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Showing content from https://github.com/Python-Markdown/markdown/issues/1040 below:

expected string or bytes-like object · Issue #1040 · Python-Markdown/markdown · GitHub

I'm running into an issue with "simple" Markdown + HTML examples crashing with a TypeError. For example, the following throws a TypeError: expected string or bytes-like object exception:

markdown.markdown(
    'Hello\n<div markdown="1"></div>', 
    extensions=["markdown.extensions.md_in_html"],
)

Versions: Markdown==3.3.1, CPython 3.8.6

I haven't had time yet to investigate this further, but I wanted to get an issue opened with some failing test cases in case others are running into this as well. I suspect this has something to do with the raw HTML parser rewrite in #803.

Save the following as mderror.py:

import traceback
import markdown


def try_render(text):
    print(f"\n\n---- Rendering: {text!r}")
    try:
        html = markdown.markdown(
            text, extensions=["markdown.extensions.md_in_html"],
        )
        print(f"---- PASS: {html!r}")
    except Exception as e:
        print("---- FAILED")
        traceback.print_exc()


try_render('Hello<div markdown="1"></div>')  # Error
try_render('Hello\n<div markdown="1"></div>')  # Error
try_render('Hello\n\n<div markdown="1"></div>')  # Okay

Result:

$ python mderror.py


---- Rendering: 'Hello<div markdown="1"></div>'
<Element 'div' at 0x110758310>
---- FAILED
Traceback (most recent call last):
  File "mderror.py", line 8, in try_render
    html = markdown.markdown(
  File "PROJECT_ROOT/venv/lib/python3.8/site-packages/markdown/core.py", line 386, in markdown
    return md.convert(text)
  File "PROJECT_ROOT/venv/lib/python3.8/site-packages/markdown/core.py", line 290, in convert
    output = pp.run(output)
  File "PROJECT_ROOT/venv/lib/python3.8/site-packages/markdown/postprocessors.py", line 73, in run
    if self.isblocklevel(html):
  File "PROJECT_ROOT/venv/lib/python3.8/site-packages/markdown/postprocessors.py", line 94, in isblocklevel
    m = re.match(r"^\<\/?([^ >]+)", html)
  File "/Users/dbader/.pyenv/versions/3.8.6/lib/python3.8/re.py", line 191, in match
    return _compile(pattern, flags).match(string)
TypeError: expected string or bytes-like object


---- Rendering: 'Hello\n<div markdown="1"></div>'
<Element 'div' at 0x110758900>
---- FAILED
Traceback (most recent call last):
  File "mderror.py", line 8, in try_render
    html = markdown.markdown(
  File "PROJECT_ROOT/venv/lib/python3.8/site-packages/markdown/core.py", line 386, in markdown
    return md.convert(text)
  File "PROJECT_ROOT/venv/lib/python3.8/site-packages/markdown/core.py", line 290, in convert
    output = pp.run(output)
  File "PROJECT_ROOT/venv/lib/python3.8/site-packages/markdown/postprocessors.py", line 73, in run
    if self.isblocklevel(html):
  File "PROJECT_ROOT/venv/lib/python3.8/site-packages/markdown/postprocessors.py", line 94, in isblocklevel
    m = re.match(r"^\<\/?([^ >]+)", html)
  File "/Users/dbader/.pyenv/versions/3.8.6/lib/python3.8/re.py", line 191, in match
    return _compile(pattern, flags).match(string)
TypeError: expected string or bytes-like object


---- Rendering: 'Hello\n\n<div markdown="1"></div>'

---- PASS: '<p>Hello</p>\n<div></div>'

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