UnicodeDecodeError: 'utf-8' codec can't decode byte 0x89 in position 0: invalid start byte
Terry Reedy
tjreedy at udel.edu
Thu Dec 6 05:29:04 EST 2012
On 12/6/2012 5:07 AM, iMath wrote:
> the following code originally from http://zetcode.com/databases/mysqlpythontutorial/
> within the "Writing images" part .
>
>
> import MySQLdb as mdb
Not part of stdlib. 'MySQLdb' should be in the subject line to get
attention of someone who is familiar with it. I am not.
> import sys
>
> try:
> fin = open("Chrome_Logo.svg.png",'rb')
> img = fin.read()
> fin.close()
>
> except IOError as e:
>
> print ("Error %d: %s" % (e.args[0],e.args[1]))
> sys.exit(1)
>
>
> try:
> conn = mdb.connect(host='localhost',user='testuser',
> passwd='test623', db='testdb')
> cursor = conn.cursor()
> cursor.execute("INSERT INTO Images SET Data='%s'" % \
> mdb.escape_string(img))
From the name, I would expect that excape_string expects text. From the
error, it seems to specifically expect utf-8 encoded bytes. After
decoding, I expect that it does some sort of 'escaping'. An image does
not qualify as that sort of input. If escape_string takes an encoding
arg, latin1 *might* work.
> conn.commit()
>
> cursor.close()
> conn.close()
>
> except mdb.Error as e:
>
> print ("Error %d: %s" % (e.args[0],e.args[1]))
> sys.exit(1)
>
>
> I port it to python 3 ,and also change
> fin = open("chrome.png")
> to
> fin = open("Chrome_Logo.png",'rb')
> but when I run it ,it gives the following error :
>
> Traceback (most recent call last):
> File "E:\Python\py32\itest4.py", line 20, in <module>
> mdb.escape_string(img))
> UnicodeDecodeError: 'utf-8' codec can't decode byte 0x89 in position 0: invalid start byte
>
> so how to fix it ?
>
--
Terry Jan Reedy
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