Hi Dev Community 🙋♀️
This post it's the following of part 1
if you didn't check it you can click on this link down bellow 👇
https://dev.to/sattineez/python-programming-codes-part1-1b0l
- Creating a virtual environment
Note: I personally use and recommend Anaconda for this (it's easier to manage and control the packages) but you can create venv without conda or Pycharm
# Create a virtual environment python -m venv myenv # Activate the virtual environment (on Windows) myenv\Scripts\activate # Activate the virtual environment (on macOS/Linux) source myenv/bin/activate # Install packages within the virtual environment pip install package_name # Deactivate the virtual environment deactivate - Lambda functions
# Define a lambda function add = lambda x, y: x + y result = add(2, 3) print(result) # Use lambda function with built-in functions my_list = [1, 2, 3, 4, 5] new_list = list(map(lambda x: x * 2, my_list)) print(new_list) - Function programming
# Try-except block try: x = 5 / 0 except ZeroDivisionError: print("Cannot divide by zero") # Try-except-else block try: x = 5 / 2 except ZeroDivisionError: print("Cannot divide by zero") else: print("Division successful") # Try-except-finally block try: file = open("myfile.txt", "r") contents = file.read() except: print("Error reading file") finally: file.close() - Working with Generators
# Create a generator function def countdown(n): while n > 0: yield n n -= 1 # Use a generator function for i in countdown(5): print(i) # Create a generator expression my_list = [1, 2, 3, 4, 5] my_generator = (x * 2 for x in my_list) # Use a generator expression for item in my_generator: print(item) - Working with Decorators
# Define a decorator function def my_decorator(func): def wrapper(*args, **kwargs): print("Before function execution") result = func(*args, **kwargs) print("After function execution") return result return wrapper # Use a decorator @my_decorator def greet(name): print(f"Hello, {name}!") greet("John") - Using exceptions
# Try-except block try: x = 5 / 0 except ZeroDivisionError: print("Cannot divide by zero") # Try-except-else block try: x = 5 / 2 except ZeroDivisionError: print("Cannot divide by zero") else: print("Division successful") # Try-except-finally block try: file = open("myfile.txt", "r") contents = file.read() except: print("Error reading file") finally: file.close() - Converting between data types
# Convert a string to an integer my_string = "123" my_int = int(my_string) # Convert a string to a float my_string = "3.14" my_float = float(my_string) # Convert an integer to a string my_int = 123 my_string = str(my_int) # Convert a list to a set my_list = [1, 2, 3, 4, 5] my_set = set(my_list) - Dates and time
# Import the datetime module import datetime # Get the current date and time now = datetime.datetime.now() # Format the date and time formatted = now.strftime("%Y-%m-%d %H:%M:%S") # Create a datetime object my_date = datetime.datetime(2022, 4, 1) # Subtract dates to get a timedelta object delta = now - my_date # Get the total number of seconds in a timedelta object total_seconds = delta.total_seconds() - Calling/Requesting an API
# Import the requests module import requests # Make a GET request to an API response = requests.get("https://api.example.com/data") # Get the status code of the response status_code = response.status_code # Get the content of the response as JSON json_content = response.json() # Make a POST request to an API with data data = {"name": "Sara", "age": 26} response = requests.post("https://api.example.com/data", json=data) - Json module
# Import the JSON module import json # Convert an object to JSON my_dict = {"name": "Sara", "age": 26} json_data = json.dumps(my_dict) # Convert JSON to an object json_data = '{"name": "Sara", "age": 26}' my_dict = json.loads(json_data) - Handling CVS files
import csv # Read data from a CSV file with open('data.csv', 'r') as file: csv_reader = csv.reader(file) for row in csv_reader: print(row) # Write data to a CSV file data = [ ['Name', 'Age', 'City'], ['John', '30', 'New York'], ['Alice', '25', 'London'], ['Bob', '35', 'Paris'] ] with open('data.csv', 'w') as file: csv_writer = csv.writer(file) csv_writer.writerows(data) - SQLite3
import sqlite3 # Connect to a database conn = sqlite3.connect('mydatabase.db') # Create a cursor cursor = conn.cursor() # Execute a SQL query cursor.execute('''CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT, email TEXT)''') # Insert data into the table cursor.execute("INSERT INTO users (name, email) VALUES (?, ?)", ("Sara Carvalho", "sara@example.com")) # Retrieve data from the table cursor.execute("SELECT * FROM users") rows = cursor.fetchall() for row in rows: print(row) # Commit the changes and close the connection conn.commit() conn.close() Stay tuned for Part_3 😊
(if you see some error please leave a comment)
- Sending emails (yep existes a lib for that in python)
import smtplib from email.mime.text import MIMEText # Connect to an SMTP server smtp_server = 'smtp.example.com' smtp_port = 587 smtp_username = 'your_username' smtp_password = 'your_password' server = smtplib.SMTP(smtp_server, smtp_port) server.starttls() server.login(smtp_username, smtp_password) # Compose the email message sender = 'sender@example.com' recipient = 'recipient@example.com' subject = 'Hello from Python!' message = 'This is a test email.' email = MIMEText(message) email['Subject'] = subject email['From'] = sender email['To'] = recipient # Send the email server.sendmail(sender, recipient, email.as_string()) # Close the connection server.quit() 
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