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const lines = [
  'I am a string',
  'I am not a string',
  'Lies',
  'You got me',
];

function printLines(callback: () => void) {
  lines.forEach((line, i) => console.log(`Line ${i}: ${line}`));
  callback();

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def __iter__(self):
    for attr, value in self.__dict__.iteritems():
        yield (attr, value)

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One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

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groups = dict(list(gb))

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   c1   c2
0   3   10
4   2  100
1   2   30
3   2   15
2   1   20

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from xml.dom.minidom import parse, parseString
import urllib2
# note - i convert it back into xml to pretty print it
print parse(urllib2.urlopen("http://search.twitter.com/search.atom?&q=python")).toprettyxml(encoding="utf-8")

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df['x'].str.lower()

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du -hs /path/to/directory

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npm ls

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df[df['A'].isin([3, 6])]