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Date: Tue, 27 Aug 2013 16:22:32 +0100
From: ishish <ishish@domhain.de>
To: <python-list@python.org>
Subject: Re: [error] [client 178.59.111.223] (2)No such file or directory: exec of
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Xref: csiph.com comp.lang.python:53074

Am 27.08.2013 16:04, schrieb Ferrous Cranus:
> Στις 27/8/2013 4:59 μμ, ο/η ishish έγραψε:
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189] Error 
>>> in
>>> sys.excepthook:
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189]
>>> ValueError: underlying buffer has been detached
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189]
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189] 
>>> Original
>>> exception was:
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189] 
>>> Traceback
>>> (most recent call last):
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189]   File
>>> "/home/nikos/public_html/cgi-bin/metrites.py", line 169, in 
>>> <module>
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189]
>>> cur.execute('''SELECT ID FROM counters WHERE url = %s''', page )
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189]   File
>>>
>>> 
>>> "/usr/local/bin/python/lib/python3.3/site-packages/pymysql/cursors.py",
>>> line 108, in execute
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189]     
>>> query
>>> = query % escaped_args
>>> [Tue Aug 27 13:02:57 2013] [error] [client 110.202.175.189]
>>> TypeError: unsupported operand type(s) for %: 'bytes' and 'str'
>>
>> I quote from a Python 3 Guide
>> [http://python.about.com/od/python30/ss/30_strings_3.htm]:
>>
>> The two data types, str and bytes, are mutually exclusive. One 
>> cannot
>> legally combine them into one call. With the distinction between 
>> text
>> and data, therefore, comes the need to convert between them.
>>
>>
>
> So, in this line:
>
> cur.execute('''SELECT ID FROM counters WHERE url = %s''', page )
>
> the variable 'page' needs conversion to what?
>
> all that is stores is the location of a file
>
> path = '/home/nikos/public_html/'
>
> page = form.getvalue('page')
>
> if not page and os.path.exists( file ):
> # it is an html template
> page = file.replace( path, '' )
>
> So chnage it to what?
> --
> What is now proved was at first only imagined!


The error occurs in file 
"/usr/local/bin/python/lib/python3.3/site-packages/pymysql/cursors.py", 
line 108, in execute
query = query % escaped_args

You can check the actual values and data types using:

print repr(query)
print type(query)

print repr(escaped_args)
print type(escaped_args)

Always useful is a proper exception handling using try:/except: