📊 Matplotlib — Graphs & Charts

pip install matplotlib

import matplotlib.pyplot as plt
import numpy as np

# Line Plot
x = [1,2,3,4,5]
y = [2,4,6,8,10]

plt.plot(x, y, color='blue', marker='o')
plt.title('Simple Line Plot')
plt.xlabel('X axis')
plt.ylabel('Y axis')
plt.grid(True)
plt.show()

# Bar Chart
subjects = ['Math', 'Science', 'English']
marks    = [85, 92, 78]
plt.bar(subjects, marks, color=['red','green','blue'])
plt.title('Subject Marks')
plt.show()

# Pie Chart
sizes = [30, 25, 20, 25]
labels = ['Python', 'Java', 'C++', 'JS']
plt.pie(sizes, labels=labels, autopct='%1.1f%%')
plt.show()

# Scatter Plot
x = np.random.rand(50)
y = np.random.rand(50)
plt.scatter(x, y, color='green', alpha=0.6)
plt.show()

# Histogram
data = np.random.randn(1000)
plt.hist(data, bins=30, color='purple')
plt.show()

fig, axes = plt.subplots(2, 2, figsize=(10,8))

# 4 plots ek figure mein
axes[0,0].plot([1,2,3], [1,4,9])
axes[0,0].set_title('Line')

axes[0,1].bar(['A','B','C'], [3,7,5])
axes[0,1].set_title('Bar')

plt.tight_layout()
plt.show()

# Chapter 23: Matplotlib — Advanced Practice
print("=== Matplotlib Practice ===")

# Example 1: Basic usage
result = "Python mein Matplotlib bahut powerful hai!"
print(result)

# Example 2: Real world use
data = ["Matplotlib", "Python", "Hindi", "PythonHindi.in"]
for item in data:
    print(f"Item: {item}")

print("\nPractice complete! Great job! 🎉")

# Chapter 23: Matplotlib  Graphs  Charts — Advanced Examples
# Yeh code copy karo aur run karo!

# Example 1: Basic concept
print("=== Chapter 23: Matplotlib  Graphs  Charts ===")

# Example 2: List operations
items = ["Python", "Hindi", "Code", "Practice"]
for i, item in enumerate(items, 1):
    print(f"{i}. {item}")

# Example 3: Dictionary usage
chapter_info = {
    "number": 23,
    "title":  "Matplotlib  Graphs  Charts",
    "level":  "Advanced",
    "done":   False
}
for key, value in chapter_info.items():
    print(f"  {key:10}: {value}")

# Example 4: Function
def practice_summary(chapter, completed=False):
    status = "Complete ✅" if completed else "In Progress ⏳"
    return f"Chapter {chapter}: {status}"

print(practice_summary(23))
print(practice_summary(23, True))

# Step 1: Simple start
print("Python sikhna shuru karo!")

# Step 2: Variables use karo
language = "Python"
version  = 3.12
free     = True
print(f"{{language}} {{version}} — Free: {{free}}")

# Step 3: Loop se repeat karo
topics = ["Variables", "Loops", "Functions", "OOP"]
for topic in topics:
    print(f"  Learning: {{topic}}")

# Step 4: Function banao
def greet_learner(name, chapter):
    return f"Namaste {name}! Chapter {{chapter}} complete karo!"

print(greet_learner("Rahul", 22))

# Step 5: Dictionary se data store karo
progress = {{
    "completed": 22,
    "total":     30,
    "percent":   22/30*100
}}
print(f"Progress: {{progress['completed']}}/{{progress['total']}} ({{progress['percent']:.0f}}%)")