Reference library

Errors & debugging

Handle failures gracefully, raise helpful errors, and debug with confidence.

4 matches

How to Build a Simple Debug Timer in Python

Create a context manager class to time the execution of a code block with a one-line printout.

import time


class DebugTimer:
    """Context manager that times the execution of a code block."""

    def __init__(self, label="Operation"):
        self.label = label
        self.start_time = None

    def __enter__(self):
        self.start_time = time.perf_counter()
        return self

    def __exit__(self, e…

15 0 Open

Errors & debugging easy

How to Build an Error Code Enum in Python

Define an API error code enum with descriptions and build structured error payloads for HTTP responses.

enum error-handling api

Python

from enum import Enum

class APIErrorCode(Enum):
    SUCCESS = 0
    BAD_REQUEST = 400
    UNAUTHORIZED = 401
    FORBIDDEN = 403
    NOT_FOUND = 404
    CONFLICT = 409
    INTERNAL_ERROR = 500


def describe_error(code):
    descriptions = {
        APIErrorCode.SUCCESS: "Request completed successfully",
        APIE…

11 0 Open

Errors & debugging easy

How to Dump a Debugging Repr for Unknown Types in Python

Build a fallback repr that shows dataclass fields or object attributes for any value, handy when debugging unknown types.

debugging repr dataclasses

Python

import dataclasses
from typing import Any


@dataclasses.dataclass
class Sample:
    name: str
    values: list[int]


def dump_repr(obj: Any) -> str:
    """Return a concise but complete repr for debugging unknown types."""
    if dataclasses.is_dataclass(obj):
        fields = ", ".join(
            f"{field.name}={…

12 0 Open

Errors & debugging easy

How to Handle ValueError with try-except in Python

Build a beginner-friendly division calculator that catches ValueError and ZeroDivisionError with try-except blocks.

error-handling try-except valueerror

Python

def get_number(prompt="Enter a number: "):
    while True:
        try:
            value = float(input(prompt))
            return value
        except ValueError:
            print("That's not a valid number. Please try again.")


def divide_numbers(a, b):
    try:
        result = a / b
        return result
    ex…

12 0 Open

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