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Community Notice: We'll working on a new release of pythonpy2 that will break backwards compatibility. Check out the thread here if you want to be involved: https://github.com/Russell91/pythonpy/issues/86.

pip install pythonpy

Bonus: tab completion setup is explained at the end of the readme

Pythonpy will evaluate any python expression from the command line.

$ py '3 * 1.5'
4.5

$ py 'math.exp(1)'
2.71828182846

$ py 'random.random()'
0.103173957713

$ py 'datetime.datetime.now?'
Help on built-in function now:

now(...)
      [tz] -> new datetime with tz's local day and time.

$ py 'range(3)' | py -x 'int(x)*7'
0
7
14

$ echo $'a1,b1,c1\na2,b2,c2' | py -x 'x.split(",")[1]'
b1
b2

$ ls | py -x '"mv `%s` `%s.txt`" % (x,x)' | sh
# sharp quotes are swapped out for single quotes
# single quotes handle spaces in filenames

$ find . -type f | py -x '"rm %s" % x' | sh

$ py 'range(14)' | py -x 'x if len(x) == 2 else None'
10
11
12
13

$ py 'range(3)'
0
1
2

$ py '[range(3)]'
[0, 1, 2]

$ py 'range(3)' | py -l 'l[::-1]'
2
1
0

$ py 'range(3)' | py -l 'sum(int(x) for x in l)'
3

$ echo $'a,2\nb,1' | py -l 'sorted(l, key=lambda x: x.split(",")[1])'
b,1
a,2

$ cat /usr/share/dict/words | py -x 'x[0].lower()' | py -l 'collections.Counter(l).most_common(5)'
('s', 11327)
('c', 9521)
('p', 7659)
('b', 6068)
('m', 5922)

For more examples, check out the wiki.

Pythonpy also supports ipython style tab completion, which you can enable by adding the following to your .bashrc

$ if command -v find_pycompletion.sh>/dev/null; then source `find_pycompletion.sh`; fi

The tab completion has a few quirks, all of which are necessary evils. If you find any regressions in behaviour, please report them though.