大约有 11,000 项符合查询结果（耗时：0.0244秒） [XML]
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
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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 ...
Extract file name from path, no matter what the os/path format
Which Python library can I use to extract filenames from paths, no matter what the operating system or path format could be?
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Keystore type: which one to use?
...urther reading:
Mind Your Keys? A Security Evaluation of Java Keystores (PDF)
Java KeyStores – the gory details
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What is an efficient way to implement a singleton pattern in Java? [closed]
... video. Also see slides 30-32 of his presentation (effective_java_reloaded.pdf):
The Right Way to Implement a Serializable Singleton
public enum Elvis {
INSTANCE;
private final String[] favoriteSongs =
{ "Hound Dog", "Heartbreak Hotel" };
public void printFavorites() {
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How can I quantify difference between two images?
...ot, you may need to resize or crop them. PIL library will help to do it in Python.
If they are taken with the same settings and the same device, they are probably the same.
Are images well-aligned?
If not, you may want to run cross-correlation first, to find the best alignment first. SciPy has fun...
How do I get the picture size with PIL?
How do I get a size of a pictures sides with PIL or any other Python library?
7 Answers
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Does pandas iterrows have performance issues?
...pply
a) reductions that can be performed in cython
b) iteration in python space
4) itertuples
5) iterrows
6) updating an empty frame (e.g. using loc one-row-at-a-time)
Using a custom Cython routine is usually too complicated, so let's skip that for now.
1) Vectorization is ALWAYS, ALWAYS ...