I have a Python script that inputs all words from a file and sorts them in order:
with open(raw_input("Enter a file name: ")) as f :
for t in sorted(i for line in f for i in line.split()):
print t
But instead of asking every time for the input file I would like to choose the input file with a "-i" and save the output file with a "-o", this way:
python myscript.py -i input_file.txt -o output_file.txt
and BTW, how to save the output on a target file?
This should do it:
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('-i', dest='infile',
help="input file", metavar='INPUT_FILE')
parser.add_argument('-o', dest='outfile',
help='output file', metavar='OUTPUT_FILE')
args = parser.parse_args()
with open(args.infile, 'r') as infile:
indata = infile.read()
words = indata.split()
words.sort()
with open(args.outfile, 'w') as outfile:
for word in words:
outfile.write('{}\n'.format(word))
argparse is a built-in module for parsing command-line options. It does all the work for you.
$ ./SO_32030424.py --help
usage: SO_32030424.py [-h] [-i INPUT_FILE] [-o OUTPUT_FILE]
optional arguments:
-h, --help show this help message and exit
-i INPUT_FILE input file
-o OUTPUT_FILE output file
'w' on a pastebin?To get started on your parameters, take a look at sys.argv.
To write into an output file, use the write mode "w", and .write() to it.
For the latter there are definitely good tutorials out there.
sys.argv takes only bare parameters as a list but did not deal with flags like -i.