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Different types of thread-safe Sets in Java
...want to be sure all changes are immediately visible to the other threads.
3) ConcurrentSkipListSet is the concurrent SortedSet implementation, with most basic operations in O(log n). It allows concurrent adding/removing and reading/iteration, where iteration may or may not tell about changes since ...
Insert a row to pandas dataframe
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Just assign row to a particular index, using loc:
df.loc[-1] = [2, 3, 4] # adding a row
df.index = df.index + 1 # shifting index
df = df.sort_index() # sorting by index
And you get, as desired:
A B C
0 2 3 4
1 5 6 7
2 7 8 9
See in Pandas documentation Indexing: Setti...
How to create nonexistent subdirectories recursively using Bash?
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437
You can use the -p parameter, which is documented as:
-p, --parents
no error if existing, make...
C# equivalent to Java's charAt()?
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Steven V
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answered Aug 27 '10 at 6:10
ZachZach
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Change File Extension Using C#
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edited Mar 10 '11 at 13:12
answered Mar 10 '11 at 13:03
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Ruby class types and case statements
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235
You must use:
case item
when MyClass
...
I had the same problem:
How to catch Errno::ECONNRE...
What is the difference between README and README.md in GitHub projects?
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385
.md is markdown. README.md is used to generate the html summary you see at the bottom of proj...
How to delete duplicates on a MySQL table?
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answered Apr 13 '10 at 14:52
user187291user187291
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CSS Input Type Selectors - Possible to have an “or” or “not” syntax?
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183
CSS3 has a pseudo-class called :not()
input:not([type='checkbox']) {
visibility: h...
How to get correct timestamp in C#
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ekadekad
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