Hi all,
I read the warning that Python 3 support is higly experimental and that
feedback is welcome.
So here's a thing i came accross :-)
I'm writing a Flask application which used to work fine with python 3.4 and
these packages:
alembic==0.8.2 itsdangerous==0.24
blinker==1.4 Jinja2==2.8
click==5.1 Mako==1.0.2
configobj==5.0.6 Markdown==2.6.2
decorator==4.0.2 MarkupSafe==0.23
dominate==2.1.12 mod-wsgi==4.4.13
Flask==0.10.1 passlib==1.6.5
Flask-Admin==1.3.0 pbr==1.8.0
flask-appconfig==0.11.0 psycopg2==2.6.1
Flask-Bootstrap==3.3.5.6 py-bcrypt==0.4
Flask-Login==0.2.11 python-editor==0.4
Flask-Mail==0.9.1 six==1.9.0
Flask-Migrate==1.6.0 sqlacodegen==1.1.6
Flask-Principal==0.4.0 SQLAlchemy==1.0.8
Flask-Script==2.0.5 sqlalchemy-migrate==0.10.0
Flask-Security==1.7.4 sqlparse==0.1.16
Flask-SQLAlchemy==2.0 Tempita==0.5.2
Flask-WTF==0.12 virtualenv==1.11.6
inflect==0.2.5 Werkzeug==0.10.4
wheel==0.24.0
WTForms==2.0.2
I use a little start-script for developing which looks like this:
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from myapp import app
app.debug = True
print(__name__)
if __name__ == '__main__':
app.run(host='0.0.0.0',debug=True)
Everything works fine.
Now i wanted to use more up-to-date packages (but Python is still version
3.4):
alembic==0.8.3 itsdangerous==0.24
blinker==1.4 Jinja2==2.8
click==5.1 Mako==1.0.3
configobj==5.0.6 Markdown==2.6.4
decorator==4.0.4 MarkupSafe==0.23
dominate==2.1.16 mod-wsgi==4.4.21
Flask==0.10.1 passlib==1.6.5
Flask-Admin==1.3.0 pbr==1.8.1
flask-appconfig==0.11.1 psycopg2==2.6.1
Flask-Bootstrap==3.3.5.7 py-bcrypt==0.4
Flask-Login==0.3.2 python-editor==0.4
Flask-Mail==0.9.1 six==1.10.0
Flask-Migrate==1.6.0 sqlacodegen==1.1.6
Flask-Principal==0.4.0 SQLAlchemy==1.0.9
Flask-Script==2.0.5 sqlalchemy-migrate==0.10.0
Flask-Security==1.7.4 sqlparse==0.1.18
Flask-SQLAlchemy==2.1 Tempita==0.5.2
Flask-WTF==0.12 virtualenv==13.1.2
inflect==0.2.5 visitor==0.1.2
Werkzeug==0.11
wheel==0.24.0
WTForms==2.0.2
When i run my start-script i get:
/home/user/testenv2/lib/python3.4/site-packages/flask_sqlalchemy/__init__.py:800:
UserWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds
significant overhead and will be disabled by default in the future. Set it
to True to suppress this warning.
warnings.warn('SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead
and will be disabled by default in the future. Set it to True to suppress
this warning.')
__main__
* Restarting with stat
/home/user/testenv2/lib/python3.4/site-packages/flask_sqlalchemy/__init__.py:800:
UserWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead
and will be disabled by default in the future. Set it to True to suppress
this warning.
warnings.warn('SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead
and will be disabled by default in the future. Set it to True to suppress
this warning.')
__main__
* Debugger is active!
Traceback (most recent call last):
File "./run.py", line 11, in <module>
app.run(host='0.0.0.0',debug=True)
File "/home/user/testenv2/lib/python3.4/site-packages/flask/app.py", line
772, in run
run_simple(host, port, self, **options)
File
"/home/user/testenv2/lib/python3.4/site-packages/werkzeug/serving.py", line
633, in run_simple
application = DebuggedApplication(application, use_evalex)
File
"/home/user/testenv2/lib/python3.4/site-packages/werkzeug/debug/__init__.py",
line 169, in __init__
if self.pin is None:
File
"/home/user/testenv2/lib/python3.4/site-packages/werkzeug/debug/__init__.py",
line 179, in _get_pin
self._pin, self._pin_cookie = get_pin_and_cookie_name(self.app)
File
"/home/user/testenv2/lib/python3.4/site-packages/werkzeug/debug/__init__.py",
line 96, in get_pin_and_cookie_name
h.update('cookiesalt')
TypeError: Unicode-objects must be encoded before hashing
So I changed the start-script to:
if __name__ == '__main__':
app.run(host="0.0.0.0".encode('utf8'),debug=True)
Now I get this:
/home/user/testenv2/lib/python3.4/site-packages/flask_sqlalchemy/__init__.py:800:
UserWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and
will be disabled by default in the future. Set it to True to suppress this
warning.
warnings.warn('SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead
and will be disabled by default in the future. Set it to True to suppress
this warning.')
__main__
Traceback (most recent call last):
File "./run.py", line 11, in <module>
app.run(host="0.0.0.0".encode('utf8'),debug=True)
File "/home/user/testenv2/lib/python3.4/site-packages/flask/app.py", line
772, in run
run_simple(host, port, self, **options)
File
"/home/user/testenv2/lib/python3.4/site-packages/werkzeug/serving.py", line
661, in run_simple
address_family = select_ip_version(hostname, port)
File
"/home/user/testenv2/lib/python3.4/site-packages/werkzeug/serving.py", line
437, in select_ip_version
if ':' in host and hasattr(socket, 'AF_INET6'):
TypeError: 'str' does not support the buffer interface
By the way: The machine runs both IPv4 and IPv6.
It's not a problem for me to use the previous versions.
But is there something wrong with select_ip_version in Werkzeug 0.11? Or am
I making a mistake?
Greetings, Heiko
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