To install LXML python module in Debian, you need to install depedency packages :
1 | apt-get install python-dev libxml2 libxml2-dev libxslt1-dev libbz2-dev libssl-dev p7zip-full rar lha unrar unzip unace unp bzip2 gzip patch |
Then, you can install lxml by :
1 | pip install lxml |
I found something weird with my Bind in HPCloud which it’s working well in my EC2. After trying several experiment, I found the correct way to set bind in HPCloud. This is for example:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ; ; BIND data file for local loopback interface ; $TTL 3600 @ IN SOA obroll.com. admin.obroll.com. ( 30 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; obroll.com IN A 15.185.178.20 @ IN NS ns1.obroll.com. @ IN A 15.185.178.20 ns1 IN A 15.185.178.20 ns2 IN A 15.185.178.20 www IN A 15.185.178.20 |
Yes, I put my domain name as first 
This is common mistake when we try to nslookup our domain that working with “WWW” but not without “WWW”. This is some bind9 configuration :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | ; ; BIND data file for local loopback interface ; $TTL 3600 @ IN SOA obroll.com. admin.obroll.com. ( 30 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; @ IN NS ns1.obroll.com. ns1 IN A 15.185.178.20 ns2 IN A 15.185.178.20 www IN A 15.185.178.20 |
If you installing MySQL-python from pip in Ubuntu and see this error :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | Downloading/unpacking MySQL-python==1.2.3 (from -r requirements.txt (line 3)) Downloading MySQL-python-1.2.3.tar.gz (70Kb): 70Kb downloaded Running setup.py egg_info for package MySQL-python sh: mysql_config: not found Traceback (most recent call last): File "<string>", line 14, in <module> File "/home/ubuntu/.virtualenvs/trip/build/MySQL-python/setup.py", line 15, in <module> metadata, options = get_config() File "setup_posix.py", line 43, in get_config libs = mysql_config("libs_r") File "setup_posix.py", line 24, in mysql_config raise EnvironmentError("%s not found" % (mysql_config.path,)) EnvironmentError: mysql_config not found Complete output from command python setup.py egg_info: sh: mysql_config: not found Traceback (most recent call last): File "<string>", line 14, in <module> File "/home/ubuntu/.virtualenvs/trip/build/MySQL-python/setup.py", line 15, in <module> metadata, options = get_config() File "setup_posix.py", line 43, in get_config libs = mysql_config("libs_r") File "setup_posix.py", line 24, in mysql_config raise EnvironmentError("%s not found" % (mysql_config.path,)) EnvironmentError: mysql_config not found ---------------------------------------- Command python setup.py egg_info failed with error code 1 in /home/ubuntu/.virtualenvs/trip/build/MySQL-python Storing complete log in /home/ubuntu/.pip/pip.log (trip) ubuntu@ubuntu:~/Tripvillas/tripvillas[yodi]$ pip install -r requirements.txt Downloading/unpacking git+https://github.com/yuchant/django-mailer.git (from -r requirements.txt (line 11)) Cloning https://github.com/yuchant/django-mailer.git to /tmp/pip-PUZNs4-build Running setup.py egg_info for package from git+https://github.com/yuchant/django-mailer.git Downloading/unpacking http://labix.org/download/python-dateutil/python-dateutil-1.5.tar.gz (from -r requirements.txt (line 26)) Downloading python-dateutil-1.5.tar.gz (232Kb): 232Kb downloaded Running setup.py egg_info for package from http://labix.org/download/python-dateutil/python-dateutil-1.5.tar.gz Downloading/unpacking Django==1.3.1 (from -r requirements.txt (line 2)) Running setup.py egg_info for package Django Downloading/unpacking MySQL-python==1.2.3 (from -r requirements.txt (line 3)) Running setup.py egg_info for package MySQL-python sh: mysql_config: not found Traceback (most recent call last): File "<string>", line 14, in <module> metadata, options = get_config() File "setup_posix.py", line 43, in get_config libs = mysql_config("libs_r") File "setup_posix.py", line 24, in mysql_config raise EnvironmentError("%s not found" % (mysql_config.path,)) EnvironmentError: mysql_config not found Complete output from command python setup.py egg_info: sh: mysql_config: not found Traceback (most recent call last): File "<string>", line 14, in <module> metadata, options = get_config() File "setup_posix.py", line 43, in get_config libs = mysql_config("libs_r") File "setup_posix.py", line 24, in mysql_config raise EnvironmentError("%s not found" % (mysql_config.path,)) EnvironmentError: mysql_config not found ---------------------------------------- |
This mean you should install libmysqlclient-dev. On Ubuntu 11.10 Oneiric :
1 | sudo apt-get install libmysqlclient-dev libmysqlclient-dev libmysqlclient16 |
New guys in Django commonly have a headache to see Logger configuration in settings.py. Sometimes people only want use Logger to print error / warning / debug in server development. Here are how to do that.
First, open up your settings.py and see at logger section :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | # A sample logging configuration. The only tangible logging # performed by this configuration is to send an email to # the site admins on every HTTP 500 error. # See http://docs.djangoproject.com/en/dev/topics/logging for # more details on how to customize your logging configuration. LOGGING = { 'version': 1, 'disable_existing_loggers': False, 'handlers': { 'mail_admins': { 'level': 'ERROR', 'class': 'django.utils.log.AdminEmailHandler' } }, 'loggers': { 'django.request': { 'handlers': ['mail_admins'], 'level': 'ERROR', 'propagate': True, }, } } |
Fabric is great tools in Python which can ease our development. You can start installing it by :
1 | sudo pip install fabric |
Let create some example cases here.
1. I have remote server which have port SSH (it a must!) and use SSH-key (PEM) for login.
2. I have django apps that located in PROJECT_PATH (eg: ~/htdocs/pricedag)
So, we need create fabfile.py in PROJECT_PATH :
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Creating REST JSON API in Django in pretty easy. I know several django modules like django-tastypie, django piston, etc provide easy ways to build REST API in Django, but at this time, I will show simple example.
First, we should define our urls. Eg : “/api/search/keyword”
APP/urls.py
1 2 3 4 5 6 | from django.conf.urls.defaults import patterns, url urlpatterns = patterns('price.views', url(r'^api/search/(?P<keyword>[a-zA-Z0-9\s\+]+)$', 'search', name='search'), ) </keyword> |
Requests Module is great python module to use urllib2 in easy ways. For instance, let we get some JSON from my Gravatar :
1 | https://es.gravatar.com/bashlook.json |
In case you need how to get JSON value using urllib2 :
1 2 3 4 5 6 7 8 9 10 11 | import urllib2 import json uri = "https://es.gravatar.com/bashlook.json" opener = urllib2.urlopen(uri) try: result = json.load(opener) except ValueError, e: errorMessage = str(result) + ':' + str(e) return errorMessage |
At this cases, “result” can be accessed as dictionaries, example :
1 | result['entry'] |
We can’t overwrite delete() for deleting FileField and related files in Django. As we know that :
In Django 1.3, when a model is deleted the FileField’s delete() method won’t be called. If you need cleanup of orphaned files, you’ll need to handle it yourself (for instance, with a custom management command that can be run manually or scheduled to run periodically via e.g. cron).
Do you got this error while doing filter QuerySet in Django:
1 | ValueError: invalid literal for int() with base 10: |
It just simply mistake that may you usually do by filter() with args or kwargs.
This is some bad code :
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