大约有 30,000 项符合查询结果（耗时：0.0403秒） [XML]
Counting occurrences in Vim without marking the buffer changed
In order to know how many times a pattern exists in current buffer, I do:
6 Answers
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Finding the average of a list
...d have assumed this would be much more efficient, but it appears to take 8 times as long on a random list of floats than simply sum(l)/len(l)
– L. Amber O'Hearn
Sep 23 '15 at 19:04
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Copy a stream to avoid “stream has already been operated upon or closed”
...call to Supplier.get(). i.e if a database query... that query is done each time
– Julien
May 4 at 10:13
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How to stop Visual Studio from “always” checking out solution files?
For apparently no reason, every time I open my solution, Visual Studio checks the sln file out.
8 Answers
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Average of 3 long integers
...ker's delight is even more correct but I'll the implementation for another time
– phuclv
May 30 '14 at 16:10
I'm not s...
Compare two DataFrames and output their differences side-by-side
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This implementation is taking a longer time when comparing dataframes with 26K rows and 400 columns. Is there any way to speed it up?
– codeslord
Jul 18 '18 at 5:03
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What is a WeakHashMap and when to use it? [duplicate]
...me obsolete.
Remember that WeakHashMap is useful only if the desired lifetime of cache
entries is determined by external references to the key, not the value.
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What happens when a computer program runs?
...irectly). It is commonly used for data structures that you allocate at runtime (in C++, using new and delete, and malloc and friends in C, etc).
The stack and heap, on the x86 architecture, both physically reside in your system memory (RAM), and are mapped through virtual memory allocation into th...
Swift native base class or NSObject
...objc_msgSend() for calls to (most of) their methods
provide Objective-C runtime metadata for (most of) their method implementations
Swift classes that are not subclasses of NSObject:
are Objective-C classes, but implement only a handful of methods for NSObject compatibility
do not use objc_msgSe...
Read specific columns from a csv file with csv module?
...content
Now that we have covered your mistake, I would like to take this time to introduce you to the pandas module.
Pandas is spectacular for dealing with csv files, and the following code would be all you need to read a csv and save an entire column into a variable:
import pandas as pd
df = pd...