%
Grade D

  • Give Boundary conditions of the above Program

Example :

marathi,hindi,english,math,science= input("Enter Marks of 5 Subject : ").split()
sum=int(marathi)+int(hindi)+int(english)+int(math)+int(science)
per=(sum/500)*100
print("Percentage :",per,"%")
if per>=60 and per<70:
  print("Grade D")
elif per>=70 and per<80:
  print("Grade C")
elif per>=80 and per<90:
  print("Grade B")
elif per>=90: and per<=100:
  print("Grade A")
else:
  print("FAIl")

⚙️ Output:

Enter Marks of 5 Subject : 91 93 93 98 85 Percentage : 92.0 %
Grade A

Logical Operators

Logical operators are used to combine conditional statements.

AND Operator

Result True, if both operand condition are true otherwise false.

Example :

# hsc>60 and jee>120
hsc=50
jee=120
result= hsc>60 and jee>120
print(result)

⚙️ Output :

False

  • 🤔Why is this Output ??

Because , First condition is false and Second Condition is True therefore, result is false.

Example :

# hsc>60 and jee>120
hsc=80
jee=50
result= hsc>60 and jee>120
print(result)

⚙️ Output :

False

  • 🤔Why is this Output ??

Because , First condition is True and Second Condition is False therefore, result is false.

Example :

# hsc>60 and jee>120
hsc=5
jee=30
result= hsc>60 and jee>120
print(result)

⚙️ Output :

False

  • 🤔Why is this Output ??

Because , First condition is False and Second Condition is False therefore, result is false.

Example :

# hsc>60 and jee>120
hsc=80
jee=130
result= hsc>60 and jee>120
print(result)

⚙️ Output :

True

  • 🤔Why is this Output ??

Because , First condition is True and Second Condition is True therefore, result is True.

OR Operator

Result True if both operand condition are true and one of the condition is true otherwise result False.

Example :

# neet>520 or aiims>220
neet=80
aiims=130
result=neet>520 or aiims>220
print(result)

⚙️ Output :

False

  • 🤔Why is this Output ??

Because , First condition is False and Second Condition is False therefore, result is False.

Example :

# neet>520 or aiims>220
neet=530
aiims=130
result=neet>520 or aiims>220
print(result)

⚙️ Output :

True

  • 🤔Why is this Output ??

Because , First condition is True and Second Condition is False therefore, result is True (one of the condition is true).

Example :

# neet>520 or aiims>220
neet=120
aiims=230
result=neet>520 or aiims>220
print(result)

⚙️ Output :

True

  • 🤔Why is this Output ??

Because , First condition is False and Second Condition is True therefore, result is True (one of the condition is true).

Example :

# neet>520 or aiims>220
neet=530
aiims=230
result=neet>520 or aiims>220
print(result)

⚙️ Output :

True

  • 🤔Why is this Output ??

First condition is True and Second Condition is True therefore, result is True (both of the condition is true).

🧠📝Always Remember

In python don't use logical operator symbol like (&&) (||).

In python you can use Logical operator keywords like "and" "or".

🏠 HomeWork

1️⃣ Write a program Check Number is Divisible by 3 and 5 using "and" operator.

👁 Show Answer 

number = int(input(" Please Enter any Positive Integer : "))

if((number % 3 == 0) and (number % 5 == 0)):
    print("Given Number {0} is Divisible by 3 and 5".format(number))
else:
    print("Given Number {0} is Not Divisible by 3 and 5 ".format(number))

2️⃣ Write a program to check person does gym or yoga and if one or both of them are doing ,then give healthy habit otherwise not.

👁 Show Answer 

exercise1=input("Enter your Exercise 1 name :")
exercise2=input("Enter your Exercise 2 name :")
if exercise1=="gym" or exercise1=="yoga" or exercise2=="gym" or exercise2=="yoga":
  print("Healthy life")
else :
  print("Not Healthy life")

🔗 Some Useful Links

📖 References