Assessment: Command-Line Programs

readings.py

import sys
import numpy

def main():
     script=sys.argv[0]
     action=sys.argv[1]
     filenames=sys.argv[2:]

    assert action in ['--min", '--mean','--max'],\
        Action is not one of --min, --mean, or --max: ' + action
    if len(filenames)==0
        process(sys.stdin,action)
    else:
        for f in filenames:
             process(f,action)

def process(filename, action):
    data=np.loadtxt(filename, delimiter=',')

    if action == 'min':
        values=data.min(axis=1)
    elif action == 'mean':
        values=data.mean(axis=1)
    elif action == 'max':
        values=data.max(axis=1)

    for m in values:
        print m
        
main()