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Update for deprecated HTMLParser.unescape for python >=3.9
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considering backward compatibility
Python 3.9.0 changelog:
https://docs.python.org/release/3.9.0/whatsnew/changelog.html
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@ugur1yildiz
ugur1yildiz committed Oct 26, 2020
1 parent e9a5e9c commit 5490a99
Showing 1 changed file with 8 additions and 2 deletions.
10 changes: 8 additions & 2 deletions edx_dl/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,13 @@

# This module contains generic functions, ideally useful to any other module
from six.moves.urllib.request import urlopen, Request
from six.moves import html_parser

import sys
if sys.version_info[0] >= 3:
import html
else:
from six.moves import html_parser
html = html_parser.HTMLParser()

import errno
import json
Expand Down Expand Up @@ -119,7 +125,7 @@ def clean_filename(s, minimal_change=False):
"""

# First, deal with URL encoded strings
h = html_parser.HTMLParser()
h = html
s = h.unescape(s)

# strip paren portions which contain trailing time length (...)
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15 comments on commit 5490a99

@1c7
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@1c7 1c7 commented on 5490a99 Dec 21, 2020

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come from coursera-dl/coursera-dl#778
this works perfectly!

@Saksham2k1
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how to use it. i am using coursera-dl

@1c7
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@1c7 1c7 commented on 5490a99 Jan 5, 2021

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edit edx_dl/utils.py file, just like this commit did. copy & paste these code to correct position @Saksham2k1

@yoshieki1992
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it works. Thank you

@bqiu86
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@bqiu86 bqiu86 commented on 5490a99 Jun 12, 2021

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worked for me! thanks!

@VenkatsQuest
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Great Fix , thanks it worked for me too.

@CaptainJamesMaximus
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@CaptainJamesMaximus CaptainJamesMaximus commented on 5490a99 Aug 11, 2021 •
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edit edx_dl/utils.py file, just like this commit did. copy & paste these code to correct position @Saksham2k1

How do I locate this file in the system files?

@joejony
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@joejony joejony commented on 5490a99 Sep 8, 2021 •
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did those changes and still didn't fix it (windows).

In the suggested function
if sys.version_info[0] >= 3: import html else: from six.moves import html_parser html = html_parser.HTMLParser()

I get: "Code is unreachable Pylance"

Here is how my utils.py file is:

`# -- coding: utf-8 --
"""
This module provides utility functions that are used within the script.
"""

import six
import sys
if sys.version_info[0] >= 3:
import html
else:
from six import html_parser
html = html_parser.HTMLParser()
import os
import re
import time
import json
import errno
import random
import string
import logging
import datetime
from bs4 import BeautifulSoup as BeautifulSoup_
from xml.sax.saxutils import escape, unescape
from six import iteritems

if six.PY3: # pragma: no cover
from urllib.parse import urlparse, urljoin
else:
from urlparse import urlparse, urljoin

Python3 (and six) don't provide string

if six.PY3:
from string import ascii_letters as string_ascii_letters
from string import digits as string_digits
else:
from string import letters as string_ascii_letters
from string import digits as string_digits

from .define import COURSERA_URL, WINDOWS_UNC_PREFIX

Force us of bs4 with html.parser

def BeautifulSoup(page): return BeautifulSoup_(page, 'html.parser')

if six.PY2:
def decode_input(x):
stdin_encoding = sys.stdin.encoding
if stdin_encoding is None:
stdin_encoding = "UTF-8"
return x.decode(stdin_encoding)
else:
def decode_input(x):
return x

def spit_json(obj, filename):
with open(filename, 'w') as file_object:
json.dump(obj, file_object, indent=4)

def slurp_json(filename):
with open(filename) as file_object:
return json.load(file_object)

def is_debug_run():
"""
Check whether we're running with DEBUG loglevel.

@return: True if running with DEBUG loglevel.
@rtype: bool
"""
return logging.getLogger().isEnabledFor(logging.DEBUG)

def random_string(length):
"""
Return a pseudo-random string of specified length.
"""
valid_chars = string_ascii_letters + string_digits

return ''.join(random.choice(valid_chars) for i in range(length))

Taken from: https://wiki.python.org/moin/EscapingHtml

escape() and unescape() takes care of &, < and >.

HTML_ESCAPE_TABLE = {
'"': """,
"'": "'"
}

HTML_UNESCAPE_TABLE = dict((v, k) for k, v in HTML_ESCAPE_TABLE.items())

def unescape_html(s):
h = html_parser.HTMLParser()
s = h.unescape(s)
s = unquote_plus(s)
return unescape(s, HTML_UNESCAPE_TABLE)

def clean_filename(s, minimal_change=False):
"""
Sanitize a string to be used as a filename.

If minimal_change is set to true, then we only strip the bare minimum of
characters that are problematic for filesystems (namely, ':', '/' and
'\x00', '\n').
"""

# First, deal with URL encoded strings
h = html
s = h.unescape(s)
s = unquote_plus(s)

# Strip forbidden characters
# https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
s = (
    s.replace(':', '-')
    .replace('/', '-')
    .replace('<', '-')
    .replace('>', '-')
    .replace('"', '-')
    .replace('\\', '-')
    .replace('|', '-')
    .replace('?', '-')
    .replace('*', '-')
    .replace('\x00', '-')
    .replace('\n', ' ')
)

# Remove trailing dots and spaces; forbidden on Windows
s = s.rstrip(' .')

if minimal_change:
    return s

s = s.replace('(', '').replace(')', '')
s = s.rstrip('.')  # Remove excess of trailing dots

s = s.strip().replace(' ', '_')
valid_chars = '-_.()%s%s' % (string.ascii_letters, string.digits)
return ''.join(c for c in s if c in valid_chars)

def normalize_path(path):
"""
Normalizes path on Windows OS. This means prepending
? to the path to get access to
Win32 device namespace instead of Win32 file namespace.
See https://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx#maxpath

@param path: Path to normalize.
@type path: str

@return: Normalized path.
@rtype str
"""
if sys.platform != 'win32':
    return path

if path.startswith(WINDOWS_UNC_PREFIX):
    return path

return WINDOWS_UNC_PREFIX + os.path.abspath(path)

def get_anchor_format(a):
"""
Extract the resource file-type format from the anchor.
"""

# (. or format=) then (file_extension) then (? or $)
# e.g. "...format=txt" or "...download.mp4?..."
fmt = re.search(r"(?:\.|format=)(\w+)(?:\?.*)?$", a)
return fmt.group(1) if fmt else None

def mkdir_p(path, mode=0o777):
"""
Create subdirectory hierarchy given in the paths argument.
"""

try:
    os.makedirs(path, mode)
except OSError as exc:
    if exc.errno == errno.EEXIST and os.path.isdir(path):
        pass
    else:
        raise

def clean_url(url):
"""
Remove params, query and fragment parts from URL so that os.path.basename
and os.path.splitext can work correctly.

@param url: URL to clean.
@type url: str

@return: Cleaned URL.
@rtype: str
"""
parsed = urlparse(url.strip())
reconstructed = ParseResult(
    parsed.scheme, parsed.netloc, parsed.path,
    params='', query='', fragment='')
return reconstructed.geturl()

def fix_url(url):
"""
Strip whitespace characters from the beginning and the end of the url
and add a default scheme.
"""
if url is None:
return None

url = url.strip()

if url and not urlparse(url).scheme:
    url = "http://" + url

return url

def is_course_complete(last_update):
"""
Determine is the course is likely to have been terminated or not.

We return True if the timestamp given by last_update is 30 days or older
than today's date.  Otherwise, we return True.

The intended use case for this is to detect if a given courses has not
seen any update in the last 30 days or more.  Otherwise, we return True,
since it is probably too soon to declare the course complete.
"""
rv = False
if last_update >= 0:
    delta = time.time() - last_update
    max_delta = total_seconds(datetime.timedelta(days=30))
    if delta > max_delta:
        rv = True
return rv

def total_seconds(td):
"""
Compute total seconds for a timedelta.

Added for backward compatibility, pre 2.7.
"""
return (td.microseconds +
        (td.seconds + td.days * 24 * 3600) * 10 ** 6) // 10 ** 6

def make_coursera_absolute_url(url):
"""
If given url is relative adds coursera netloc,
otherwise returns it without any changes.
"""

if not bool(urlparse(url).netloc):
    return urljoin(COURSERA_URL, url)

return url

def extend_supplement_links(destination, source):
"""
Extends (merges) destination dictionary with supplement_links
from source dictionary. Values are expected to be lists, or any
data structure that has extend method.

@param destination: Destination dictionary that will be extended.
@type destination: @see CourseraOnDemand._extract_links_from_text

@param source: Source dictionary that will be used to extend
    destination dictionary.
@type source: @see CourseraOnDemand._extract_links_from_text
"""
for key, value in iteritems(source):
    if key not in destination:
        destination[key] = value
    else:
        destination[key].extend(value)

def print_ssl_error_message(exception):
"""
Print SSLError message with URL to instructions on how to fix it.
"""
message = """
#####################################################################

ATTENTION! PLEASE READ THIS!

The following error has just occurred:

%s %s

Please read instructions on how to fix this error here:

https://github.com/coursera-dl/coursera-dl#sslerror-errno-1-_sslc504-error14094410ssl-routinesssl3_read_bytessslv3-alert-handshake-failure

#####################################################################
""" % (type(exception).name, str(exception))
logging.error(message)`

@aliarabbasi5155
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edit edx_dl/utils.py file, just like this commit did. copy & paste these code to correct position @Saksham2k1

Thanks, Worked for me...

@leonardo73-max
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Can you please give instructions on how to paste it? I can't wrap my head around it, I got notepad++ of course but Idk where to paste

@shwhsx
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@shwhsx shwhsx commented on 5490a99 May 14, 2022 •
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I updated the util.py file and still get the same error: "File "/XXX/env/lib/python3.9/site-packages/coursera/utils.py", line 118, in clean_filename
s = h.unescape(s)
AttributeError: 'HTMLParser' object has no attribute 'unescape'"

The line s = h.unescape(s) is not on 118 and I already set h = html before that line. Any suggestions? Thanks!

//I figured it out. I revised the util file from previous download. After I fixed the correct file, it worked.

@junaid1990
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problem not resolved

@jonathann19
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thanks a lot, it worked for me!

@imchamodi
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Thanks a lot, it worked for me too!

@amch-med23
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Thanks, this works fine, i had the same error while trying to install flasgger package on python3.10, i edited /usr/local/lib/python3.10/dist-packages/setuptool/py33compat.py , and i applied the fix and everything works now. I guess the error is caused by html_parser.HTMLParser() which doesn't exist in sys.version_info < 3.

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