[
    {
        "role": "user",
        "content": "in%20python%20logging%20module%2C%20are%20there%20text%20versions%20of%20the%20logging%20level%20or%20only%20numeric%3F"
    },
    {
        "role": "assistant",
        "content": "Yes \u2014 in Python\u2019s `logging` module, logging levels have both *numeric values* and *textual names*. You can use either, depending on what you\u2019re doing. Below are the details and how they interact.\n\n---\n\n## Standard Levels: Names and Numbers\n\nThe built-in logging levels are:\n\n| Name      | Numeric Value |\n|------------|----------------|\n| `NOTSET`   | 0              |\n| `DEBUG`    | 10             |\n| `INFO`     | 20             |\n| `WARNING`  | 30             |\n| `ERROR`    | 40             |\n| `CRITICAL` | 50             |\n\nThese are constants in the `logging` module. ([docs.python.org](https://docs.python.org/3.9/howto/logging.html?utm_source=openai))\n\n---\n\n## Using Names or Numbers Interchangeably\n\n- When you call functions like `logging.setLevel(...)` or `logging.basicConfig(level=...)`, you can pass **either** the constant (e.g. `logging.INFO`) *or* a string like `\"INFO\"`. The function will accept both. ([docs.python.org](https://docs.python.org/3.10/library/logging.html?highlight=basicconfig&utm_source=openai))  \n- For output, formatters use the name by default. For example, `%(levelname)s` in a `Formatter` shows `\"DEBUG\"`, `\"INFO\"`, etc. ([docs.python.org](https://docs.python.org/3.10/library/logging.html?highlight=basicconfig&utm_source=openai))\n\n---\n\n## Converting Between Names and Numeric Levels\n\nThe `logging` module provides:\n\n- `logging.getLevelName(x)`  \n  - If `x` is a number that matches one of the defined levels, it returns the corresponding name (string).  \n  - If `x` is a string matching a level name, it returns the corresponding numeric value.  \n  - If neither, it returns a fallback like `\"Level 123\"` for unknown numeric values. ([docs.python.org](https://docs.python.org/3.10/library/logging.html?highlight=basicconfig&utm_source=openai))  \n\n- `logging.addLevelName(level, name)`  \n  - Lets you define your own custom level: you give it a numeric value not already in use, plus a name. After that, `getLevelName()` works with your custom level just like with built-ins. ([pythoncentral.io](https://www.pythoncentral.io/how-to-start-logging-in-python/?utm_source=openai))\n\n---\n\n## Why Both Exist\n\nThe reason for having both textual and numeric representations is practical:\n\n- Numeric values allow for comparisons (e.g., to decide what severity to log or filter).\n- Names are easier to read in log messages and configs.\n- Accepting both allows flexible configuration, user input, etc.\n\n---\n\nIf you like, I can show you examples with code (using both text and numbers, plus custom levels). Do you want that?"
    },
    {
        "role": "user",
        "content": "when%20logging%20level%20is%20set%20to%20logging.NOTSET%2C%20is%20anything%20logged%20or%20is%20everything%20logged%3F"
    },
    {
        "role": "assistant",
        "content": "When a logger (in Python\u2019s `logging` module) is set to level `logging.NOTSET`, whether messages are logged depends on whether the logger is the root logger or has a parent with a non-`NOTSET` level. Here\u2019s how it works:\n\n---\n\n## Behavior of `NOTSET`\n\n- `logging.NOTSET` has the numeric value `0`, which is *below* all other levels (DEBUG = 10, INFO = 20, etc.). ([docs.python.org](https://docs.python.org/3.9/library/logging.html?utm_source=openai))  \n- When you call `logger.setLevel(logging.NOTSET)`, it means: \u201cThis logger doesn\u2019t have an explicit threshold; defer to my parent logger\u2019s level for the effective filtering.\u201d ([runebook.dev](https://runebook.dev/en/docs/python/library/logging/logging.NOTSET?utm_source=openai))\n\n---\n\n## Two Cases\n\n1. **The logger is not the root logger:**\n\n   If a non-root logger has level `NOTSET`, it inherits the level from its parent. If the parent also has `NOTSET`, the search continues up the chain until a logger with a level other than `NOTSET` is found (or you reach the root). That found level becomes the *effective level*. ([docs.python.org](https://docs.python.org/3/library/logging.html?highlight=basicconfig&utm_source=openai))\n\n2. **The logger is the root logger:**\n\n   The root logger starts with a default level of `WARNING` (30), *unless explicitly changed*. If the root logger\u2019s level is still `WARNING`, then debug and info messages are suppressed. If you set the root logger itself to `NOTSET` (or inherit to it), then nothing blocks ANY level \u2014 *every message* is passed along to handlers. ([runebook.dev](https://runebook.dev/en/docs/python/library/logging/logging.NOTSET?utm_source=openai))\n\n---\n\n## Key Takeaways\n\n- Setting a **non-root** logger to `NOTSET` doesn\u2019t mean \"log everything\" \u2014 it means \u201cuse the level set somewhere higher in the hierarchy.\u201d  \n- Only when the root logger ends up with `NOTSET` will you get *all* messages, regardless of level.  \n- Handlers also have their own levels. Even if a logger\u2019s effective level allows a message through, a handler can still filter it out if its own level is higher. ([docs.python.org](https://docs.python.org/3.9/library/logging.html?utm_source=openai))\n\n---\n\nIf you like, I can walk through a few code examples showing different logger/handler configurations to illustrate this."
    }
]