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Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?
In multiple courses, books, and jobs, I have seen text fields defined as VARCHAR(255) as kind of the default for "shortish" text. Is there any good reason that a length of 255 is chosen so often, other than being a nice round number ? Is it a holdout from some time in the past when there was a go...
How do I use pagination with Django class based generic ListViews?
..._data()
df = pd.DataFrame(list(self.model.objects.all().values()))
ipc = df.groupby('ip')['ip'].count().sort_values(ascending=False)
urlc = df.groupby('url')['url'].count().sort_values(ascending=False).to_dict()
ipc = tuple(ipc.to_dict().items())
urlc = tuple(urlc.items())
...
How to configure a HTTP proxy for svn
... @ErikMitchell: Create two versions of the config file and scripts which allow you to switch. Read your OSs docs how to hook into the network discovery mechanism and execute the correct script when your laptop notices where it is.
– Aaron Digulla
O...
What is SaaS, PaaS and IaaS? With examples
...sk image library, block and file-based storage, firewalls, load balancers, IP addresses, virtual local area networks etc.
Examples: Amazon EC2, Windows Azure, Rackspace, Google Compute Engine.
PaaS (Platform as a Service), as the name suggests, provides you computing platforms which typically incl...
What is the difference between OpenID and SAML?
...e of federation. In SAML federations, an account should be a 1:1 relationship with a single person with a current relationship with the IdP "asserting" both the user authentication and authorisation. Entities operating IdPs in a federation must comply with governance around account currency and ver...
那些年 O2O创业我踩了十个坑 - 资讯 - 清泛网 - 专注C/C++及内核技术
...经过去了将近三个月------
然后，接下来还需要协商正式协议，打钱，这一过程又持续了一个月，直至4月底，我们资金才到账。
而此时，有了资金按理说该要大力推广的时刻，可5月份刚好洗衣转入淡季，我们错过了最佳发力的...
Practical non-image based CAPTCHA approaches?
...rflow. This is necessary to prevent bots, spammers, and other malicious scripted activity. We only want human beings to post or edit things here!
...
How do I get the user agent with Flask?
... 'xforwardedfor': str,
'authorization': bool
'ip_info': str or None,
'path': str,
'speed': float,
'date': datetime,
},
{
....
}
]
Here is one of the places in the library where the data is collected:
https://gith...
unable to start mongodb local server
...rt (27017)
command:
sudo netstat -tulpn | grep :27017
Output will be:
tcp 0 0 0.0.0.0:27017 0.0.0.0:*
LISTEN 6432/mongod
In my case "6432" is the pid, it may be different in your case.
Then kill that process using following command:
sudo kill <pid>
Thats ...
How to install Android SDK Build Tools on the command line?
...a stands for --all and -t stands for --filter.
If you need to install multiple packages do:
android update sdk -u -a -t 1,2,3,4,..,n
Where 1,2,..,n is the package number listed with the list command above
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