sudo pip install pythonpy && alias py='pythonpy'

For a permanent alias (For Bash users):

echo "alias py='pythonpy'" >> ~/.bashrc

$ py '3 * 1.5'
4.5

$ py '7**3'
343

$ py 'range(3)'
0
1
2

$ py '[x**2 for x in range(1,5)]'
1
4
9
16

$ py 'math.exp(1)'
2.71828182846

$ py 'random.random()'
0.103173957713

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

$ py 'range(3)' | py -x 'x + ".txt"'
0.txt
1.txt
2.txt

$ py 'range(4)' | py -l 'sorted(l, reverse=True)'
3
2
1
0

$ py 'range(4)' | py -l 'sum(int(x) for x in l)'
6

$ py 'range(17)' | py -l 'len(l)'
17

$ py 'range(8)' | py -x 'x if int(x)%2 == 0 else None'
0
2
4
6

$ py 'range(8)' | py -fx 'int(x)%2 == 1'
1
3
5
7

$ cat /usr/share/dict/words | py -fx 're.match(r"and", x)' | head -5
and
andante
andante's
andantes
andiron

$ cat /usr/share/dict/words | py -fx 're.match(r"ba.*ing$", x)' | head -5
baaing
babbling
babying
babysitting
backbiting

$ cat /usr/share/dict/words | py -fx 'x==x[::-1] and len(x) >= 5' | head -5
civic
deified
kayak
level
ma'am

$ ifconfig | py -x --i 're.search(r"192\.168[\d\.]+", x).group()'
192.168.1.41