Help with command line arguements

[ironmonkey69]

I need help being able to pass a number from a command line into a script that zeroes out columns of a text file. Using python 2.0.

Here is what the text file looks like:

#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

and this is what it does:

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

Here is what the Python 2.0 code looks like:

...
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.next()
prefix = s
while s.strip() != '#Data':
    s = f.next()
    prefix += s
    
lineList = [line.strip().split() for line in f]
 
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()
...

[bartonc]

I need help being able to pass a number from a command line into a script that zeroes out columns of a text file. Using python 2.0.

Here is what the text file looks like:

#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

and this is what it does:

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

Here is what the Python 2.0 code looks like:

...
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.next()
prefix = s
while s.strip() != '#Data':
    s = f.next()
    prefix += s
    
lineList = [line.strip().split() for line in f]
 
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()
...

It looks like your program may have some logic error around here:

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

but here's how you go about getting the command-line args:[CODE=python]import sys
print sys.argv[0] # Always contains the name of the file being executed.
print sys.argv[1:] # Use a slice to avoid index errors.[/CODE]Hope that helps.

[ironmonkey69]

now that I can get the command line arguemet into the python script, can you help me get more than one variable into the 'elem=' lin to accept more than one number to zero out more than one columns?