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Python argparse mutual exclusive group
...llness', '-b x'])
usage: PROG [-h] [--foo] {command_1,command_2} ...
PROG: error: unrecognized arguments: -b x
Good luck.
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Ruby 'require' error: cannot load such file
I've one file, main.rb with the following content:
13 Answers
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How do I print the type of a variable in Rust?
...e of a variable and are willing to do it at compile time, you can cause an error and get the compiler to pick it up.
For example, set the variable to a type which doesn't work:
let mut my_number: () = 32.90;
// let () = x; would work too
error[E0308]: mismatched types
--> src/main.rs:2:29
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What do the different readystates in XMLHttpRequest mean, and how can I use them?
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Errors in the transfer still update readyState to 4. However, a completely interrupted transfer will reset readyState to 0. So, an error in the transfer that's a result of a redirect isn't really an "error" and you can choose...
How to lazy load images in ListView in Android
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There is a bug, sometimes it's fired:10-13 09:58:46.738: ERROR/AndroidRuntime(24250): Uncaught handler: thread main exiting due to uncaught exception 10-13 09:58:46.768: ERROR/AndroidRuntime(24250): java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 0 10-13 09:58:4...
Postgres unique constraint vs index
... master values (0, 0);
INSERT 0 1
test=# insert into master values (0, 1);
ERROR: duplicate key value violates unique constraint "master_con_id_key"
DETAIL: Key (con_id)=(0) already exists.
test=# insert into master values (1, 0);
ERROR: duplicate key value violates unique constraint "master_uniq...
JUnit: how to avoid “no runnable methods” in test utils classes
... run successfully but test utility classes fail with "No runnable methods" error. The pattern I am using is to include all classes with name *Test* under test folder.
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CKEditor instance already exists
...elow is not a good solution as it is an internal API that can also produce errors, it is always better to use instance.destroy(true)
– Bala Clark
May 14 '12 at 12:43
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Writing outputs to log file and console
... running the user script like log file name and path, redirect outputs and errors to log file, database connection details, etc ) which redirects all the outputs ( echo messages ) and errors to the log file from the executed script using the following code:
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Running Bash commands in Python
...ss = subprocess.Popen(bashCommand.split(), stdout=subprocess.PIPE)
output, error = process.communicate()
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