大约有 16,000 项符合查询结果（耗时：0.0313秒） [XML]
CSS background image alt attribute
This is one I have not had to tackle before. I need to use alt tags on all images in a site including those used by CSS background-image attribute.
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No Multiline Lambda in Python: Why not?
I've heard it said that multiline lambdas can't be added in Python because they would clash syntactically with the other syntax constructs in Python. I was thinking about this on the bus today and realized I couldn't think of a single Python construct that multiline lambdas clash with. Given that ...
How to open a specific port such as 9090 in Google Compute Engine
I have 2 Google Compute Engine instances and I want to open port 9090 in both the instances. I think we need to add some firewall rules.
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Is there a decorator to simply cache function return values?
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Starting from Python 3.2 there is a built-in decorator:
@functools.lru_cache(maxsize=100, typed=False)
Decorator to wrap a function with a memoizing callable that saves up to the maxsize most recent calls. It can save time when an expensive or I/O bound func...
Truncating floats in Python
I want to remove digits from a float to have a fixed number of digits after the dot, like:
29 Answers
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Is there a timeout for idle PostgreSQL connections?
I see a lot of them. We are trying to fix our connection leak. But meanwhile, we want to set a timeout for these idle connections, maybe max to 5 minute.
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What is the purpose of willSet and didSet in Swift?
...nt seems to be that sometimes, you need a property that has automatic storage and some behavior, for instance to notify other objects that the property just changed. When all you have is get/set, you need another field to hold the value. With willSet and didSet, you can take action when the value is...
Requirejs domReady plugin vs Jquery $(document).ready()?
...ize something on DOM ready. Now, RequireJS provides the domReady plugin , but we already have jQuery's $(document).ready() , which is available to me since I have required jQuery.
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Create new tmux session from inside a tmux session
I'm writing a shell script that creates / attaches or switches to a given session, depending on whether one is inside tmux and the session exists.
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How can I list ALL DNS records?
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When you query for ANY you will get a list of all records at that level but not below.
# try this
dig google.com any
This may return A records, TXT records, NS records, MX records, etc if the domain name is exactly "google.com". However, it will not retu...