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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', ...
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...
List of lists changes reflected across sublists unexpectedly
...s visible via all three references to it:
x = [1] * 4
l = [x] * 3
print(f"id(x): {id(x)}")
# id(x): 140560897920048
print(
f"id(l[0]): {id(l[0])}\n"
f"id(l[1]): {id(l[1])}\n"
f"id(l[2]): {id(l[2])}"
)
# id(l[0]): 140560897920048
# id(l[1]): 140560897920048
# id(l[2]): 140560897920048
x...
Get the latest record from mongodb collection
...oDB are B-Trees. Searching a B-Tree is a O(logN) operation, so even find({_id:...}) will not provide constant time, O(1) responses.
That stated, you can also sort by the _id if you are using ObjectId for you IDs. See here for details. Of course, even that is only good to the last second.
You may t...
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
|
...
How to write to Console.Out during execution of an MSTest test
...
so basically, Trace.Listeners.Add(new TextWriterTraceListener(Console.Out)); Trace.WriteLine("Hello World");
– Marty Neal
Feb 18 '11 at 21:08
...
Saving images in Python at a very high quality
...and trying to get good figures in a latex document, save as an eps. Specifically, try something like this after running the commands to plot the image:
plt.savefig('destination_path.eps', format='eps')
I have found that eps files work best and the dpi parameter is what really makes them look good...
MySQL Error 1093 - Can't specify target table for update in FROM clause
...n case certain operations are carried out, merging cannot happen. E.g. provide the derived dummy table with a LIMIT (to inifity) and the error will never occur. That's pretty hackish though and there is still the risk that future versions of MySQL will support merging queries with LIMIT after all.
...