🐼 Pandas — Data Analysis

pip install pandas

import pandas as pd
import numpy  as np
print(pd.__version__)

# Series — 1D labeled array
s = pd.Series([10, 20, 30], index=['a','b','c'])
print(s['b'])  # 20

# DataFrame — 2D table
data = {
    'Name':   ['Rahul', 'Priya', 'Amit'],
    'Age':    [20, 22, 19],
    'Marks': [85, 92, 78],
    'City':  ['Delhi', 'Mumbai', 'Pune']
}
df = pd.DataFrame(data)
print(df)
print(df.shape)    # (3, 4)
print(df.dtypes)   # column types
print(df.describe()) # statistics

# Column access
print(df['Name'])          # Name column
print(df[['Name','Marks']]) # Multiple columns

# Filter
high = df[df['Marks'] > 80]
print(high)  # Rahul aur Priya

# Sort
sorted_df = df.sort_values('Marks', ascending=False)

# Statistics
print(df['Marks'].mean())  # 85.0
print(df['Marks'].max())   # 92

# New column add
df['Grade'] = df['Marks'].apply(lambda x: 'A' if x>=85 else 'B')

# CSV read/write
df.to_csv('students.csv', index=False)
df2 = pd.read_csv('students.csv')

# Chapter 22: Pandas — Advanced Practice
print("=== Pandas Practice ===")

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

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

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

# Chapter 22: Pandas  Data Analysis — Advanced Examples
# Yeh code copy karo aur run karo!

# Example 1: Basic concept
print("=== Chapter 22: Pandas  Data Analysis ===")

# 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": 22,
    "title":  "Pandas  Data Analysis",
    "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(22))
print(practice_summary(22, 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}}%)")