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Combine two data frames by rows (rbind) when they have different sets of columns
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13 Answers
13
Active
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Check if a string contains a substring in SQL Server 2005, using a stored procedure
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401
CHARINDEX() searches for a substring within a larger string, and returns the position of the mat...
What are all the uses of an underscore in Scala?
...K[_],T](a: K[T])
Ignored variables
val _ = 5
Ignored parameters
List(1, 2, 3) foreach { _ => println("Hi") }
Ignored names of self types
trait MySeq { _: Seq[_] => }
Wildcard patterns
Some(5) match { case Some(_) => println("Yes") }
Wildcard patterns in interpolations
"abc" m...
How to send POST request?
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>>> r = requests.post("http://bugs.python.org", data={'number': 12524, 'type': 'issue', 'action': 'show'})
>>> print(r.status_code, r.reason)
200 OK
>>> print(r.text[:300] + '...')
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/x...
Python try…except comma vs 'as' in except
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The definitive document is PEP-3110: Catching Exceptions
Summary:
In Python 3.x, using as is required to assign an exception to a variable.
In Python 2.6+, use the as syntax, since it is far less ambiguous and forward compatible with Python 3.x.
In Pytho...
Linux find file names with given string
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195
Use the find command,
find . -type f -name "*John*"
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UPDATE multiple tables in MySQL using LEFT JOIN
I have two tables, and want to update fields in T1 for all rows in a LEFT JOIN.
5 Answers
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Suppress command line output
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212
Because error messages often go to stderr not stdout.
Change the invocation to this:
taskkill...
Getting pids from ps -ef |grep keyword
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edited Nov 14 '11 at 10:59
answered Nov 14 '11 at 10:41
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What is IP address '::1'?
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152
::1 is the loopback address in IPv6. Think of it as the IPv6 version of 127.0.0.1.
See http:...