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Single vs Double quotes (' vs ")
...rendered HTML which always uses double quotes. This allows me to determine if the HTML was written by hand or generated. Is this a good idea?
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Easiest way to detect Internet connection on iOS?
...rry background, making requests through HTTPUrlConnection instantly fail if there is no connection available. This seems like completely sane behavior, and I was surprised to find NSURLConnection in iOS did not emulate it.
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submitting a GET form with query string params and hidden params disappear
... browser retaining any existing query string in the action URL.
As the specifications (RFC1866, page 46; HTML 4.x section 17.13.3) state:
If the method is "get" and the action is an HTTP URI, the user agent takes the value of action, appends a `?' to it, then appends the form data set, encoded usin...
How do I check if file exists in Makefile so I can delete it?
In the clean section of my Makefile I am trying to check if the file exists before deleting permanently. I use this code but I receive errors.
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How does “304 Not Modified” work exactly?
My guess, if it's generated by the browser:
2 Answers
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Check if value already exists within list of dictionaries?
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Here's one way to do it:
if not any(d['main_color'] == 'red' for d in a):
# does not exist
The part in parentheses is a generator expression that returns True for each dictionary that has the key-value pair you are looking for, otherwise False.
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How to trigger event when a variable's value is changed?
...of 1 then a certain piece of code is carried out.
I know that I can use an if statement but the problem is that the value will be changed in an asynchronous process so technically the if statement could be ignored before the value has changed.
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How to detect Windows 64-bit platform with .NET?
...onment.Is64BitOperatingSystem.
IntPtr.Size won't return the correct value if running in 32-bit .NET Framework 2.0 on 64-bit Windows (it would return 32-bit).
As Microsoft's Raymond Chen describes, you have to first check if running in a 64-bit process (I think in .NET you can do so by checking IntP...
Batch file to delete files older than N days
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For more goodies, refer to An A-Z Index of the Windows XP command line.
If you don't have forfiles installed on your machine, copy it from any Windows Server 2003 to your Windows XP machine at %WinDir%\system32\. This is possible since the EXE is fully compatible between Windows Server 2003 ...
How do you get the logical xor of two variables in Python?
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If you're already normalizing the inputs to booleans, then != is xor.
bool(a) != bool(b)
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