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What is the python “with” statement designed for?
... os.chdir(current_dir)
with working_directory("data/stuff"):
# do something within data/stuff
# here I am back again in the original working directory
Here's another example that temporarily redirects sys.stdin, sys.stdout and sys.stderr to some other file handle and restores them late...
What does a lazy val do?
I noticed that Scala provide lazy vals . But I don't get what they do.
7 Answers
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Switching from zsh to bash on OSX, and back again?
..., I just feel comfortable with the lay out of bash in some situations. How do I switch back and forth, or turn zsh on and off? Thanks!
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Best way to structure a tkinter application? [closed]
...expand=True)
root.mainloop()
The important things to notice are:
I don't use a wildcard import. I import the package as "tk", which requires that I prefix all commands with tk.. This prevents global namespace pollution, plus it makes the code completely obvious when you are using Tkinter cla...
How do you use script variables in psql?
... have both a quoted and unquoted variable of the same string! And you can do something like this ....
INSERT INTO :myvariable.table1 SELECT * FROM table2 WHERE column1 = :quoted_myvariable;
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How do you debug MySQL stored procedures?
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I do something very similar to you.
I'll usually include a DEBUG param that defaults to false and I can set to true at run time. Then wrap the debug statements into an "If DEBUG" block.
I also use a logging table with man...
How do you rename a table in SQLite 3.0?
How do you rename a table in SQLite 3.0?
2 Answers
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How to change identity column values programmatically?
...en delete your row and reinsert it with different identity.
Once you have done the insert don't forget to turn identity_insert off
set identity_insert YourTable OFF
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One DbContext per web request… why?
..., you probably still want to Dispose all created instances. If you want to do this, you basically have two options. You need to dispose them in the same method right after calling context.SaveChanges(), but in that case the business logic takes ownership of an object it gets passed on from the outsi...
How do I create a datetime in Python from milliseconds?
...reate a similar Date object in Java by java.util.Date(milliseconds) . How do I create the comparable in Python?
5 Answers
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