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Installation
------------
::
pip install pythonpy
::
Usage
-----------------------------------------------
Pythonpy will evaluate any python expression from the command line.
Float Arithmetic
~~~~~~~~~~~~~~~~
::
$ py '3 * 1.5'
4.5
::
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.
::
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
::
Grab the second column of a csv
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
::
$ echo $'a1,b1,c1\na2,b2,c2' | py -x 'x.split(",")[1]'
b1
b2
::
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
::
Remove every file returned by the find command
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
::
$ find . -type f | py -x '"rm %s" % x' | sh
::
Get only 2 digit numbers
~~~~~~~~~~~~~~~~~~~~~
::
$ py 'range(14)' | py -x 'x if len(x) == 2 else None'
10
11
12
13
::
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]
::
Reverse the input
~~~~~~~~~~~~~~~~~
::
$ py 'range(3)' | py -l 'l[::-1]'
2
1
0
::
Sum the input
~~~~~~~~~~~~~
::
$ py 'range(3)' | py -l 'sum(int(x) for x in l)'
3
::
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
::
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)
::
For more examples, check out the `wiki <http://github.com/Russell91/pythonpy/wiki>`__.
Pythonpy also supports ipython style tab completion, which you can enable as follows
::
$ if command -v find_pycompletion.sh>/dev/null; then source `find_pycompletion.sh`; fi
::
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