Basics Of python part 1🧠

 

🛠️ Setting Up Python

1. Install Python:

   • Download from: https://www.python.org/downloads/

   • Ensure Add Python to PATH is selected during installation.

2. Check Installation:

   bash
   python --version
   

3. Run Python:

   • Use an IDE (VS Code, PyCharm, etc.)

   • Or run code via terminal/command line:

     bash
     python
     

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🧠 Basic Concepts

1. Hello World

print("Hello, World!")

2. Variables

name = "Alice"
age = 25
pi = 3.14

3. Data Types

• int, float, str, bool, list, tuple, dict, set, None

a = 10          # int
b = 3.14        # float
c = "Python"    # str
d = True        # bool

4. Type Checking

print(type(a))  # <class 'int'>

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🔁 Control Structures

1. If/Else

x = 5
if x > 0:
    print("Positive")
elif x == 0:
    print("Zero")
else:
    print("Negative")

2. Loops

For Loop:

for i in range(5):
    print(i)

While Loop:

count = 0
while count < 5:
    print(count)
    count += 1

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📦 Data Structures

1. Lists

fruits = ["apple", "banana", "cherry"]
fruits.append("orange")
print(fruits[1])  # banana

2. Tuples

point = (10, 20)

3. Dictionaries

person = {"name": "Alice", "age": 25}
print(person["name"])

4. Sets

colors = {"red", "green", "blue"}
colors.add("yellow")

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🧰 Functions

def greet(name):
    return f"Hello, {name}"

print(greet("Bob"))

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📄 File Handling

# Write to file
with open("example.txt", "w") as file:
    file.write("Hello, file!")

# Read from file
with open("example.txt", "r") as file:
    content = file.read()
    print(content)

---

🐞 Error Handling

try:
    x = 10 / 0
except ZeroDivisionError:
    print("Cannot divide by zero!")
finally:
    print("Done")

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🔄 Object-Oriented Programming (OOP)

class Person:
    def __init__(self, name):
        self.name = name

    def greet(self):
        print(f"Hi, I'm {self.name}")

p = Person("Alice")
p.greet()

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🧪 Modules & Libraries

import math

print(math.sqrt(16))

Use third-party packages:

pip install numpy