What-is-IF-ELSE?
The `IF ELSE` structure is fundamental in Python for controlling the flow of your program based on conditions. By understanding this concept, you can create more dynamic and responsive applications.
In Python, `IF ELSE` is a conditional statement that allows you to execute different blocks of code based on whether a condition is true or false. It helps in making decisions in your code.
Basic Structure
The syntax looks like this:
if condition:
# code to execute if condition is true
else:
# code to execute if condition is false
Why is it Useful ?
Using IF ELSE helps us make decisions quickly. Just like in our examples, it tells us what to do based on the situation!
Summary- IF is a question or a condition.
- ELSE is what to do if that condition isn’t true.
Now, you can think of it like a fun game of choices! Want to try creating your own IF ELSE scenario?
Absolutely! Let's dive deeper into the **IF ELSE** concept in Python, focusing on its structure, usage, and practical applications.
Examples on (if-elif-else) conditions in python
Example 1: Traffic Light System
Imagine a traffic light:
- IF the light is green, cars go.
- ELSE if the light is red, cars stop.
light_color = "green"
if light_color == "green":
print ("Cars go!")
else:
print ("Cars stop!")
Example 2: Weather-Based Activity
Suppose you plan your day based on the weather:
- IF it’s sunny, you go for a picnic.
- ELSE if it’s rainy, you stay indoors and read a book.
weather = "rainy"
if weather == "sunny":
print("Let’s go for a picnic!")
else:
print("Let’s stay indoors and read.")
Example 3: Grading System
Consider a grading system based on scores:
- IF the score is 50 or above, you pass.
- ELSE you fail.
score = 45
if score >= 50:
print ("You passed!")
else:
print ("You failed.")
what is elif condition in python...?
Sometimes, you have multiple conditions to check. You can use `elif` (short for "else if") to check additional conditions.
Example 4: Grade Classification
- IF the score is 90 or above, it’s an A.
- ELIF the score is 80 or above, it’s a B.
- ELSE (for all other scores), it’s a C.
score = 85
if score >= 90:
print ("Grade: A")
elif score >= 80:
print ("Grade: B")
else:
print ("Grade: C")
KeyPoints to Remember ?
1. Boolean Conditions: Conditions can be comparisons (like `==`, `!=`, `>`, `<`, etc.) or Boolean expressions.
2. Indentation Matters: Python uses indentation to define blocks of code. Ensure consistent indentation for the code under `if`, `elif`, and `else`.
3. Nested Conditions: You can have `if` statements inside other `if` statements for more complex decision-making.