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Expected behavior:

    $ kmimetypefinder5 example.py 
    text/x-python3

or

    $ kmimetypefinder5 example.py 
    text/x-python

or

    $ kmimetypefinder5 example.py 
    text/plain

Actual behavior:

    $ kmimetypefinder5 example.py 
    application/xhtml+xml

Summary: Python scripts with a string containing HTML can be
misidentified as HTML files by kmimetypefinder5.

For example, this python script is identified as
"application/xhtml+xml":

#! /usr/bin/env python3
example_string = \
"""\
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";>
  <head>
    <title>Example title</title>
  </head>
  <body>
    <p>Example body</p>
  </body>
</html>
"""
print('Hello, world!')

This difficulty is not shared by other mimetype identification tools.

    $ kmimetypefinder5 example.py 
    application/xhtml+xml
    $ cat example2.py #! /usr/bin/env python3
    print('Hello, world!')
    $ kmimetypefinder5 example2.py 
    text/x-python3
    $ mimetype 'example.py'
    example.py: text/x-python
    $ mimetype 'example2.py'
    example2.py: text/x-python
    $ file --mime-type 'example.py'
    example.py: text/plain
    $ file --mime-type 'example2.py'
    example2.py: text/plain

$ lsb_release -rd
Description:    Ubuntu 18.04.3 LTS
Release:        18.04
$ apt-cache policy kde-cli-tools
kde-cli-tools:
  Installed: 4:5.12.8-0ubuntu0.1
  Candidate: 4:5.12.8-0ubuntu0.1
  Version table:
 *** 4:5.12.8-0ubuntu0.1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 
Packages
        100 /var/lib/dpkg/status
     4:5.12.4-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: kde-cli-tools 4:5.12.8-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
Uname: Linux 4.15.0-72-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Dec 29 13:28:37 2019
InstallationDate: Installed on 2018-12-12 (381 days ago)
InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
SourcePackage: kde-cli-tools
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: kde-cli-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic third-party-packages
-- 
kmimetypefinder5 misidentifies mimetype of python files containing certain 
strings
https://bugs.launchpad.net/bugs/1857824
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which is subscribed to kde-cli-tools in Ubuntu.

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