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Using comparison operators in Scala's pattern matching system
...and a boolean expression after the pattern:
a match {
case 10 => println("ten")
case x if x > 10 => println("greater than ten")
case _ => println("less than ten")
}
Edit: Note that this is more than superficially different to putting an if after the =>, because a patter...
How to convert array to SimpleXML
How can I convert an array to a SimpleXML object in PHP?
33 Answers
33
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What is cardinality in MySQL?
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Some columns are called high-cardinality columns because they have constraints in place (like unique) prohibiting you from putting the same value in every row.
Cardinality is a property which affects the ability to cluster, sort and search data. It is therefore an important measurement for the qu...
Convert JSON to Map
What is the best way to convert a JSON code as this:
17 Answers
17
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Using print statements only to debug
...le log methods, debug, info, warning, error and critical.
import logging, sys
logging.basicConfig(stream=sys.stderr, level=logging.DEBUG)
logging.debug('A debug message!')
logging.info('We processed %d records', len(processed_records))
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Show the progress of a Python multiprocessing pool imap_unordered call?
...vate attributes of the result set:
from __future__ import division
import sys
for i, _ in enumerate(p.imap_unordered(do_work, xrange(num_tasks)), 1):
sys.stderr.write('\rdone {0:%}'.format(i/num_tasks))
share
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Generate random int value from 3 to 6
... maximum value, it can be generated.
SELECT @MIN+FLOOR((@MAX-@MIN+1)*RAND(CONVERT(VARBINARY,NEWID()))); --And then this T-SQL snippet generates an integer between minimum and maximum integer values.
You can change and edit this code for your needs.
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Strings in a DataFrame, but dtype is object
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Why do i need to convert every column i pass into scipy or sklearn astype(str) for it to accept it? seems I should be able to apply that to all columns initially.
– Tinkinc
Aug 21 '19 at 12:53
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Write bytes to file
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The simplest way would be to convert your hexadecimal string to a byte array and use the File.WriteAllBytes method.
Using the StringToByteArray() method from this question, you'd do something like this:
string hexString = "0CFE9E69271557822FE715A8B3E56...
How to convert a string or integer to binary in Ruby?
...ger#to_s(base) and String#to_i(base) available to you.
Integer#to_s(base) converts a decimal number to a string representing the number in the base specified:
9.to_s(2) #=> "1001"
while the reverse is obtained with String#to_i(base):
"1001".to_i(2) #=> 9
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