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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...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
【内核源码】linux UDP实现linux-udp创建udp socket在socket()创建的时候，会设置对应协议的操作集。 inet_dgram_ops是系统调用层直接调用的操作。udp_prot是底层协议的处理。可以看到相比TCP，UDP不用accept(),lis 创建udp socket
在socket()创建...
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...
Numpy array dimensions
I'm currently trying to learn Numpy and Python. Given the following array:
8 Answers
8...
How do I disable “missing docstring” warnings at a file-level in Pylint?
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It is nice for a Python module to have a docstring, explaining what the module does, what it provides, examples of how to use the classes. This is different from the comments that you often see at the beginning of a file giving the copyright ...
What do people think of the fossil DVCS? [closed]
... I like about Fossil:
1) We have a bunch of machines (win/mac/a number of linux distros), and the single-executable installation is just as beautiful as it sounds. No dependencies; it just works. Git is a messy pile of files and the dependency hell in Subversion makes it very nasty on some Linux di...