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Apache Spark: map vs mapPartitions?
..."), 3)
val b = a.map(_.length)
val c = a.zip(b)
c.collect
res0: Array[(String, Int)] = Array((dog,3), (salmon,6), (salmon,6), (rat,3), (elephant,8))
mapPartitions
This is a specialized map that is called only once for each partition.
The entire content of the respective partitions is av...
Python matplotlib multiple bars
How to plot multiple bars in matplotlib, when I tried to call the bar function multiple times, they overlap and as seen the below figure the highest value red can be seen only.
How can I plot the multiple bars with dates on the x-axes?
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Trying to mock datetime.date.today(), but not working
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There are a few problems.
First of all, the way you're using mock.patch isn't quite right. When used as a decorator, it replaces the given function/class (in this case, datetime.date.today) with a Mock object only within the decorated function. So, only within...
Find the files existing in one directory but not in the other [closed]
...rison is to use find with md5sum, then a diff.
Example:
Use find to list all the files in the directory then calculate the md5 hash for each file and pipe it to a file:
find /dir1/ -type f -exec md5sum {} \; > dir1.txt
Do the same procedure to the another directory:
find /dir2/ -type f -exe...
How to start an application without waiting in a batch file?
...g should work, it's very likely you're leaving out some quotes (or putting extras in).
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how to write setTimeout with params by Coffeescript
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delay 1000, -> something param
Granted, this adds the overhead of an extra function call to every setTimeout you make; but in today's JS interpreters, the performance drawback is insignificant unless you're doing it thousands of times per second. (And what are you doing setting thousands of ti...
Avoid browser popup blockers
...m javascript that is not invoked by direct user action. That is, you can call window.open in response to a button click without getting hit by the popup blocker, but if you put the same code in a timer event it will be blocked. Depth of call chain is also a factor - some older browsers only look a...
Python None comparison: should I use “is” or ==?
...ject None, so when you do my_var is None, you're checking whether they actually are the same object (not just equivalent objects)
In other words, == is a check for equivalence (which is defined from object to object) whereas is checks for object identity:
lst = [1,2,3]
lst == lst[:] # This is Tr...
How to concatenate two MP4 files using FFmpeg?
...pe f is for only listing files. I added | sort to sort the files alphabetically; because find reads them in order as saved on filesystem. Works also for files with whitespaces.
– erik
Dec 2 '16 at 14:15
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Git cherry pick vs rebase
... the distinction indeed became somewhat moot, but this is something to be called convergent evolution ;-)
The true distinction lies in original intent to create both tools:
git rebase's task is to forward-port a series of changes a developer has in their private repository, created against versio...