#1 PyBasics

🐍 Python Concepts with Demo Programs

This blog covers important Python basics with simple code examples. Each demo has syntax highlighting and a copy button — perfect for learning or sharing!

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1️⃣ Base Types and Operations

# Base Types
int_val = 78
float_val = 3.14
bool_val = True
str_val = "Hello Python"

print(f"Integer: {int_val}, Type: {type(int_val)}")
print(f"Float: {float_val}, Type: {type(float_val)}")
print(f"Boolean: {bool_val}, Type: {type(bool_val)}")
print(f"String: {str_val}, Type: {type(str_val)}")

# Conversions
str_to_int = int("15")
int_to_float = float(int_val)

print(f"\nString '15' to Int: {str_to_int}")
print(f"Int {int_val} to Float: {int_to_float}")

# Math Operations
result_add = 5 + 3.6
result_div = 10 / 3
result_floor_div = 10 // 3
result_round = round(5.7)

print(f"\n5 + 3.6 = {result_add}")
print(f"10 / 3 = {result_div}")
print(f"10 // 3 = {result_floor_div}")
print(f"Round(5.7) = {result_round}")

2️⃣ Variable Assignment

a = 10
b = 20
print(f"a: {a}, b: {b}")

c, d = 30, 40
print(f"c: {c}, d: {d}")

e = f = g = 50
print(f"e: {e}, f: {f}, g: {g}")

x, y = 100, 200
print(f"\nBefore swap: x={x}, y={y}")
x, y = y, x
print(f"After swap: x={x}, y={y}")

3️⃣ Sequence Containers

# List
my_list = [10, 20, 30, 40, 50]
print(f"\nOriginal List: {my_list}")

print(f"Second item: {my_list[1]}")
print(f"Slice [1:4]: {my_list[1:4]}")

my_list[1] = 25
print(f"Modified List: {my_list}")

# Tuple
my_tuple = (1, 'two', 3.0)
print(f"\nTuple: {my_tuple}")
print(f"First item: {my_tuple[0]}")

# Dictionary
my_dict = {'name': 'Alice', 'age': 30, 'city': 'NY'}
my_dict['age'] = 31
my_dict['job'] = 'Engineer'
print(f"Updated Dict: {my_dict}")

4️⃣ Boolean Logic & Conditionals

a, b, c = 10, 20, 10
print(a == c)
print((a == c) and (a > b))
print((a == c) or (a > b))

score = 85
if score >= 90:
    print("Grade: A")
elif score >= 80:
    print("Grade: B")
else:
    print("Grade: C or lower")

status = "Active" if score >= 80 else "Inactive"
print(status)

5️⃣ Modules, Math, Random

import math, random

print(f"Cos(0): {math.cos(0):.4f}")
print(f"Pi: {math.pi}")
print(f"Sqrt(25): {math.sqrt(25)}")

print(f"Random int: {random.randint(1,100)}")
print(f"Random float: {random.random():.4f}")

6️⃣ Loops & Iteration

data = ['apple', 'banana', 'cherry']
for item in data:
    print(item)

for i in range(5):
    print(f"Count: {i}")

count = 0
while count < 10:
    count += 1
    if count % 2 == 0:
        continue
    if count == 7:
        print(f"Found {count}!")
        break
    print(f"Odd number: {count}")

7️⃣ Exception Handling

def safe_division(a, b):
    try:
        print(a / b)
    except ZeroDivisionError:
        print("Error: Divide by zero!")
    except TypeError:
        print("Error: Invalid type!")
    finally:
        print("Done.\n")

safe_division(10, 2)
safe_division(10, 0)
safe_division(10, "two")

8️⃣ String Operations

s = "HelloPython"
print(s[1:5])
print(s[-5:])

words = ['data', 'science', 'is', 'fun']
joined = " ".join(words)
print(joined)
print(joined.split(" "))

pi = 3.14159
print(f"Pi = {pi:.2f}")

9️⃣ Boolean & Identity Checks

a = [1,2,3]
b = [1,2,3]
print(a == b)
print(a is b)

c = a
print(a is c)

🔟 Sets & Dictionaries

nums = [1,2,2,3,4,4]
my_set = set(nums)
print(my_set)

user = {'id': 1, 'name': 'Chris', 'admin': True}
for k, v in user.items():
    print(f"{k}: {v}")

11️⃣ Bytes & Bytearray

b = b"Python Data"
print(b)

ba = bytearray(b)
ba[0] = 65
print(ba)
print(ba.decode())

12️⃣ Else Block in Loops

nums = [1,3,5,7]
target = 6

for n in nums:
    if n == target:
        break
else:
    print("Target not found!")

13️⃣ Data Analysis Example

def analyze(scores):
    if not scores:
        print("No scores!")
        return
    mean = sum(scores) / len(scores)
    print(f"Mean: {mean:.2f}")
    for s in scores:
        print("Pass" if s >= 70 else "Fail")

scores = [85, 62, 78, 91, 55, 70, 88]
analyze(scores)

14️⃣ Functions with Defaults

def say_hello(name, greeting="Hello"):
    print(f"{greeting}, {name}!")

say_hello("Alice")
say_hello("Bob", "Good Morning")
say_hello(name="Charlie", greeting="Hey there")

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✅ Final Thoughts

This collection covers all key Python topics — data types, control flow, functions, and error handling. Perfect for students, beginners, and content creators on YouTube.