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ImportError: Cannot import name X
...or a different reason...
from my_sub_module import my_function
The main script had Windows line endings. my_sub_module had UNIX line endings. Changing them to be the same fixed the problem. They also need to have the same character encoding.
...
How to exit from the application and show the home screen?
...needs internet and the connection breaks a few activities into the app. An alert dialog can be displayed (without buttons). The Back button needs to exit the entire app since reentry requires login/initialization again. System.exit is the only thing that works reasonably I've found. Not sure about @...
MySQL: #126 - Incorrect key file for table
...orrupt partition file:
rm -fv /usr/tmpDSK
Then create a nice new one:
/scripts/securetmp
Note that by editing the securetmp Perl script you can manually set the size of the tmp directory yourself, however just running the script increased the size of the tmp directory on our server from roughl...
Get selected option text with JavaScript
...
Try options
function myNewFunction(sel) {
alert(sel.options[sel.selectedIndex].text);
}
<select id="box1" onChange="myNewFunction(this);">
<option value="98">dog</option>
<option value="7122">cat</option>
<option value="142...
Regular Expression to reformat a US phone number in Javascript
...lace(/\D+/g, '')
.replace(/(\d{3})(\d{3})(\d{4})/, '($1) $2-$3');
alert(x);
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Load local JSON file into variable
I'm trying to load a .json file into a variable in javascript, but I can't get it to work. It's probably just a minor error but I can't find it.
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What generates the “text file busy” message in Unix?
...ns, with a sleep command, before running the file:
chmod a+x /usr/bin/php/scripts/phpize \
&& sleep 1 \
&& /usr/bin/php/scripts/phpize
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querySelector and querySelectorAll vs getElementsByClassName and getElementById in JavaScript
...e-vs-queryselectorall/25. Conclusion : one should far more prefer pure javascript than jquery, and the specific functions getElementById and getElementsByClassName. The className selection can be few hundreds times slower without getElementsByClassName.
– Atrahasis
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Create an index on a huge MySQL production table without table locking
... MySQL is really, really stupid about this (and a few other things).
Test Script:
(
for n in {1..50}; do
#(time mysql -uroot -e 'select * from website_development.users where id = 41225\G'>/dev/null) 2>&1 | grep real;
(time mysql -uroot -e 'update website_development.users ...
How to run a program without an operating system?
...he case for regular userland executables.
To better understand the linker script part, familiarize yourself with the relocation step of linking: What do linkers do?
Cooler x86 bare metal programs
Here are a few more complex bare metal setups that I've achieved:
multicore: What does multicore assem...