Errors & debugging
Handle failures gracefully, raise helpful errors, and debug with confidence.
Handle ValueError and ZeroDivisionError in Python with try except
Learn how to catch ValueError and ZeroDivisionError in Python with a practical safe_divide function and demonstrate error handling for invalid conversions.
def safe_divide(numerator, denominator):
try:
result = numerator / denominator
except ValueError as e:
print(f"ValueError caught: {e}")
return None
except ZeroDivisionError:
print("Cannot divide by zero!")
return None
return result
# Test cases
print(safe_divide…How to Configure Python Logging with File Rotation
A complete demo that sets up a logger with a rotating file handler, writes several log entries, and shows the contents of the current log file.
import logging
from logging.handlers import RotatingFileHandler
logger = logging.getLogger("rotating_logger")
logger.setLevel(logging.DEBUG)
file_handler = RotatingFileHandler(
"app.log",
maxBytes=100,
backupCount=3
)
file_handler.setFormatter(
logging.Formatter("%(asctime)s - %(levelname)s - %(messa…How to Handle ValueError and Multiple Exceptions in Python
This code demonstrates try/except blocks for beginners, handling ZeroDivisionError, TypeError, and ValueError with two practical functions: dividing numbers and parsing strings to floats.
def divide_numbers(a, b):
"""Divide two numbers with error handling for beginners."""
try:
result = a / b
print(f"{a} / {b} = {result}")
return result
except ZeroDivisionError:
print(f"Error: Cannot divide {a} by zero!")
except TypeError:
print(f"Error: Both argu…How to Use try except else finally in Python
Demonstrates the correct order of try/except/else/finally blocks in Python with a safe division function.
def safe_divide(numerator, denominator):
try:
result = numerator / denominator
except ZeroDivisionError:
print("Error: Cannot divide by zero!")
except TypeError:
print("Error: Both arguments must be numbers!")
else:
print(f"Division successful: {numerator} / {denominator…Implement circuit breaker open after failures demo in Python
A minimal CircuitBreaker class that calls a function and automatically 'opens' after a set number of consecutive failures, blocking further calls with a RuntimeError.
import time
from datetime import datetime
class CircuitBreaker:
def __init__(self, threshold=3):
self.threshold = threshold
self.failure_count = 0
self.is_open = False
def call(self, func, *args, **kwargs):
if self.is_open:
raise RuntimeError("Circuit is OPEN")
…Split try except ValueError handler for beginners in Python
Demonstrates how to handle ValueError and ZeroDivisionError separately using try/except blocks, with beginner-friendly examples for parsing and division.
def parse_number(text):
try:
number = int(text)
return f"Parsed successfully: {number}"
except ValueError as error:
return f"Conversion failed: {error}"
def divide_numbers(dividend, divisor):
try:
result = dividend / divisor
return f"Division result: {result}"
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Errors & debugging — Python code examples
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