Thanks.
Makes more sense now, and yes, using 2.7 here.
Unfortunately, while could pass the binary values into blob fields well
enough, using forms of parameterised statements, the actual generation of
sql script text files is a step they want to work with at times, if someone
is handling this on site, so had to work first with generating string
values, and then handle executing those statements against a MySQL server
later on using MySQLdb.
Stay well
Jacob Kruger
Blind Biker
Skype: BlindZA
"Roger Wilco wants to welcome you...to the space janitor's closet..."
----- Original Message -----
From: "Peter Otten" <__pete...@web.de>
To: <python-list@python.org>
Sent: Wednesday, January 07, 2015 2:11 PM
Subject: Re: String character encoding when converting data from one
type/format to another
Jacob Kruger wrote:
I'm busy using something like pyodbc to pull data out of MS access .mdb
files, and then generate .sql script files to execute against MySQL
databases using MySQLdb module, but, issue is forms of characters in
string values that don't fit inside the 0-127 range - current one seems
to
be something like \xa3, and if I pass it through ord() function, it comes
out as character number 163.
Now issue is, yes, could just run through the hundreds of thousands of
characters in these resulting strings, and strip out any that are not
within the basic 0-127 range, but, that could result in corrupting data -
think so anyway.
Anyway, issue is, for example, if I try something like
str('\xa3').encode('utf-8') or str('\xa3').encode('ascii'), or
"\xa3" already is a str; str("\xa3") is as redundant as
str(str(str("\xa3"))) ;)
str('\xa3').encode('latin7') - that last one is actually our preferred
encoding for the MySQL database - they all just tell me they can't work
with a character out of range.
encode() goes from unicode to byte; you want to convert bytes to unicode
and
thus need decode().
In this context it is important that you tell us the Python version. In
Python 2 str.encode(encoding) is basically
str.decode("ascii").encode(encoding)
which is why you probably got a UnicodeDecodeError in the traceback:
"\xa3".encode("latin7")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/encodings/iso8859_13.py", line 12, in encode
return codecs.charmap_encode(input,errors,encoding_table)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xa3 in position 0:
ordinal not in range(128)
"\xa3".decode("latin7")
u'\xa3'
print "\xa3".decode("latin7")
£
Aside: always include the traceback in your posts -- and always read it
carefully. The fact that "latin7" is not mentioned might have given you a
hint that the problem was not what you thought it was.
Any thoughts on a sort of generic method/means to handle any/all
characters that might be out of range when having pulled them out of
something like these MS access databases?
Assuming the data in Access is not broken and that you know the encoding
decode() will work.
Another side note is for binary values that might store binary values, I
use something like the following to generate hex-based strings that work
alright when then inserting said same binary values into longblob fields,
but, don't think this would really help for what are really just most
likely badly chosen copy/pasted strings from documents, with strange
encoding, or something:
#sample code line for binary encoding into string output
s_values += "0x" + str(l_data[J][I]).encode("hex").replace("\\", "\\\\")
+
", "
I would expect that you can feed bytestrings directly into blobs, without
any preparatory step. Try it, and if you get failures show us the failing
code and the corresponding traceback.
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