Interesting Problem

Gary Herron gherron at islandtraining.com
Wed Jan 20 17:37:55 CET 2010


Victor Subervi wrote:
> Hi;
> I think I finally have an interesting problem for y'all. I need to 
> import a script from a lower dir, forcing me to change dirs:

Wait a moment...  Your assumption that you need to change directories is 
invalid.  (And that means everything you do below this point unnecessary.)

Python provides many ways to easily import from arbitrary directories:

 * Before run time, modify the environment variable
    PYTHONPATH with the desired directory. 
    Then import as normal.

 * At run time, import sys and append the desired
    path to sys.path, and again import as normal.

 * Check out the "imp" module which allows you to
    import from files specified via a path.

Straighten that out, then we can examine the following (suspicious) clams:
 * that you must evaluate *before* some import
 * that you must use globals
 * python's problem with globals

Gary Herron




>
> cwd = os.getcwd()
> os.chdir('%s/..' % cwd)
> sys.path.append(os.getcwd())
> from templateFrame import top, bottom
> os.chdir(cwd)
>
> Because I've found I must do my form evaluations *before* changing dir 
> as above, I am forced to call these values as globals:
>
> form = cgi.FieldStorage()
> store = form.getfirst('store')
> cat = form.getfirst('cat')
> id = form.getfirst('id')
> pkg = form.getfirst('pkg')
> patientID = form.getfirst('patientID')
>
> Now, apparently because of python's problem with globals, when I call 
> "id" as follows:
>
> cursor.execute('select ProductID from productsPackages where 
> PackageID=%s' % id)
>
> I get the following error:
>
> /var/www/html/angrynates.com/cart/Store_frame2.py 
> <http://angrynates.com/cart/Store_frame2.py>
>   135   cursor.close()
>   136   bottom()
>   137
>   138 Store_frame2()
>   139
> Store_frame2 = <function Store_frame2>
>  /var/www/html/angrynates.com/cart/Store_frame2.py 
> <http://angrynates.com/cart/Store_frame2.py> in Store_frame2()
>   119     printAProduct()
>   120   else:
>   121     cursor.execute('select ProductID from productsPackages where 
> PackageID=%s' % id)
>   122     for id in [itm[0] for itm in cursor]:
>   123       printAProduct(id)
> global cursor = <MySQLdb.cursors.Cursor object>, cursor.execute = 
> <bound method Cursor.execute of <MySQLdb.cursors.Cursor object>>, 
> global id = '1'
>
> UnboundLocalError: local variable 'id' referenced before assignment
>       args = ("local variable 'id' referenced before assignment",)
>
> Full code below. Please advise.
> TIA,
> beno
>
> #! /usr/bin/python
>
> import string
> import cgitb; cgitb.enable()
> import cgi
> import MySQLdb
> import sys,os
> from sets import Set
> import fpformat
> cwd = os.getcwd()
> sys.path.append(cwd)
> from login import login
> from particulars import truncate
>
> form = cgi.FieldStorage()
> store = form.getfirst('store')
> cat = form.getfirst('cat')
> id = form.getfirst('id')
> pkg = form.getfirst('pkg')
> patientID = form.getfirst('patientID')
>
> try:
>   browser = form.getfirst('browser', 'all')
> except:
>   browser = headers()
>
> os.chdir('%s/..' % cwd)
> sys.path.append(os.getcwd())
> from templateFrame import top, bottom
> os.chdir(cwd)
>
> ourFile = string.split(__file__, "/")
> p = ourFile[len(ourFile) - 1]
> p = p[: - 9]
> site = ourFile[4][:-10]
> if site != '':
>   site = site[:-1]
>
> user, passwd, db, host = login()
> db = MySQLdb.connect(host, user, passwd, db)
> cursor= db.cursor()
>
> cursor.execute('describe %s;' % store)
> descr = cursor.fetchall()
> cols = []
> for elt in descr:
>   cols.append(elt[0])
>
> def printAProduct(id=id):
>   lastID = ''
>   cursor.execute('select * from %s where ID="%s"' % (store, id))
>   vals = cursor.fetchone()
>   prodDict = dict(zip(cols, vals))
>   for col, item in prodDict.iteritems():
>     if col == 'ID':
>       print '<input type="hidden" name="prodid" value="%s" />' % item
>     try: # Stores such as products (but not prescriptions) will pass 
> through
>       from particulars import ourOptions
>       if col in ourOptions():
>         print '<input type="hidden" name="%s" value="%s" />' % (col, item)
>     except:
>       pass
>     if col[:3] != 'pic':
>       notSet = 1
>       if isinstance(item, (str, int, long, float, long, complex, 
> unicode, list, buffer, xrange, tuple)):
>         print '<b>%s: </b>%s<br />\n' % (col, item)
>       else:
>         try:
>           html = "<b>%s</b>: <select name='%s'>" % (col, col)
>           notSet = 0
>           for itm in item:
>             try:
>               color, number = itm.split('_')
>               html += "<option value='%s'>%s</option>" % (itm, color)
>             except:
>               html += "<option value='%s'>%s</option>" % (itm, itm)
>           html += "</select><br />"
>           print html
>         except:
>           pass
> #      if notSet == 1:
> #        if len(col) > 49:
> #          colX = col[:50] + '...'
> #       else:
> #         colX = col
> #       print '<b>%s: </b>%s<br />\n' % (colX, item)
>     elif col == 'pic1':
>       try:
>         if (item != None):
> #      if (item != None) and (len(item > 0)):
>           print '<a href="getpic.py?store=%s&pic=%s&id=%s" 
> class="highslide" href="getpic.py?store=%s&pic=%s&id=%s" 
> onclick="return hs.expand(this)"><img 
> src="getpic.py?store=%s&pic=%s&id=%s" width="100" height="80" alt="" 
> align="left" border="0" title="Click to enlarge" style="border: 
> 0px"></a><br clear="all" />\n' % (store, col[3:], id, store, col[3:], 
> id, store, col[3:], id)
>       except TypeError:
>         raise
>       except:
>         raise
> #      i += 1
> #      try:
> #        content = item[x].tostring()
> #         pic = "tmp" + str(i) + ".jpg"
> #        try:
> #          os.remove(pic)
> #        except:
> #          pass
> #        img = open(pic, "w")
> #        img.write(content)
> #        print '<img src="%s"><br /><br />' % pic
> #        img.close()
> #      except:
> #        pass
>
> def Store_frame2():
>   top(browser, p)
>   i = 0
>   print '<tr>\n'
>   print '<form method="post" action="cart.py">'
>   print "<input type='hidden' name='store' value='%s' />" % store
>   print "<input type='hidden' name='whatDo' value='insert' />"
>   if pkg == 'no':
>     printAProduct()
>   else:
>     cursor.execute('select ProductID from productsPackages where 
> PackageID=%s' % id)
>     for id in [itm[0] for itm in cursor]:
>       printAProduct(id)
>   if store == 'prescriptions':
>     print "<input type='hidden' name='quantity' value='1' />"
>     print "<input type='submit' value=' Refill ' />"
>   elif truncate()[store] != '':
>     pass
>   else:
>     print "<b>Quantity</b>: <input type='text' name='quantity' 
> width='3' maxlength='3' /><br />"
>     print "<input type='submit' value=' Add To Cart ' />"
>   print '</form>'
>   print '</td></tr></table>\n'
>   print '</table>\n'
>   cursor.close()
>   bottom()
>
> Store_frame2()
>
>
> -- 
> The Logos has come to bear
> http://logos.13gems.com/




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