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How do you read from stdin?
...eed to read from sys.stdin, for example, if you pipe data to stdin:
$ echo foo | python -c "import sys; print(sys.stdin.read())"
foo
We can see that sys.stdin is in default text mode:
>>> import sys
>>> sys.stdin
<_io.TextIOWrapper name='<stdin>' mode='r' encoding='UTF-8'...
Escape a string for a sed replace pattern
...ed allow you to use any character, so long as it fits the pattern: $ echo 'foo/bar' | sed s_/_:_ # foo:bar
– PeterJCLaw
Jun 18 '11 at 13:27
2
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Elegant way to combine multiple collections of elements?
...s, each containing objects of the same type (for example, List<int> foo and List<int> bar ). If these collections were themselves in a collection (e.g., of type List<List<int>> , I could use SelectMany to combine them all into one collection.
...
Referring to the null object in Python
...ay to check things for "Noneness" is to use the identity operator, is:
if foo is None:
...
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In Bash, how do I add a string after each line in a file?
...
Pure POSIX shell and sponge:
suffix=foobar
while read l ; do printf '%s\n' "$l" "${suffix}" ; done < file |
sponge file
xargs and printf:
suffix=foobar
xargs -L 1 printf "%s${suffix}\n" < file | sponge file
Using join:
suffix=foobar
join file file -e...
Using Python String Formatting with Lists
...le token in brackets has no meaning in Python. You usually put brackets in foo = (bar, ) to make it easier to read but foo = bar, does exactly the same thing.
– patrys
Sep 27 '11 at 12:10
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Using Default Arguments in a Function
...the function declaration as follows so you can do what you want:
function foo($blah, $x = null, $y = null) {
if (null === $x) {
$x = "some value";
}
if (null === $y) {
$y = "some other value";
}
code here!
}
This way, you can make a call like foo('blah', nul...
How to use '-prune' option of 'find' in sh?
...o prune out).
Here's an example:
find . -name .snapshot -prune -o -name '*.foo' -print
This will find the "*.foo" files that aren't under ".snapshot" directories. In this example, -name .snapshot makes up the [conditions to prune], and -name '*.foo' -print is [your usual conditions] and [actions to...
How do I unset an element in an array in javascript?
How do I remove the key 'bar' from an array foo so that 'bar' won't show up in
6 Answers
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Accessing items in an collections.OrderedDict by index
...ort collections
>>> d = collections.OrderedDict()
>>> d['foo'] = 'python'
>>> d['bar'] = 'spam'
>>> d.items()
[('foo', 'python'), ('bar', 'spam')]
>>> d.items()[0]
('foo', 'python')
>>> d.items()[1]
('bar', 'spam')
Note for Python 3.X
dict.ite...