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List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
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With new_list = my_list, you don't actually have two lists. The assignment just copies the reference to the list, not the actual list, so both new_list and my_list refer to the same list after the assignment.
To actually copy the list, you have various possibilit...
How to close IPython Notebook properly?
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So I assume using jupyter notebook & is a bad idea since Ctrl+C does not apply for this situation
– Naveen Dennis
Dec 9 '17 at 2:09
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Why does the MongoDB Java driver use a random number generator in a conditional?
... it is a trivial observation that this piece of code amounts to
if (!_ok && Math.random() <= 0.1)
return res;
The commit that originally introduced this logic had
if (_ok == true) {
_logger.log( Level.WARNING , "Server seen down: " + _addr, e );
} else if (Math.random() < 0.1) {...
How to add column if not exists on PostgreSQL?
...o add column x to table y , but only when x column doesn't exist ? I found only solution here how to check if column exists.
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总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...个类a是基类，b继承a，c和ab没有关系。
有一个函数void function(a&a);
现在有一个对象是b的实例b，一个c的实例c。
function(static_cast<a&>(b)可以通过而function(static<a&>(c))不能通过编译，因为在编译的时候编译器已经知道c和a的类型不...
Remove All Event Listeners of Specific Type
...ent.addEventListener('click2', function(event) {
event = event.detail &amp;&amp; event.detail.original ?
event.detail.original :
event;
// ... do something with event ...
});
However, note that this may not work as well for fast events like mousemove, given that the re-dispa...
Is it possible to specify the schema when connecting to postgres with JDBC?
...ch) to use it:
http://archives.postgresql.org/pgsql-jdbc/2008-07/msg00012.php
http://jdbc.postgresql.org/
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Aborting a shell script if any command returns a non-zero value?
...and is any command not part of an if, while, or until test, or part of an &amp;&amp; or || list.
See the bash(1) man page on the "set" internal command for more details.
I personally start almost all shell scripts with "set -e". It's really annoying to have a script stubbornly continue when somet...
Find and Replace text in the entire table using a MySQL query
Usually I use manual find to replace text in a MySQL database using phpmyadmin. I'm tired of it now, how can I run a query to find and replace a text with new text in the entire table in phpmyadmin?
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Difference between VARCHAR and TEXT in MySQL [duplicate]
...up to 16 MB, LONGTEXT up to 4 GB. If you use LONGTEXT and get the data via PHP (at least if you use mysqli without store_result), you maybe get a memory allocation error, because PHP tries to allocate 4 GB of memory to be sure the whole string can be buffered. This maybe also happens in other langua...