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Proper way to declare custom exceptions in modern Python?
What's the proper way to declare custom exception classes in modern Python? My primary goal is to follow whatever standard other exception classes have, so that (for instance) any extra string I include in the exception is printed out by whatever tool caught the exception.
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What is the difference between a string and a byte string?
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Assuming Python 3 (in Python 2, this difference is a little less well-defined) - a string is a sequence of characters, ie unicode codepoints; these are an abstract concept, and can't be directly stored on disk. A byte string is a sequ...
Matrix Transpose in Python
I am trying to create a matrix transpose function for python but I can't seem to make it work.
Say I have
18 Answers
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Python AttributeError: 'module' object has no attribute 'Serial' [duplicate]
I'm trying to access a serial port with Python 2.6 on my Raspberry Pi running Debian.
My script named serial.py tries to import pySerial:
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Adding images or videos to iPhone Simulator
... and Holding on the image. If you drag an image (or any other file, like a PDF) to the simulator, it will immediately open Safari and display the image, so this is quite an easy way of getting images to it.
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How to use “raise” keyword in Python [duplicate]
...ped that in and got "global name 'error' is not defined". To others new to Python, you need "raise Exception('My error!')". You replace "error" with your Exception name. A list of standard exceptions you can use is here: docs.python.org/2/library/exceptions.html
– Curtis Yallop...
Combine --user with --prefix error with setup.py install
I was trying to install Python packages a system I recently gained access to. I was trying to take advantage of Python's relatively new per user site-packages directory , and the new option --user . (The option is currently undocumented , however it exists for Python 2.6+; you can see the help by...
How do I correctly clean up a Python object?
..._del__(self) above fails with an AttributeError exception. I understand Python doesn't guarantee the existence of "global variables" (member data in this context?) when __del__() is invoked. If that is the case and this is the reason for the exception, how do I make sure the object destructs ...
Why can't Python find shared objects that are in directories in sys.path?
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sys.path is only searched for Python modules. For dynamic linked libraries, the paths searched must be in LD_LIBRARY_PATH. Check if your LD_LIBRARY_PATH includes /usr/local/lib, and if it doesn't, add it and try again.
Some more information (source):
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How do I ZIP a file in C#, using no 3rd-party APIs?
...ws 7, I found that if the file entry is a full path, e.g., @"D:\Temp\file1.pdf", the native Windows extractor fails. You may run into this issue if you simply use the filenames resulting from Directory.GetFiles(). Best to extract the file name using Path.GetFileName() for the file entry argument.
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