The maximum length of a Python identifier is not fixed by the language – identifiers can be arbitrarily long in Python (subject only to practical limits like memory or tooling).

What Is the Maximum Length of a Python Identifier?

Quick Scoop

In Python, there is no predefined maximum length for an identifier such as a variable, function, or class name. The language specification does not impose a hard cap like “32 characters” or “79 characters” that you might see in some multiple‑choice questions.

Many quiz sites that give options like 31, 63, or 79 ultimately mark the correct answer as “none of the mentioned” or “not fixed,” explicitly stating that identifiers can be of any length.

But What About “79 Characters”?

You may see 79 characters mentioned a lot in Python discussions, and that can be confusing. The important distinction is:

  • 79 characters is a style guideline, not a language limit.
    PEP 8, Python’s style guide, recommends keeping lines of code to a maximum of 79 characters to maintain readability, and some communities loosely extend that thinking to names.
  • Some blog posts claim “maximum length of an identifier is 79 characters,” but these are either misinterpretations of PEP 8 or oversimplifications for beginners.

Community Q&A threads and MCQ explanations frequently correct this, clarifying that Python identifiers are “unlimited in length,” and 79 characters is merely a readability guideline.

What the Specification and Community Say

Several teaching and Q&A resources explicitly explain that:

  • Python does not define a fixed maximum length for identifiers.
  • The correct choice in MCQs is usually “none of the mentioned” or “not fixed” when given numeric options.
  • Any practical limit comes from:
    • Available memory.
    • Tooling (IDEs, linters, formatters) and how they handle extremely long names.

An example pattern from teaching sites:

“In Python, the length of an identifier is not fixed. While there might be practical limits due to memory constraints, the language specification itself doesn't impose a maximum length. So ‘Not fixed’ is correct.”

Best Practice vs. Theoretical Limit

Even though you can make identifiers extremely long, you generally should not. Good practice:

  • Keep names short but meaningful for readability.
  • Follow PEP 8 style guidance about keeping code readable on typical screens, which often indirectly discourages very long identifiers.

Illustrative example:

  • Legal but bad:

    python

this_is_an_extremely_long_and_unwieldy_variable_name_that_nobody_wants_to_read_every_time = 42

  • Legal and better:

    python

max_retries = 42

Both are valid in Python, but the second is far more maintainable.

If You See This as an Exam Question

If your multiple‑choice options look like:

  • 31 characters
  • 63 characters
  • 79 characters
  • None of the mentioned

Then the correct answer, aligned with Python behavior and mainstream explanations, is:
“None of the mentioned” / “Not fixed”.

TL;DR:
Python does not impose a fixed maximum length on identifiers; they can be arbitrarily long, though style guides and readability concerns strongly encourage keeping them reasonably short.

Information gathered from public forums or data available on the internet and portrayed here.