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Why does the C++ map type argument require an empty constructor when using []?
... Why is that std::<map>::value_type there in the insert call?
– thomthom
May 6 '15 at 11:53
...
datetime dtypes in pandas read_csv
...way of solving this
The pandas.read_csv() function has a keyword argument called parse_dates
Using this you can on the fly convert strings, floats or integers into datetimes using the default date_parser (dateutil.parser.parser)
headers = ['col1', 'col2', 'col3', 'col4']
dtypes = {'col1': 'str', ...
Logical operators for boolean indexing in Pandas
... guess, and instead raise a ValueError.
Instead, you must be explicit, by calling the empty(), all() or any() method to indicate which behavior you desire.
In this case, however, it looks like you do not want boolean evaluation, you want element-wise logical-and. That is what the & binary oper...
How do you clear the focus in javascript?
...
You can call window.focus();
but moving or losing the focus is bound to interfere with anyone using the tab key to get around the page.
you could listen for keycode 13, and forego the effect if the tab key is pressed.
...
Accessing MP3 metadata with Python [closed]
...other day with a lot of success. I found that it could add artwork to the ID3 tag which the other modules I looked at couldn't. You'll have to install using pip or download the tar and execute python setup.py install from the source folder.
Relevant examples from the website are below.
Reading...
Operation on every pair of element in a list
...Odd, when I run itertools.product(my_list, 2), it complains that int isn't callable. Works once I change it to: itertools.product(my_list, repeat=2)
– ojrac
Jun 3 '09 at 0:34
...
JS Client-Side Exif Orientation: Rotate and Mirror JPEG Images
...ion extraction demo.
function resetOrientation(srcBase64, srcOrientation, callback) {
var img = new Image();
img.onload = function() {
var width = img.width,
height = img.height,
canvas = document.createElement('canvas'),
ctx = canvas.getContext("2d");
// s...
Ignoring an already checked-in directory's contents?
...
For a subdirectory called blah/ added to git, both of the following seem to work to ignore new files in blah/. Added to .gitignore:
blah
blah/*
share
|
...
SQL DROP TABLE foreign key constraint
...ver 2005 and up):
SELECT *
FROM sys.foreign_keys
WHERE referenced_object_id = object_id('Student')
and if there are any, with this statement here, you could create SQL statements to actually drop those FK relations:
SELECT
'ALTER TABLE [' + OBJECT_SCHEMA_NAME(parent_object_id) +
'].['...
dyld: Library not loaded … Reason: Image not found
... wrote a python script (copy_dylibs.py) to work out all this stuff automatically when building an app. It will package up all libraries from /usr/local or /opt/local into the app bundle and fix references to those libraries to use @rpath. This means you can easily install third-party library using...