How do I take in Command Line arguments?

[ironmonkey69]

Right now, I have this python script that lets me choose which column of a text file that I can zero out. Them column nubmer is stored as the variable 'elem'. I also was given a sample of taking in command line arguements. I was wondering if anyone could help me intergrate this into the code so that from the command line I can input a number and have the script zero out the column.

beginning text file:
#Number of Bits
12
#Data
0 0 0 0 0 0 0 0 0 0 0 0
12 5 3 4 6 4 5 4 7 5 5 10
24 9 7 7 13 7 9 9 14 10 10 20

text file after script has been run:
#Number of Bits
12
#Data
0 0 0 0 0 0 0 0 0 0 0 0
0 5 3 4 6 4 5 4 7 5 5 10
0 9 7 7 13 7 9 9 14 10 10 20
and this is what it does:

def nthzero(dataList, nth, n):
    '''
    Replace the nth element of each list in the data list with 'n'
    '''
    for item in dataList:
        item[nth] = n
    return dataList
 
fn = '/outfile.txt'
f = open(fn)
 
s = f.readline()
prefix = s
while s.strip() != '#Data':
    s = f.readline()
    prefix += s
    
lineList = [line.strip().split() for line in f.readlines()]
for line in f.readlines():
    lineList.append(line.strip().split())
 
f.close()
elem = 0
repl = '0'
lineList = nthzero(lineList, elem, repl)

fn1 = '/outfile.txt'
f = open(fn1, 'w')
outList = []
for line in lineList:
    outList.append(' '.join(line))
    
f.write('%s%s' % (prefix, '\n'.join(outList)))
f.close()

example of the command line

/usr/bin/python hello.py \"1, 2, 4, 6, 9\""

hello.py
import sys
names = sys.argv[1].split(', ')
list = []
for name in names:
   list.append(name)
print list
#print "Hello " + sys.argv[1]

output:
Hello [1, 2, 4, 6, 9]

[ironmonkey69]

This code is in Python 2.0.

[bartonc]

/usr/bin/python hello.py 1 2 4 6 9

[eric dexter]

I have a couple of examples that I have been distributing one is in tracker8.py available in my dex tracker project (url at bottom). What I did was use a main function. The code you are writing looks like it would be usefull for what I am doing and maybe something that would allow a series of numbers from a file into the column you are zeroing out might be a good contribution to my project :) ... http://www.stormpages. com/edexter/csound.html

[eric dexter]

Right now, I have this python script that lets me choose which column of a text file that I can zero out. Them column nubmer is stored as the variable 'elem'. I also was given a sample of taking in command line arguements. I was wondering if anyone could help me intergrate this into the code so that from the command line I can input a number and have the script zero out the column.

beginning text file:
#Number of Bits
12
#Data
0 0 0 0 0 0 0 0 0 0 0 0
12 5 3 4 6 4 5 4 7 5 5 10
24 9 7 7 13 7 9 9 14 10 10 20

text file after script has been run:
#Number of Bits
12
#Data
0 0 0 0 0 0 0 0 0 0 0 0
0 5 3 4 6 4 5 4 7 5 5 10
0 9 7 7 13 7 9 9 14 10 10 20
and this is what it does:

def nthzero(dataList, nth, n):
    '''
    Replace the nth element of each list in the data list with 'n'
    '''
    for item in dataList:
        item[nth] = n
    return dataList
 
fn = '/outfile.txt'
f = open(fn)
 
s = f.readline()
prefix = s
while s.strip() != '#Data':
    s = f.readline()
    prefix += s
    
lineList = [line.strip().split() for line in f.readlines()]
for line in f.readlines():
    lineList.append(line.strip().split())
 
f.close()
elem = 0
repl = '0'
lineList = nthzero(lineList, elem, repl)

fn1 = '/outfile.txt'
f = open(fn1, 'w')
outList = []
for line in lineList:
    outList.append(' '.join(line))
    
f.write('%s%s' % (prefix, '\n'.join(outList)))
f.close()

example of the command line

/usr/bin/python hello.py \"1, 2, 4, 6, 9\""

hello.py
import sys
names = sys.argv[1].split(', ')
list = []
for name in names:
   list.append(name)
print list
#print "Hello " + sys.argv[1]

output:
Hello [1, 2, 4, 6, 9]

I haven't tried this yet but another way to write your program may be to use vim as a com object (with pywin or maybe through wxpython). There was a recent post on the vim board that describes a way to insert a column...

http://groups.google.c om/group/vim-experiment/browse_thread/thread/447a01d7014be5c 9

This has all been pretty tempting but I have been coding other stuff

[bvdet]

Right now, I have this python script that lets me choose which column of a text file that I can zero out. Them column nubmer is stored as the variable 'elem'. I also was given a sample of taking in command line arguements. I was wondering if anyone could help me intergrate this into the code so that from the command line I can input a number and have the script zero out the column.

beginning text file:
#Number of Bits
12
#Data
0 0 0 0 0 0 0 0 0 0 0 0
12 5 3 4 6 4 5 4 7 5 5 10
24 9 7 7 13 7 9 9 14 10 10 20

text file after script has been run:
#Number of Bits
12
#Data
0 0 0 0 0 0 0 0 0 0 0 0
0 5 3 4 6 4 5 4 7 5 5 10
0 9 7 7 13 7 9 9 14 10 10 20
and this is what it does:

def nthzero(dataList, nth, n):
    '''
    Replace the nth element of each list in the data list with 'n'
    '''
    for item in dataList:
        item[nth] = n
    return dataList
 
fn = '/outfile.txt'
f = open(fn)
 
s = f.readline()
prefix = s
while s.strip() != '#Data':
    s = f.readline()
    prefix += s
    
lineList = [line.strip().split() for line in f.readlines()]
for line in f.readlines():
    lineList.append(line.strip().split())
 
f.close()
elem = 0
repl = '0'
lineList = nthzero(lineList, elem, repl)

fn1 = '/outfile.txt'
f = open(fn1, 'w')
outList = []
for line in lineList:
    outList.append(' '.join(line))
    
f.write('%s%s' % (prefix, '\n'.join(outList)))
f.close()

example of the command line

/usr/bin/python hello.py \"1, 2, 4, 6, 9\""

hello.py
import sys
names = sys.argv[1].split(', ')
list = []
for name in names:
   list.append(name)
print list
#print "Hello " + sys.argv[1]

output:
Hello [1, 2, 4, 6, 9]

At the command line: python code.py 1 2 4 6 9

Assign the following to variable 'elem':[code=Python]elem = [int(i) for i in sys.argv[1:]][/code]Following is the code I used:[code=Python]import sys

def nthzero(dataLis t, nthList, n):
'''
Replace the nth element of each list in dataList with 'n'
'''
for nth in nthList:
for item in dataList:
try:
item[nth] = n
except IndexError, e:
pass
return dataList

if __name__ == '__main__':

fn = 'datain.txt'
f = open(fn)

s = f.readline()
prefix = s
while s.strip() != '#Data':
s = f.readline()
prefix += s

lineList = [line.strip().sp lit() for line in f.readlines()]

f.close()
#elem = [1,2,3,4,8,9,15]

# Command Line
# C:\Python23>pyt hon nthzero.py 1 2 3 4 8 9 15
elem = [int(i) for i in sys.argv[1:]]

repl = '0'
lineList = nthzero(lineLis t, elem, repl)

fn1 = 'dataout.txt'
f = open(fn1, 'w')

outList = []

for line in lineList:
outList.append( ' '.join(line))

f.write('%s%s' % (prefix, '\n'.join(outLi st)))
f.close()[/code]

[ironmonkey69]

this script takes in numbers one at a time eventhough they are listed together. Is there a way that I can input an entire list, i.e. 0 1 2 3 4 5, from the command line and have the script zero them out? Kinda like the example:

import sys
names = sys.argv[1].split(', ')
list = []
for name in names:
    list.append(name)
print list
#print "Hello " + sys.argv[1]

[bartonc]

this script takes in numbers one at a time eventhough they are listed together. Is there a way that I can input an entire list, i.e. 0 1 2 3 4 5, from the command line and have the script zero them out? Kinda like the example:

import sys
names = sys.argv[1].split(', ')
list = []
for name in names:
    list.append(name)
print list
#print "Hello " + sys.argv[1]

You can put quotes around your command-line argument: "1, 2, 3" (I think).

[ironmonkey69]

As I said before, I am a noob at python and am trying to understand what is going on. I was wondering if you help me understand what a couple of the lines of the script are doing.

 lineList = [line.strip().split() for line in f.readlines()]

[ironmonkey69]

how does this script work?

[bartonc]

As I said before, I am a noob at python and am trying to understand what is going on. I was wondering if you help me understand what a couple of the lines of the script are doing.

 lineList = [line.strip().split() for line in f.readlines()]

That's called a list comprehension. In order to understand it, let's break it down:[CODE=python]tempList = f.readlines()
lineList = []
for line in tempList:
newLine = line.strip()
print newLine
wordList = newLine.split()
print wordList
lineList.append (wordList)
print lineList[/CODE]Does that help?

[ironmonkey69]

it helps a little more. Can you add some comments to the code to help me get a better a better understanding of which sections do what?