[i * i for i in l if i % 2 == 0]

map(lambda x : x * x, filter(lambda x : x % 2 == 0, l))

x for x in foo if x

def map(f, s):
    return [f(x) for x in s]
def filter(f, s):
    return [x for x in s if f(s)]

import textwrap
para = "\n\n"

print para.join(textwrap.fill(elem, 40)
                      for elem in msg.split(para))

def wrap(text, width):
    """
    A word-wrap function that preserves existing line breaks
    and most spaces in the text. Expects that existing line
    breaks are linux style newlines (\n).
    """
    def func(line, word):
        nextword = word.split("\n", 1)[0]
        n = len(line) - line.rfind('\n') - 1 + len(nextword)
        if n >= width:
            sep = "\n"
        else:
            sep = " "
        return '%s%s%s' % (line, sep, word)
    text = text.split(" ")
    while len(text) > 1:
        text[0] = func(text.pop(0), text[0])
    return text[0]
print wrap(msg, 40)

anon = foo(x, y*z) with x, y, z
anon(a, b, c)

z = 4
curried_anon = foo(x, y*z) with x, y

x = [(3,2), (2,4), (1,1)]
for elem in sorted(x, key=elem[1] with elem):
    ...

myobj.callback(button.click() with None)