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How to delete the contents of a folder?
... removals will be ignored; if false or omitted, such errors are handled by calling a handler specified by onerror or, if that is omitted, they raise an exception.
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How to iterate over rows in a DataFrame in Pandas
...hing: List Comprehensions*
List comprehensions should be your next port of call if 1) there is no vectorized solution available, 2) performance is important, but not important enough to go through the hassle of cythonizing your code, and 3) you're trying to perform elementwise transformation on your...
Java 8 stream's .min() and .max(): why does this compile?
...s. The idea is that any interface with one abstract method can be automatically implemented by any lambda - or method reference - whose method signature is a match for the one method on the interface. So examining the Comparator interface (simple version):
public Comparator<T> {
T compa...
Add text to Existing PDF using Python
...PyPDF so I thought I'd share:
read your PDF using PdfFileReader(), we'll call this input
create a new pdf containing your text to add using ReportLab, save this as a string object
read the string object using PdfFileReader(), we'll call this text
create a new PDF object using PdfFileWriter(), we'l...
What's the difference between including files with JSP include directive, JSP include action and usi
... beginnings and ends of pages.
You can implicitly include preludes (also called headers) and codas
(also called footers) for a group of JSP pages by adding
<include-prelude> and <include-coda> elements respectively within
a <jsp-property-group> element in the Web applicatio...
Getter and Setter declaration in .NET [duplicate]
...urning a field into a property:
string MyProperty { get; set; }
This is called an auto-implemented property. When the need arises you can expand your property to:
string _myProperty;
public string MyProperty
{
get { return _myProperty; }
set { _myProperty = value; }
}
Now you can add ...
SQL, Postgres OIDs, What are they and why are they useful?
...
OIDs basically give you a built-in id for every row, contained in a system column (as opposed to a user-space column). That's handy for tables where you don't have a primary key, have duplicate rows, etc. For example, if you...
Is Fortran easier to optimize than C for heavy calculations?
...safer and easier to write. For example, consider the invalid Fortran code: CALL TRANSFORM(A(1, 30), A(2, 31), A(3, 32), 30), which most Fortran compilers will happily compile without any warning but introduces a bug that only shows up on some compilers, on some hardware and with some optimization op...
Version vs build in Xcode
...'re asking about the Version/Build difference, so I'll answer it philosophically.
There are all sorts of schemes, but a popular one is:
{MajorVersion}.{MinorVersion}.{Revision}
Major version - Major changes, redesigns, and functionality
changes
Minor version - Minor improvements, additions to fu...
Testing modules in rspec
...son you didn't include Say inside of the DummyClass declaration instead of calling extend?
– Grant Birchmeier
Aug 31 '12 at 17:50
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