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pandas: How do I split text in a column into multiple rows?
...= pd.DataFrame(['a b c']*100000, columns=['col']);
print pd.DataFrame(dict(zip(range(3), [df['col'].apply(lambda x : x.split(' ')[i]) for i in range(3)]))).head()"
The second simply refrains from allocating 100 000 Series, and this is enough to make it around 10 times faster. But the third solutio...
What is the difference between Class Path and Build Path
...In CLASSPATH environment you need to specify only .class files (i.e., jar, zip files – Inside jar, zip files you will find only java classes) i.e. you are helping Java Virtual Machine (JVM) to find Java class files
Also what should i do to create a file
under the src folder of a Spring MVC
...
Common MySQL fields and their appropriate data types
... |
| US zip code | CHAR(5) | Use CHAR(10) if you store extended
codes
| US/Canada p.code | CHAR(6) | ...
py2exe - generate single executable file
...le you will want to set bundle_files to 1, compressed to True, and set the zipfile option to None. That way it creates one compressed file for easy distribution.
Here is a more complete description of the bundle_file option quoted directly from the py2exe site*
Using "bundle_files" and "zipfile...
How do I undo 'git add' before commit?
...iles of the given extension you want to unadd. For me it was *.bmp & *.zip
– boulder_ruby
Nov 26 '13 at 14:25
22
...
What is a “context bound” in Scala?
...xt method:
def **[T : Numeric](xs: Iterable[T], ys: Iterable[T]) =
xs zip ys map { t => implicitly[Numeric[T]].times(t._1, t._2) }
or
def **[T : Numeric](xs: Iterable[T], ys: Iterable[T]) =
xs zip ys map { t => context[T]().times(t._1, t._2) }
...
File input 'accept' attribute - is it useful?
...ector dxr
application/x-dvi dvi
application/x-gtar gtar
application/x-gzip gz
application/x-hdf hdf
application/x-internet-signup ins
application/x-internet-signup isp
application/x-iphone iii
application/x-javascript js
application/x-latex latex
application/x-msaccess mdb
applicat...
Should composer.lock be committed to version control?
...es reacquired in each environment, especially prod. Your deliverable (tar, zip, phar, a directory, etc) should be immutable and promoted through environments without changing.
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improve this a...
When to use symbols instead of strings in Ruby?
...ound at codecademy:
require 'benchmark'
string_AZ = Hash[("a".."z").to_a.zip((1..26).to_a)]
symbol_AZ = Hash[(:a..:z).to_a.zip((1..26).to_a)]
string_time = Benchmark.realtime do
1000_000.times { string_AZ["r"] }
end
symbol_time = Benchmark.realtime do
1000_000.times { symbol_AZ[:r] }
end
pu...
What is the difference between Ruby 1.8 and Ruby 1.9
...rray of Symbols
Ruby 1.9
irb(main):001:0> {}.methods.sort.last
=> :zip
Ruby 1.8.6
irb(main):001:0> {}.methods.sort.last
=> "zip"
Action: Replace instance_methods.include? with method_defined?
Source File Encoding
Basic
# coding: utf-8
Emacs
# -*- encoding: utf-8 -*-
Sheb...