Tutorial

Learn how to build a simple blog application using Python and Flask. Setup from flask import Flask, render_template, request, redirect, url_for app = Flask(__name__) # Simple in-memory storage posts = [] Routes @app.route('/') def index(): return render_template('index.html', posts=posts) @app.route('/post', methods=['GET', 'POST']) def create_post(): if request.method == 'POST': title = request.form['title'] content = request.form['content'] posts.append({'title': title, 'content': content}) return redirect(url_for('index')) return render_template('create_post.html') Templates <!-- index.html --> {% for post in posts %} <article> <h2>{{ post.title }}</h2> <p>{{ post.content }}</p> </article> {% endfor %} Running flask run Conclusion Build your first Flask blog application! 🚀

Pandas provides powerful tools for joining DataFrames. Here’s a comprehensive guide. Merge Types Inner Join import pandas as pd df1 = pd.DataFrame({'key': ['A', 'B'], 'value1': [1, 2]}) df2 = pd.DataFrame({'key': ['B', 'C'], 'value2': [3, 4]}) result = pd.merge(df1, df2, on='key', how='inner') Left Join result = pd.merge(df1, df2, on='key', how='left') Right Join result = pd.merge(df1, df2, on='key', how='right') Outer Join result = pd.merge(df1, df2, on='key', how='outer') Multiple Keys result = pd.merge(df1, df2, on=['key1', 'key2']) Best Practices Choose the right join type Handle missing values Use appropriate keys Check for duplicates Optimize for large datasets Conclusion Master Pandas joins for efficient data manipulation! 📊

Migrating from Python 2 to Python 3 requires careful planning. Here’s a step-by-step guide. Key Differences Print Statement # Python 2 print "Hello" # Python 3 print("Hello") Division # Python 2 5 / 2 # 2 # Python 3 5 / 2 # 2.5 5 // 2 # 2 Unicode # Python 2 s = u"Hello" # Python 3 s = "Hello" # Unicode by default Migration Tools # 2to3 tool 2to3 -w script.py # Modernize python-modernize script.py Best Practices Test thoroughly Update dependencies Use type hints Handle bytes/strings Update string formatting Conclusion Migrate to Python 3 for modern Python development! 🐍