大约有 32,293 项符合查询结果（耗时：0.0359秒） [XML]
Check if passed argument is file or directory in Bash
...k. I am not sure why it's failing. You're quoting your variables properly. What happens if you use this script with double [[ ]]?
if [[ -d $PASSED ]]; then
echo "$PASSED is a directory"
elif [[ -f $PASSED ]]; then
echo "$PASSED is a file"
else
echo "$PASSED is not valid"
exit 1
fi
...
What is the best way to clone/deep copy a .NET generic Dictionary?
...
@SaeedGanji: That depends on what else is going on. If other threads are only reading from the original dictionary, then I believe it should be fine. If anything is modifying it, you'll need to lock in both that thread and the cloning thread, to avoid th...
What is the “right” way to iterate through an array in Ruby?
... falls out extremely neatly and concisely.
As for the original question, "What is the “right” way to iterate through an array in Ruby?", well, I think the core way (i.e. without powerful syntactic sugar or object oriented power) is to do:
for index in 0 ... array.size
puts "array[#{index}] =...
Check if object is file-like in Python
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why what about operators like __add__, __lshift__ or __or__ in custom classes? (file object and API: docs.python.org/glossary.html#term-file-object )
– n611x007
Sep 8 '12 at 12:56
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What is the difference between Strategy design pattern and State design pattern?
What are the differences between the Strategy design pattern and the State design pattern? I was going through quite a few articles on the web but could not make out the difference clearly.
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How do I add more members to my ENUM-type column in MySQL?
...-----------------------------------------------+
1 row in set (0.00 sec)
What error are you seeing?
FWIW this would also work:
ALTER TABLE carmake MODIFY COLUMN country ENUM('Sweden','Malaysia');
I would actually recommend a country table rather than enum column. You may have hundreds of countr...
warning this call is not awaited, execution of the current method continues
...GetNameAsync()
{
...
}
Consider to see answer to a related question:
What's the difference between returning void and returning a Task?
Update
If you need the result, you can change the GetNameAsync to return, say, Task<string>:
public static async Task<string> GetNameAsync()
{
...
“Remote System Explorer Operation” causing freeze for couple of seconds
... now 2016, this should be the newly accepted answer. However, I do wonder what removing that from the build will break?!
– HDave
May 19 '16 at 15:18
1
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What is the difference between “def” and “val” to define a function
What is the difference between:
8 Answers
8
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How to make good reproducible pandas examples
...ly to above)
In [3]: iwantthis
Out[3]:
A B
0 1 5
1 4 6
Explain what the numbers come from: the 5 is sum of the B column for the rows where A is 1.
do show the code you've tried:
In [4]: df.groupby('A').sum()
Out[4]:
B
A
1 5
4 6
But say what's incorrect: the A column is in the...