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Eclipse copy/paste entire line keyboard shortcut
...Ctrl-Shift-L: brings up a List of shortcut keys
See Windows/Preference->General->Keys.
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Why can't Python's raw string literals end with a single backslash?
...catenation, for it's not the right way to do it anyway! use os.path.join
>>> import os
>>> os.path.join(r"C:\mypath", "subfolder")
'C:\\mypath\\subfolder'
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Crontab Day of the Week syntax
...─── month (1 - 12)
│ │ │ │ ┌── day of week (0 - 6 => Sunday - Saturday, or
│ │ │ │ │ 1 - 7 => Monday - Sunday)
↓ ↓ ↓ ↓ ↓
* * * * * command to be executed
Finally, if you want to specify day by day, you can separate days with commas, ...
Compare if two variables reference the same object in python
...mbers this only returns true if one object is initialized form the other.
> i = 13
> j = 13
> i is j
True
> a = 280
> b = 280
> a is b
False
> a = b
> a
280
> a is b
True
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RabbitMQ / AMQP: single queue, multiple consumers for same message?
...unction (message) {
console.log("[MSG] ---> " + JSON.stringify(message));
conn.write(JSON.stringify(message) + "\n");
}).addCallback(function(ok) {
ctag[conn.channel] = ok.c...
Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...yte address of your variable is X, than the cache line for it would be (X >> 6) & (L - 1). Where L is total number of cache lines in your cache. L is always power of 2.
The six comes from fact that 2^6 == 64 bytes is standard size of cache line.
Now what does this mean? Well it means tha...
How do you convert a time.struct_time object into a datetime object?
...aive datetime object representing local time may be ambiguous (timestamp -> local time is deterministic (if we ignore leap seconds) but local time -> timestamp may be ambiguous e.g., during end-of-DST transition). Also, fromtimestamp()` may choose a wrong utc offset if the it doesn't use a his...
MySQL: Quick breakdown of the types of joins [duplicate]
...
I have 2 tables like this:
> SELECT * FROM table_a;
+------+------+
| id | name |
+------+------+
| 1 | row1 |
| 2 | row2 |
+------+------+
> SELECT * FROM table_b;
+------+------+------+
| id | name | aid |
+------+------+------+
| ...
How to len(generator()) [duplicate]
...
Generators have no length, they aren't collections after all.
Generators are functions with a internal state (and fancy syntax). You can repeatedly call them to get a sequence of values, so you can use them in loop. But they don't contain any ele...
Ruby, remove last N characters from a string?
... readable than other answers here):
'abc123'.delete_suffix('123') # => "abc"
'abc123'.delete_suffix!('123') # => "abc"
It's even significantly faster (almost 40% with the bang method) than the top answer. Here's the result of the same benchmark:
user system ...