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Python != operation vs “is not”
...e done, objects can't influence the is operation.
You use is (and is not) for singletons, like None, where you don't care about objects that might want to pretend to be None or where you want to protect against objects breaking when being compared against None.
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Solving “Who owns the Zebra” programmatically?
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# They all drink different drinks.
# They all smoke different cigarettes.
for vars_ in (colors, nationalities, pets, drinks, cigarettes):
problem.addConstraint(AllDifferentConstraint(), vars_)
# In the middle house they drink milk.
#NOTE: interpret "middle" in a numerical sense (not geometrica...
What does “#define _GNU_SOURCE” imply?
...to traditional functions which were omitted from the POSIX standard (often for good reason, such as being replaced with better alternatives, or being tied to particular legacy implementations)
access to low-level functions that cannot be portable, but that you sometimes need for implementing system ...
Making custom right-click context menus for my web-app
...ppets as they're a really cool new feature. I leave the good jsfiddle here for reference thought (click on the 4th panel to see them work).
New Stack Snippet:
// JAVASCRIPT (jQuery)
// Trigger action when the contexmenu is about to be shown
$(document).bind("contextmenu", function (event) ...
Ignore python multiple return value
...
One common convention is to use a "_" as a variable name for the elements of the tuple you wish to ignore. For instance:
def f():
return 1, 2, 3
_, _, x = f()
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improv...
How to capture stdout output from a Python function call?
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Thanks! And thanks for adding the advanced section... I originally used a slice assignment to stick the captured text into the list, then I bonked myself in the head and used .extend() instead so it could be used concatenatively, just as you no...
Asking the user for input until they give a valid response
...ates.")
Encapsulating it All in a Function
If you need to ask your user for a lot of different values, it might be useful to put this code in a function, so you don't have to retype it every time.
def get_non_negative_int(prompt):
while True:
try:
value = int(input(prompt...
File Upload ASP.NET MVC 3.0
...ow to achieve this in ASP.NET MVC.
So you would start by creating an HTML form which would contain a file input:
@using (Html.BeginForm("Index", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
<input type="file" name="file" />
<input type="submit" value="OK" /...
List all the files that ever existed in a Git repository
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This is a simplified variation of Strager's solution:
git log --pretty=format: --name-status | cut -f2- | sort -u
Edit: Thanks to Jakub for teaching me a bit more in the comments, this version has a shorter pipeline and gives git more opportunity to get things right.
git log --pretty=format: ...
Shared-memory objects in multiprocessing
...ther parameters). func with different parameters can be run in parallel. For example:
4 Answers
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