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Iterator invalidation rules
... the iterators and references before the insertion point remain valid. [26.3.11.5/1]
With respect to the reserve function, reallocation invalidates all the references, pointers, and iterators referring to the elements in the sequence. No reallocation shall take place during insertions that happen af...
Finding the mode of a list
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vinzee
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answered Jan 24 '15 at 20:08
David DaoDavid Dao
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What's the u prefix in a Python string?
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You're right, see 3.1.3. Unicode Strings.
It's been the syntax since Python 2.0.
Python 3 made them redundant, as the default string type is Unicode. Versions 3.0 through 3.2 removed them, but they were re-added in 3.3+ for compatibility wi...
How to slice an array in Bash
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See the Parameter Expansion section in the Bash man page. A[@] returns the contents of the arr...
Ruby - elegantly convert variable to an array if not an array already
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153
[*foo] or Array(foo) will work most of the time, but for some cases like a hash, it messes it up...
When is “i += x” different from “i = i + x” in Python?
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3 Answers
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What does -1 mean in numpy reshape?
...numpy allow us to give one of new shape parameter as -1 (eg: (2,-1) or (-1,3) but not (-1, -1)). It simply means that it is an unknown dimension and we want numpy to figure it out. And numpy will figure this by looking at the 'length of the array and remaining dimensions' and making sure it satisfi...
NULL values inside NOT IN clause
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Query A is the same as:
select 'true' where 3 = 1 or 3 = 2 or 3 = 3 or 3 = null
Since 3 = 3 is true, you get a result.
Query B is the same as:
select 'true' where 3 <> 1 and 3 <> 2 and 3 <> null
When ansi_nulls is on, 3 <> null is UNKNOWN,...
Insert a line at specific line number with sed or awk
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sed -i '8i8 This is Line 8' FILE
inserts at line 8
8 This is Line 8
into file FILE
-i doe...
Python Remove last 3 characters of a string
I'm trying to remove the last 3 characters from a string in python, I don't know what these characters are so I can't use rstrip , I also need to remove any white space and convert to upper-case
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