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Tutorial: Python If-Else Condition Basics

1. Introduction to If-Else Conditions:
- In programming, if-else conditions are used to make decisions based on certain conditions.
- If a condition is true, a specific block of code is executed. Otherwise, an alternative block of code is executed.

2. Syntax of If-Else Statements:
- The basic syntax of an if-else statement in Python is as follows:

if condition:
    # code to be executed if the condition is true
else:
    # code to be executed if the condition is false

3. Simple If-Else Statements:
- Let's start with a simple example to understand the concept:

age = 18

if age >= 18:
    print("You are eligible to vote!")
else:
    print("You are not eligible to vote yet.")

4. Comparison Operators:
- Comparison operators are used to compare values in if-else conditions. Here are some commonly used comparison operators:
- > : Greater than
- < : Less than
- == : Equal to
- != : Not equal to
- >= : Greater than or equal to
- <= : Less than or equal to

5. Logical Operators:
- Logical operators are used to combine multiple conditions in if-else statements. Here are the commonly used logical operators:
- and : Returns True if both conditions are true
- or : Returns True if at least one condition is true
- not : Returns the opposite of the condition

6. Nested If-Else Statements:
- Nested if-else statements allow you to have multiple levels of conditions. Here's an example:

age = 25
income = 50000

if age >= 18:
    if income >= 30000:
        print("You are eligible for a loan!")
    else:
        print("You are not eligible for a loan.")
else:
    print("You must be at least 18 years old to apply for a loan.")

7. Elif (Else If) Statements:
- The elif statement allows you to check multiple conditions in a single if-else block. Here's an example:

score = 85

if score >= 90:
    print("You got an A!")
elif score >= 80:
    print("You got a B!")
elif score >= 70:
    print("You got a C!")
else:
    print("You need to improve your score.")

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This tutorial provides a basic understanding of if-else conditions in Python. Practice writing if-else statements and try solving different problems to strengthen your skills.

after reading the above lecture make sure to answer the following polls

How to get input from the user Python :

1. Getting User Input:
To get input from the user, you can use the input() function in Python. It reads a line of text entered by the user and returns it as a string.

Example:

python
   name = input("Enter your name: ")
   print("Hello, " + name)
   

2. Converting Input to Other Data Types:
By default, input() returns the user input as a string. If you need to convert it to other data types like integer or float, you can use type casting.

Example:

python
   age = int(input("Enter your age: "))
   height = float(input("Enter your height (in meters): "))
   

3. Prompting for Multiple Inputs:
You can prompt for multiple inputs by calling input() multiple times and storing the results in different variables.

Example:

python
   num1 = int(input("Enter first number: "))
   num2 = int(input("Enter second number: "))
   
   sum = num1 + num2
   print("Sum:", sum)
   

  

Let me know if you have any further questions.

Example of the importance of Variable

# Define variables to store length and width
length = 5
width = 3

# Calculate the area using the formula (length * width)
area = length * width

# Print the calculated area
print("The area of the rectangle is:", area)

print(total) is out of the for loop

In Python, a variable is a name that refers to a value. Variables are used to store data that can be used later in the program. In Python, variables are created when they are first assigned a value. The basic syntax for creating a variable in Python is as follows:

variable_name = value


In this syntax, variable_name is the name of the variable, and value is the value that the variable is assigned. Here's an example of creating a variable in Python:

x = 5


In this example, the variable x is created and assigned the value 5. Once a variable is created, it can be used in expressions and statements throughout the program.

Variables in Python can hold many different types of values, including numbers, strings, lists, and more. Here are some examples of creating variables with different types of values:

# create a variable with a number value
x = 5

# create a variable with a string value
name = "Alice"

# create a variable with a list value
fruits = ["apple", "banana", "cherry"]


In these examples, the variables x, name, and fruits are created with different types of values. The variable x is assigned the number 5, the variable name is assigned the string "Alice", and the variable fruits is assigned a list of strings.

Variables in Python can also be reassigned to new values. Here's an example of reassigning a variable in Python:

x = 5
x = x + 1
print(x)


In this example, the variable x is first assigned the value 5. The second line of code reassigns x to the value of x + 1, which is 6. The print() function is then called to print the value of x, which is 6.

The answer for the above question :
Here's detailed explanation

1. Prompting the User:
   You can provide a message or prompt inside the parentheses of the input() function. This message will be displayed to the user, asking them for input. For example:

   name = input("Enter your name: ")

   In this case, "Enter your name: " is the prompt that will be displayed to the user.

2. Storing User Input:
   The value entered by the user is returned by the input() function and can be stored in a variable for further use. In the example above, the user's input will be stored in a variable called name.

3. Handling User Input:
   By default, input() treats all user input as strings. If you want to perform numerical operations on user input, you need to convert it into an appropriate data type (e.g., integer or float). You can use type casting functions like int() or float() for this purpose.

   age = int(input("Enter your age: "))

   Here, we are converting the user's input into an integer using int(). If the user enters something that cannot be converted into an integer (e.g., "abc"), it will raise a ValueError.

4. Using User Input:
   Once you have stored the user's input in a variable, you can use it in your program as needed. For example:
   print("Hello", name)
   print("Next year, you will be", age + 1)

   Here, we are printing a greeting message using the user's name and calculating their age for the next year by adding 1 to the inputted age.
     The answer is:

name = input("Enter your name: ")
age = int(input("Enter your age: "))
print("Hello", name)
   print("Next year, you will be", age + 1)