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How do I look inside a Python object?
...-in functions:
type()
dir()
id()
getattr()
hasattr()
globals()
locals()
callable()
type() and dir() are particularly useful for inspecting the type of an object and its set of attributes, respectively.
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Increment a database field by 1
...r perhaps you're looking for something like INSERT...MAX(logins)+1? Essentially you'd run a query much like the following - perhaps a bit more complex depending on your specific needs:
INSERT into mytable (logins)
SELECT max(logins) + 1
FROM mytable
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How to limit depth for recursive file list?
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Make use of find's options
There is actually no exec of /bin/ls needed;
Find has an option that does just that:
find . -maxdepth 2 -type d -ls
To see only the one level of subdirectories you are interested in, add -mindepth to the same level as -maxdepth:
find . -...
How to get Core Data object from specific Object ID?
...fault object with the provided objectID, whether or not such an object actually exists in the store. If it doesn't exist, anything that fires the fault will fail unless you insert the object first with NSManagedObjectContext's insertObject:. The only use I've found for this is copying objects from s...
Places where JavaBeans are used?
What is a JavaBean and why do I need it? Since I can create all apps with the class and interface structure? Why do I need beans? And can you give me some examples where beans are essential instead of classes and interfaces?
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Possible heap pollution via varargs parameter
...hrow a CCE
B b = listOfBs.get(0);
@SafeVarargs does not prevent this at all. However, there are methods which provably will not pollute the heap, the compiler just can't prove it. Previously, callers of such APIs would get annoying warnings that were completely pointless but had to be suppressed ...
What is a StoryBoard ID and how can i use this?
...ould be from any ViewController:
//Maybe make a button that when clicked calls this method
- (IBAction)buttonPressed:(id)sender
{
MyCustomViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"MyViewController"];
[self presentViewController:vc animated:YES completi...
What is the difference between .map, .every, and .forEach?
I've always wondered what the difference between them were. They all seem to do the same thing...
4 Answers
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Exclude a sub-directory using find
...terating into the directory structure and using cpu cycles to iterate over all those directories/files. to prevent find from iterating over those directories/files (maybe there are millions of files there) then you need to use -prune (the -prune option is difficult to use however).
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MySql server startup error 'The server quit without updating PID file '
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Did you follow the instructions from brew install mysql?
Set up databases to run AS YOUR USER ACCOUNT with:
For mysql 5.x:
unset TMPDIR
mysql_install_db --verbose --user=`whoami` --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp
To set...