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How to use mod operator in bash?
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Try the following:
for i in {1..600}; do echo wget http://example.com/search/link$(($i % 5)); done
The $(( )) syntax does an arithmetic evaluation of the contents.
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Javascript - sort array based on another array
..., 'b']
]
sorting = [ 'b', 'c', 'b', 'b', 'c', 'd' ];
result = []
sorting.forEach(function(key) {
var found = false;
items = items.filter(function(item) {
if(!found && item[1] == key) {
result.push(item);
found = true;
return false;
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In Python, what is the difference between “.append()” and “+= []”?
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For your case the only difference is performance: append is twice as fast.
Python 3.0 (r30:67507, Dec 3 2008, 20:14:27) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more informat...
Django - how to create a file and save it to a model's FileField?
...iles.File or django.core.files.base.ContentFile (see given links to manual for the details). The two choices boil down to:
# Using File
f = open('/path/to/file')
self.license_file.save(new_name, File(f))
# Using ContentFile
self.license_file.save(new_name, ContentFile('A string with the file conten...
How to check if variable is string with python 2 and 3 compatibility
...except NameError:
basestring = str
then, assuming you've been checking for strings in Python 2 in the most generic manner,
isinstance(s, basestring)
will now also work for Python 3+.
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Getting JavaScript object key list
...2: 'value2',
key3: 'value3',
key4: 'value4'
};
var keys = [];
for (var k in obj) keys.push(k);
alert("total " + keys.length + " keys: " + keys);
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improve this answer
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In Django, how do I check if a user is in a certain group?
...oup(name = "Editor")
group.save() # save this new group for this example
user = User.objects.get(pk = 1) # assuming, there is one initial user
user.groups.add(group) # user is now in the "Editor" group
then user.groups.all() returns [<Group: Editor>].
Alternativ...
How can I force users to access my page over HTTPS instead of HTTP?
I've got just one page that I want to force to be accessed as an HTTPS page (PHP on Apache). How do I do this without making the whole directory require HTTPS? Or, if you submit a form to an HTTPS page from an HTTP page, does it send it by HTTPS instead of HTTP?
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Cannot resolve the collation conflict between “SQL_Latin1_General_CP1_CI_AS” and “Latin1_General_CI_
...ifferent collations within a single table or database - you're only asking for trouble....
Once you've settled for one single collation, you can change those tables / columns that don't match yet using this command:
ALTER TABLE YourTableName
ALTER COLUMN OffendingColumn
VARCHAR(100) COLLATE ...
ImportError: Cannot import name X
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You have circular dependent imports. physics.py is imported from entity before class Ent is defined and physics tries to import entity that is already initializing. Remove the dependency to physics from entity module.
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