大约有 8,300 项符合查询结果（耗时：0.0272秒） [XML]
Using property() on classmethods
I have a class with two class methods (using the classmethod() function) for getting and setting what is essentially a static variable. I tried to use the property() function with these, but it results in an error. I was able to reproduce the error with the following in the interpreter:
...
How to sort a list of lists by a specific index of the inner list?
I have a list of lists. For example,
10 Answers
10
...
Hidden features of Scala
What are the hidden features of Scala that every Scala developer should be aware of?
28 Answers
...
Converting unix timestamp string to readable date
...Python, and I'd like to convert it to a readable date. When I use time.strftime , I get a TypeError :
15 Answers
...
Big-O for Eight Year Olds? [duplicate]
...ust have a hard time wrapping my head around what they mean conceptually. For example, if one were to perform an O(1) operation on a data structure, I understand that the number of operations it has to perform won't grow because there are more items. And an O(n) operation would mean that you would...
What is the python “with” statement designed for?
I came across the Python with statement for the first time today. I've been using Python lightly for several months and didn't even know of its existence! Given its somewhat obscure status, I thought it would be worth asking:
...
How do you loop in a Windows batch file?
What is the syntax for a FOR loop in a Windows batch file?
8 Answers
8
...
How do I display a text file content in CMD?
I want to display the content of a text file in a CMD window. In addition, I want to see the new lines that added to file, like tail -f command in Unix.
...
Delete sql rows where IDs do not have a match from another table
...
Using LEFT JOIN/IS NULL:
DELETE b FROM BLOB b
LEFT JOIN FILES f ON f.id = b.fileid
WHERE f.id IS NULL
Using NOT EXISTS:
DELETE FROM BLOB
WHERE NOT EXISTS(SELECT NULL
FROM FILES f
...
Pickle incompatibility of numpy arrays between Python 2 and 3
...
This seems like some sort of incompatibility. It's trying to load a "binstring" object, which is assumed to be ASCII, while in this case it is binary data. If this is a bug in the Python 3 unpickler, or a "misuse" of the pickler by numpy, I don't know...