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How to get first character of a string in SQL?
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LEFT(colName, 1) will also do this, also. It's equivalent to SUBSTRING(colName, 1, 1).
I like LEFT, since I find it a bit cleaner, but really, there's no difference either way.
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Rotating a two-dimensional array in Python
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Consider the following two-dimensional list:
original = [[1, 2],
[3, 4]]
Lets break it down step by step:
>>> original[::-1] # elements of original are reversed
[[3, 4], [1, 2]]
This list is passed into zip() using argument unpacking, so the zip call ends...
How do I use floating-point division in bash?
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18 Answers
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Convert a row of a data frame to vector
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When you extract a single row from a data frame you get a one-row data frame. Convert it to a...
Differences between Oracle JDK and OpenJDK
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11 Answers
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Decreasing for loops in Python impossible?
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for n in range(6,0,-1):
print n
# prints [6, 5, 4, 3, 2, 1]
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How to profile a bash shell script slow startup?
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132
If you have GNU date (or another version that can output nanoseconds), do this at the beginnin...
Current time formatting with Javascript
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14 Answers
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Understanding dict.copy() - shallow or deep?
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1010
By "shallow copying" it means the content of the dictionary is not copied by value, but just ...