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Apache Spark: map vs mapPartitions?
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122
What's the difference between an RDD's map and mapPartitions method?
The method map conver...
Python Dictionary to URL Parameters
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256
Use urllib.urlencode(). It takes a dictionary of key-value pairs, and converts it into a form ...
C# equivalent to Java's charAt()?
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201
You can index into a string in C# like an array, and you get the character at that index.
Exa...
How do I check the difference, in seconds, between two dates?
...ates, use total_seconds like this:
import datetime as dt
a = dt.datetime(2013,12,30,23,59,59)
b = dt.datetime(2013,12,31,23,59,59)
(b-a).total_seconds()
86400.0
#note that seconds doesn't give you what you want:
(b-a).seconds
0
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What's the difference between --general-numeric-sort and --numeric-sort options in gnu sort
... sort compares the numbers as floats, this allows scientific notation eg 1.234E10 but is slower and subject to rounding error (1.2345678 could come after 1.2345679), numeric sort is just a regular alphabetic sort that knows 10 comes after 9.
See http://www.gnu.org/software/coreutils/manual/htm...
Reverse Range in Swift
...sed() method on a range
for i in (1...5).reversed() { print(i) } // 5 4 3 2 1
Or stride(from:through:by:) method
for i in stride(from:5,through:1,by:-1) { print(i) } // 5 4 3 2 1
stide(from:to:by:) is similar but excludes the last value
for i in stride(from:5,to:0,by:-1) { print(i) } // 5 4 3...
How to get the last N rows of a pandas DataFrame?
I have pandas dataframe df1 and df2 (df1 is vanila dataframe, df2 is indexed by 'STK_ID' & 'RPT_Date') :
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What is non-blocking or asynchronous I/O in Node.js?
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How to use a variable for the key part of a map
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Python using enumerate inside list comprehension
... the result that gets returned is as expected:
> [(0, 'a'), (1, 'b'), (2, 'c'), (3, 'd')]
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