大约有 42,000 项符合查询结果（耗时：0.0355秒） [XML]
How do I check if a string is unicode or ascii?
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301
In Python 3, all strings are sequences of Unicode characters. There is a bytes type that holds...
How to run multiple Python versions on Windows
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136
Running a different copy of Python is as easy as starting the correct executable. You mention t...
Using async/await for multiple tasks
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int[] ids = new[] { 1, 2, 3, 4, 5 };
Parallel.ForEach(ids, i => DoSomething(1, i, blogClient).Wait());
Although you run the operations in parallel with the above code, this code blocks each thread that each operation runs on. For example, if the ...
How to insert newline in string literal?
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323
Well, simple options are:
string.Format:
string x = string.Format("first line{0}second line...
NPM - How to fix “No readme data”
...o, when you read that warning, ensure that the problem is not related to a 3rd party package.
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Uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)
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137
This is an incompatibility between Rails 2.3.8 and recent versions of RubyGems. Upgrade to the ...
Pandas dataframe get first row of each group
...;> df.groupby('id').first()
value
id
1 first
2 first
3 first
4 second
5 first
6 first
7 fourth
If you need id as column:
>>> df.groupby('id').first().reset_index()
id value
0 1 first
1 2 first
2 3 first
3 4 second
4 5 first
5 6...
What is the smallest possible valid PDF?
...lt;/Type/Catalog/Pages 2 0 R>>endobj 2 0 obj<</Type/Pages/Kids[3 0 R]/Count 1>>endobj 3 0 obj<</Type/Page/MediaBox[0 0 3 3]>>endobj
xref
0 4
0000000000 65535 f
0000000010 00000 n
0000000053 00000 n
0000000102 00000 n
trailer<</Size 4/Root 1 0 R>>
startxref
1...
Python, compute list difference
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373
If the order does not matter, you can simply calculate the set difference:
>>> set([...