sesameoil / opy

awk or rb like Python wrapper

opy: onelinerers' Python

a Python wrapper that works like AWK or rb command

usage

pattern/action/list action

• pattern

$ seq 10 | opy 'F1%2==0'
2
4
6
8
10

• action

$ seq 10 | opy '{print(F1,end="")}' 
12345678910

• list action

$ echo 1 2 3 a b c | opy '[ F2, F3*3, F5+"aaa"]'
2 9 baaa

• pattern and action

$ seq 10 | opy 'F1%2==0:{F1= str(F1)+" " ; print(F1,end="")}' 
2 4 6 8 10 

• pattern and list action

$ seq 10 | opy 'F1%2==0:[F1, ": even"]'
2 : even
4 : even
6 : even
8 : even
10 : even

• muitliple rules:

$ seq 4 | opy 'F1%2==0:[F1, ":even"];F1%2==1:[F1, ": odd"]'
1 : odd
2 : even
3 : odd
4 : even

• BEGIN and END patterns

$ seq 10 | opy 'B:{a=0};{a+=F1};E:[a]'
55

or

$ seq 10 | opy 'BEGIN:{a=0};{a+=F1};END:[a]'
55

• list at begin

$ opy 'B:[1+1]'
2

import of modules

$ seq 1 3 | opy -m 'import math' '[ F1*math.pi, math.sin(F1) ]' 
3.141592653589793 0.8414709848078965
6.283185307179586 0.9092974268256817
9.42477796076938 0.1411200080598672

dynamic load of modules

$ seq 1 3 | opy '[ F1*math.pi, math.sin(F1) ]' 
3.141592653589793 0.8414709848078965
6.283185307179586 0.9092974268256817
9.42477796076938 0.1411200080598672

• note: It works only in list actions. Each element must not be changed in the list.

list comprehension

$ seq 1 100 | xargs -n 10 | opy '[ 1.0/x for x in F[1:3] ]'
1.0 0.5
0.09090909090909091 0.08333333333333333
0.047619047619047616 0.045454545454545456
0.03225806451612903 0.03125
0.024390243902439025 0.023809523809523808
0.0196078431372549 0.019230769230769232
0.01639344262295082 0.016129032258064516
0.014084507042253521 0.013888888888888888
0.012345679012345678 0.012195121951219513
0.01098901098901099 0.010869565217391304

original function

• regular expression match (wrapper of re.search)

$ seq 10 | opy 'r_("[24680]")'
2
4
6
8
10

or

$ seq 10 | opy 'r_("[24680]", F1)'
2
4
6
8
10

• field concatenate

$ echo {1..10} | $com '[Fs(2,4)]'
2 3 4

input from file

$ opy 'NR==1' $(which opy)
#!/usr/bin/env python3

options

• --help: show help
• -m <import sentences>: load modules
• -s: string mode
  • prohibit automatic number conversions.
• -i, -o: input/output field separator

$ echo '1,2,3,4,5' | opy -i , '[F2]'
2
$ echo '1,2,3,4,5' | opy -i , -o x '[Fs(2,4)]'
2x3x4

• -I: regex input field separator

$ echo a33b313c | tr ' ' , | opy -I '\d+' '[Fs(1,3)]'
a b c