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How do I change the working directory in Python?
...rectory with:
import os
os.chdir(path)
There are two best practices to follow when using this method:
Catch the exception (WindowsError, OSError) on invalid path. If the exception is thrown, do not perform any recursive operations, especially destructive ones. They will operate on the old pa...
Why use Dijkstra's Algorithm if Breadth First Search (BFS) can do the same thing faster?
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Run Cron job every N minutes plus offset
...se a step value in the minute field that divides evenly into 60.
So to offset the start time, specify the range explicitly and set the first value to the amount of the offset.
Examples
5-59/20 * * * * will run at 5 minutes after, 25 minutes after, and 45 minutes after.
10-59/25 * * * * will run ...
Rename specific column(s) in pandas
...a dictionary and perform the list-comprehension with it's get operation by setting default value as the old name:
col_dict = {'gdp': 'log(gdp)', 'cap': 'cap_mod'} ## key→old name, value→new name
df.columns = [col_dict.get(x, x) for x in df.columns]
Timings:
%%timeit
df.rename(columns={'gd...
Use Font Awesome Icons in CSS
...nt it, without having to add all kinds of messy extra mark-up.
Be sure to set position:relative on your actual text wrapper for the positioning to work.
.mytextwithicon {
position:relative;
}
.mytextwithicon:before {
content: "\25AE"; /* this is your text. You can also use UTF-8 chara...
How to make an alert dialog fill 90% of screen size?
... platform developer Dianne Hackborn in this discussion group post, Dialogs set their Window's top level layout width and height to WRAP_CONTENT. To make the Dialog bigger, you can set those parameters to MATCH_PARENT.
Demo code:
AlertDialog.Builder adb = new AlertDialog.Builder(this);
Dia...
Choose File Dialog [closed]
...his);
switch(id) {
case DIALOG_LOAD_FILE:
builder.setTitle("Choose your file");
if(mFileList == null) {
Log.e(TAG, "Showing file picker before loading the file list");
dialog = builder.create();
return dialog;
...
Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
... entry on caching, I'm gonna narrow it down here.
A cache is organized in sets and lines. At a time, only one set is used, out of which any of the lines it contains can be used. The memory a line can mirror times the number of lines gives us the cache size.
For a particular memory address, we can ...
How to append to New Line in Node.js
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Going to a specific line number using Less in Unix
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