TemplateSyntaxError at /

Caught VariableDoesNotExist while rendering: Failed lookup for key [request] in...

you are probably using a template tag that requires the request context processor. Simply add ‘django.core.context_processors.request’ to the TEMPLATE_CONTEXT_PROCESSORS tuple in your settings file.

If you want to delete all items from Solr index, use the query

<delete><query>*:*</query></delete>

as described in the FAQ on the Solr Wiki.

But how do you actually send this query? You can use this command:

curl http://<host>:<port>/<solr_base>/update?commit=true -d '<delete><query>*:*</query></delete>'

Just replace the placeholders with the right values, e.g.

curl http://localhost:8983/solr/update?commit=true -d  '<delete><query>*:*</query></delete>'

If Solr responds with something like this:

HTTP Status 400 - missing content stream
Status report
message missing content stream
description The request sent by the client was syntactically incorrect (missing content stream).

then you are probably missing the commit parameter i.e. ?commit=true

After some tries, I came to the conclusion that this puzzle is the work of the devil and that I should not waste more brain cycles on solving it. So I wrote a little python script to solve the puzzle for me.

Show sourcecode

#!/usr/bin/python
 
COLORS = dict(zip((1 << i for i in range(6)), ('P','Y','O','B','R','G')))
COLORS[False] = 'X'
 
used_towers = [0 for i in range(6)]
 
cube = ((1,3,4,5,2,0),
        (2,5,0,4,1,3),
        (0,1,3,2,5,4),
        (5,4,1,3,0,2),
        (4,2,5,0,3,1),
        (3,0,2,1,4,5))
 
solution = [[False for x in range(6)] for x in range(6)]
used = tuple(set() for i in range(6))
 
def test_color(pos, solution, used_towers, color, size):
 #check if tower of this size and color has already been used
 if color & used_towers[size]:
  return False
 #check if tower has already been used in row or column:
 for i in range(6):
  if color == solution[pos/6][i]: return False
  if color == solution[i][pos%6]: return False
 return True
 
def print_solution(solution):
 for i in range(6):
  print zip((COLORS[c] for c in solution[i]), (6 - s for s in cube[i]))
 
def solve(pos, solution, used_towers, best):
 if pos == 36: return best, solution
 size = cube[pos/6][pos%6]
 for i in range(6):
  color = 1 << i
  if test_color(pos, solution, used_towers, color, size):
   used_towers[size] = used_towers[size] | color
   solution[pos/6][pos%6] = color
   if pos > best:
    print "#######", pos + 1, "towers placed"
    print_solution(solution)
    best = pos
   best, solution = solve(pos+1, solution, used_towers, best)
   if best >= 35:
    return best, solution
   solution[pos/6][pos%6] = False
   used_towers[size] = used_towers[size] ^ color
 return best, solution
 
solve(0, solution, used_towers, 0)

My program quickly came up with a correct placement for 34 towers – but it failed to find the complete solution.

[('P', 5), ('Y', 3), ('O', 2), ('B', 1), ('R', 4), ('G', 6)]
[('Y', 4), ('O', 1), ('P', 6), ('R', 2), ('G', 5), ('B', 3)]
[('O', 6), ('B', 5), ('R', 3), ('G', 4), ('P', 1), ('Y', 2)]
[('R', 1), ('G', 2), ('Y', 5), ('P', 3), ('B', 6), ('O', 4)]
[('B', 2), ('P', 4), ('G', 1), ('Y', 6), ('O', 3), ('R', 5)]
[('G', 3), ('R', 6), ('B', 4), ('O', 5), ('X', 2), ('X', 1)]

Legend:
P = Purple, Y = Yellow, O = Orange, B = Blue, R = Red, G = Green, X = Empty
The number is the size of the tower.
As you can see, I didn’t waste much time on making the output pretty

So close and yet so far

After spending lots of time verifying that my program was working correctly, I became impatient and googled for help. I found an answer, but it revealed to much, taking all the fun.

Therefore, I split my solution into multiple hints. If you are stuck, reveal just one of them at a time and try to figure it out by yourself. It is way more rewarding!

Hint #1 (show): Your assumptions are probably wrong.
Now go back and try to solve it. I’m waiting here.

Hint #2 (show): The assumption that all towers of the same size only differ in color is wrong.

Hint #3 (show): There are two towers which do fit on slots where the other towers of the same size do not fit.

Hint #4 (show): The two special towers are the yellow one of heigh 5 and the orange one of height 6.

Hint #5 (show): The yellow tower of height 5 has to go to position (1,2) and the orange tower of height 6 to (3,2) in my coordinate system.

Even if you uncovered all hints, the puzzle is still far from solved. You can still tinker with it forever.

Spoiler alert: Don’t uncover the solution, unless your are really desperate!

Click to show the 36cube solution.

After I had found the two culprits, I adjusted my program by changing the array and inserting two special conditions. Within seconds I had a complete solution of the 36 Cube:

[('P', 5), ('Y', 3), ('B', 2), ('O', 1), ('R', 4), ('G', 6)]
[('B', 4), ('P', 1), ('Y', 5), ('G', 2), ('O', 5), ('R', 3)]
[('R', 6), ('G', 5), ('P', 3), ('Y', 4), ('B', 1), ('O', 2)]
[('G', 1), ('R', 2), ('O', 6), ('B', 3), ('Y', 6), ('P', 4)]
[('Y', 2), ('O', 4), ('R', 1), ('P', 6), ('G', 3), ('B', 5)]
[('O', 3), ('B', 6), ('G', 4), ('R', 5), ('P', 2), ('Y', 1)]

Finally solved

#!/usr/bin/python
 
COLORS = dict(zip((1 << i for i in range(6)), ('P','Y','O','B','R','G')))
COLORS[False] = 'X'
 
used_towers = [0 for i in range(6)]
 
# definition with (1,2) and (3,2) switched
cube = ((1,3,4,5,2,0),
        (2,5,1,4,1,3),
        (0,1,3,2,5,4),
        (5,4,0,3,0,2),
        (4,2,5,0,3,1),
        (3,0,2,1,4,5))
 
solution = [[False for x in range(6)] for x in range(6)]
used = tuple(set() for i in range(6))
 
def test_color(pos, solution, used_towers, color, size):
 #check if tower of this size and color has already been used
 if color & used_towers[size]:
  return False
 #check if tower has already been used in row or column:
 for i in range(6):
  if color == solution[pos/6][i]: return False
  if color == solution[i][pos%6]: return False
 # special conditions for the two special towers
 if (pos/6, pos%6) == (1,2) and color != 2: return False
 if (pos/6, pos%6) == (3,2) and color != 4: return False
 return True
 
def print_solution(solution):
 for i in range(6):
  print zip((COLORS[c] for c in solution[i]), (6 - s for s in cube[i]))
 
def solve(pos, solution, used_towers, best):
 if pos == 36: return best, solution
 size = cube[pos/6][pos%6]
 for i in range(6):
  color = 1 << i
  if test_color(pos, solution, used_towers, color, size):
   used_towers[size] = used_towers[size] | color
   solution[pos/6][pos%6] = color
   if pos > best:
    print "#######", pos + 1, "towers placed"
    print_solution(solution)
    best = pos
   best, solution = solve(pos+1, solution, used_towers, best)
   if best >= 35:
    return best, solution
   solution[pos/6][pos%6] = False
   used_towers[size] = used_towers[size] ^ color
 return best, solution
 
solve(0, solution, used_towers, 0)

Downloading update from http://downloads.wordpress.org/plugin/xxx.zip.

Unpacking the update.
Warning: unlink(/…/wp-content/upgrade/xxx.zip) [function.unlink]: No such file or directory in /…/wp-admin/includes/class-wp-upgrader.php on line 146

Incompatible archive PCLZIP_ERR_MISSING_FILE (-4) : Missing archive file ‘/…/wp-content/upgrade/wp-syntax.0.9.8.zip’

After digging through the forums I found a solution to the plugin autoupdate problem in the WordPress Support forum.

Open the file wp-config.php in the root directory of your WordPress installation and remove the definition of the WP_TEMP_DIR variable, i.e. a line that looks like this

define('WP_TEMP_DIR', ABSPATH . "wp-content/upgrade");

Auf das Symbol des Netzwerk-Manager-Applet klicken:

Das Netzwerk dukath-??x auswählen.

?? hängt vom Standort ab. Beim RZ gibt es eine Übersicht über die verwendeten SSIDs.

Auswahl DUKATH-Accesspoint

Im darauf folgenden Dialog die richtigen Werte eintragen:

Einstellungen DUKATH

Bei Zertifikat sollte das Deutsche Telekom Root CA 2 Zertifikat ausgewählt werden.

Benutzername und Passwort entsprechen denen bei der Verwendung von VPN.

Fertig!

[1] Der Zugang über das DUKATH Web-Interface sollte nur in Notfällen genutzt werden, da die Verbindung nicht verschlüsselt wird und deshalb einfach abgehört werden kann.