dot-sean / pythonpy

the swiss army knife of the command line

Installation

sudo pip install pythonpy

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Usage

Pythonpy will evaluate any python expression from the command line.

Float Arithmetic

$ py '3 * 1.5' 
4.5

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Import any module automatically ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ 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.

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py -x 'foo(x)' will apply foo to each line of input

Multiply each line of input by 7

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

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Grab the second column of a csv ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

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Append ".txt" to every file in the directory

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

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Remove every file returned by the find command ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

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Get only 2 digit numbers ~~~~~~~~~~~~~~~~~~~~~

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

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py -l will set l = list(sys.stdin)

Lists are printed row by row

$ py 'range(3)'
0
1
2

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

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Reverse the input

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

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Sum the input

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

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Sort a csv by the second column

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

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Count words beginning with each letter

$ 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)

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For more examples, check out the wiki