Here is model column: title = Column(Unicode(100)) When I try to add a record

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Asked: May 28, 20262026-05-28T04:35:29+00:00 2026-05-28T04:35:29+00:00

Here is model column: title = Column(Unicode(100)) When I try to add a record

0

Here is model column:

title = Column(Unicode(100))

When I try to add a record to db with cyrillic letters in title I get an error:

UnicodeEncodeError:
latin-1′ codec can’t encode characters on position …

If i encode it with utf-8

title = request.POST['title'].encode('utf-8')

I get next error:

ProgrammingError: You must not use 8-bit bytestrings unless you use a text_factory that can interpret 8-bit btystrings (like text_factory = str). It is highly recommended that you instead just switch your application to Unicode strings.

When I decode utf-8

title = request.POST['title'].decode('utf-8')

There is new error

UnicodeDecodeError: ‘ascii’ codec can’t encode characters…

What to do?

EDIT:

I’m using Sqlite3, I thought it may be important.

EDIT 2: (code and traceback)

My code:

title = request.POST['title']

new_model = Model(
    ...
    title = title,
    ...
)
DBSession.add(new_model)
DBSession.flush()

And Traceback (most recent call last):

File “/home/p/work/SUN/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/panels/performance.py”, line 55, in resource_timer_handler

result = handler(request)

File “/home/p/work/SUN/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/tweens.py”, line 20, in excview_tween

response = handler(request)

File “/home/p/work/SUN/lib/python2.6/site-packages/pyramid_tm-0.3-py2.6.egg/pyramid_tm/init.py”, line 61, in tm_tween

response = handler(request)

File “/home/p/work/SUN/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/router.py”, line 164, in handle_request

response = view_callable(context, request)

File “/home/p/work/SUN/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/config/views.py”, line 316, in rendered_view

result = view(context, request)

File “/home/p/work/SUN/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/config/views.py”, line 426, in _requestonly_view

response = view(request)

File “/home/p/work/SUN/sunviver/sunviver/views/advert.py”, line 187, in create

return HTTPFound(location=new_advert.url())

File “/home/p/work/SUN/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/httpexceptions.py”, line 444, in init

body_template=body_template, location=location, **kw)

File “/home/p/work/SUN/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/httpexceptions.py”, line 213, in init

Response.init(self, status=status, **kw)

File “build/bdist.linux-i686/egg/webob/response.py”, line 141, in init

setattr(self, name, value)

File “build/bdist.linux-i686/egg/webob/descriptors.py”, line 112, in fset

value = value.encode(‘latin-1’)

And new_advert.url():

def url(self):
    return '/%s/%s' % (self.id, self.title.replace(' ', '_'))

@J.F. Sebastian

Traceback (most recent call last):
File “/usr/lib/python2.6/wsgiref/handlers.py”, line 93, in run

self.result = application(self.environ, self.start_response)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/router.py”, line 187, in call

response = self.handle_request(request)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/toolbar.py”, line 157, in toolbar_tween

toolbar.process_response(response)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/toolbar.py”, line 55, in process_response

vars, request=request)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/renderers.py”, line 81, in render

return helper.render(value, None, request=request)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/renderers.py”, line 420, in render

result = renderer(value, system_values)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/mako_templating.py”, line 162, in call

reraise(MakoRenderingException(errtext), None, exc_info[2])

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/mako_templating.py”, line 154, in call

result = template.render_unicode(**system)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/template.py”, line 311, in render_unicode

as_unicode=True)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 660, in _render

**_kwargs_for_callable(callable_, data))

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 692, in _render_context

_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 718, in _exec_template

callable_(context, *args, **kwargs)

File “pyramid_debugtoolbar_templates_toolbar_mako”, line 117, in render_body

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/panels/headers.py”, line 54, in content

vars, self.request)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/panels/init.py”, line 24, in render

return render(template_name, vars, request=request)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/renderers.py”, line 81, in render

return helper.render(value, None, request=request)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/renderers.py”, line 420, in render

result = renderer(value, system_values)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/mako_templating.py”, line 162, in call

reraise(MakoRenderingException(errtext), None, exc_info[2])

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/mako_templating.py”, line 154, in call

result = template.render_unicode(**system)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/template.py”, line 311, in render_unicode

as_unicode=True)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 660, in _render

**_kwargs_for_callable(callable_, data))

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 692, in _render_context

_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 718, in _exec_template

callable_(context, *args, **kwargs)

File “pyramid_debugtoolbar_panels_templates_headers_mako”, line 34, in render_body

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/MarkupSafe-0.15-py2.6.egg/markupsafe/_native.py”, line 21, in escape

return Markup(unicode(s)

MakoRenderingException:

Traceback (most recent call last):

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/mako_templating.py”, line 154, in call

result = template.render_unicode(**system)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/template.py”, line 311, in render_unicode

as_unicode=True)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 660, in _render

**_kwargs_for_callable(callable_, data))

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 692, in _render_context

_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 718, in _exec_template

callable_(context, *args, **kwargs)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/templates/toolbar.mako”, line 61, in render_body

${panel.content()|n}

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/panels/headers.py”, line 54, in content

vars, self.request)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/panels/init.py”, line 24, in render

return render(template_name, vars, request=request)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/renderers.py”, line 81, in render

return helper.render(value, None, request=request)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/renderers.py”, line 420, in render

result = renderer(value, system_values)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/mako_templating.py”, line 162, in call

reraise(MakoRenderingException(errtext), None, exc_info[2])

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/mako_templating.py”, line 154, in call

result = template.render_unicode(**system)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/template.py”, line 311, in render_unicode

as_unicode=True)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 660, in _render

**_kwargs_for_callable(callable_, data))

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 692, in _render_context

_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 718, in _exec_template

callable_(context, *args, **kwargs)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/panels/templates/headers.mako”, line 13, in render_body

${value|h}

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/MarkupSafe-0.15-py2.6.egg/markupsafe/_native.py”, line 21, in escape

return Markup(unicode(s)

MakoRenderingException:

Traceback (most recent call last):

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid-1.3a3-py2.6.egg/pyramid/mako_templating.py”, line 154, in call

result = template.render_unicode(**system)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/template.py”, line 311, in render_unicode

as_unicode=True)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 660, in _render

**_kwargs_for_callable(callable_, data))

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 692, in _render_context

_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/Mako-0.5.0-py2.6.egg/mako/runtime.py”, line 718, in _exec_template

callable_(context, *args, **kwargs)

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/pyramid_debugtoolbar-0.9.7-py2.6.egg/pyramid_debugtoolbar/panels/templates/headers.mako”, line 13, in render_body

${value|h}

File “/home/ponomar/v/ENV/lib/python2.6/site-packages/MarkupSafe-0.15-py2.6.egg/markupsafe/_native.py”, line 21, in escape

return Markup(unicode(s)

UnicodeDecodeError: ‘ascii’ codec can’t decode byte 0xd0 in position 7: ordinal not in range(128)

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1 Answer

Editorial Team · Answer 1 · 2026-05-28T04:35:29+00:00

Editorial Team

2026-05-28T04:35:29+00:00Added an answer on May 28, 2026 at 4:35 am

Encoding converts Unicode strings to byte strings. You need to go in the other direction,
decoding: request.POST['title'].decode('utf-8') (assuming request.POST['title'] is a UTF8-encoded str).

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