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In Java, when should I create a checked exception, and when should it be a runtime exception? [dupli
...pections for recoverable conditions and runtime exceptions for programming errors (Item 58 in 2nd edition).
So in this case, if you really want to use exceptions, it should be a checked one. (Unless the documentation of transferTo() made it very clear that the method must not be called without che...
PDOException “could not find driver”
...in your code reveals you are trying to connect with the mysql driver. Your error message indicates that this driver is unavailable.
Check that you have the mysql extension installed on your server.
In Ubuntu/Debian you check for the package with:
dpkg --get-selections | grep php | grep mysql
In...
Recursive search and replace in text files on Mac and Linux
...that. I did however try using {} to separate the slash and I still got an error...
– Timothy T.
Sep 19 '13 at 2:39
16
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How to tell if a string is not defined in a Bash shell script
...o use a default value, ${foo:=default} to assign the default value, ${foo:?error message} to display an error message if foo is unset, etc.
– Jouni K. Seppänen
Oct 23 '08 at 4:54
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How to install therubyracer gem on 10.10 Yosemite?
...t helps without any weirdness. Even though you may just be getting a libv8 error, do this! thanks.
– pjammer
Nov 2 '14 at 18:55
2
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In the shell, what does “ 2>&1 ” mean?
...iptor 1 is the standard output (stdout).
File descriptor 2 is the standard error (stderr).
Here is one way to remember this construct (although it is not entirely accurate): at first, 2>1 may look like a good way to redirect stderr to stdout. However, it will actually be interpreted as "redirect...
Check whether user has a Chrome extension installed
...{version: '1.0'} and not {version: 1.0} or else you'll get 'Uncaught SyntaxError: Unexpected number' in extension Inspect view console.
– ET-CS
Jan 26 '15 at 5:01
1
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How do I convert dates in a Pandas data frame to a 'date' data type?
...:00:00
1 2 2013-01-02 00:00:00
2 3 2013-01-03 00:00:00
Handling ValueErrors
If you run into a situation where doing
df['time'] = pd.to_datetime(df['time'])
Throws a
ValueError: Unknown string format
That means you have invalid (non-coercible) values. If you are okay with having them co...
Relative imports in Python 3
...)[0] returns empty string. This is why there's empty string literal in the error description:
SystemError: Parent module '' not loaded, cannot perform relative import
The relevant part of the CPython's PyImport_ImportModuleLevelObject function:
if (PyDict_GetItem(interp->modules, package) == ...
How do I redirect in expressjs while passing some context?
... show up and reset the next time you go to a page. It's handy for showing errors to users, but again it's been removed by default. EDIT: Found a library that adds this functionality.
Hopefully that will give you a general idea how to pass information around in an Express application.
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