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What is the meaning of the term arena in relation to memory?
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From http://www.bozemanpass.com/info/linux/malloc/Linux_Heap_Contention.html:
The libc.so.x shared library contains the glibc component and the heap
code resides inside it. The current implementation of the heap uses
multiple independent sub-heaps called...
Pass a parameter to a fixture function
I am using py.test to test some DLL code wrapped in a python class MyTester.
For validating purpose I need to log some test data during the tests and do more processing afterwards. As I have many test_... files I want to reuse the tester object creation (instance of MyTester) for most of my tests.
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Difference between staticmethod and classmethod
... function into a class because it logically belongs with the class. In the Python source code (e.g. multiprocessing,turtle,dist-packages), it is used to "hide" single-underscore "private" functions from the module namespace. Its use, though, is highly concentrated in just a few modules -- perhaps an...
How to check a string for specific characters?
How can I check if a string has several specific characters in it using Python 2?
5 Answers
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Difference between __str__ and __repr__?
What is the difference between __str__ and __repr__ in Python?
23 Answers
23
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How do I check if a variable exists?
...d is likely to result in unpredictable behaviour.
If you need to do it in Python, the following trick, which is similar to yours, will ensure that a variable has some value before use:
try:
myVar
except NameError:
myVar = None
# Now you're free to use myVar without Python complaining.
H...
How to get string objects instead of Unicode from JSON?
I'm using Python 2 to parse JSON from ASCII encoded text files.
21 Answers
21
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Pip install Matplotlib error with virtualenv
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Building Matplotlib requires libpng (and freetype, as well) which isn't a python library, so pip doesn't handle installing it (or freetype).
You'll need to install something along the lines of libpng-devel and freetype-devel (or whatever the equivalent is for your OS).
See the building requirem...
Why are trailing commas allowed in a list?
I am curious why in Python a trailing comma in a list is valid syntax, and it seems that Python simply ignores it:
5 Answer...
Encoding an image file with base64
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With python 2.x, you can trivially encode using .encode:
with open("path/to/file.png", "rb") as f:
data = f.read()
print data.encode("base64")
s...