Python NameError: name 'file_name' is not defined

Question

I'm attempting to write a simple script that will take a filename from the command line and convert that file to a another format. Below is a small simple snippet of code that I am starting with but I keep getting this error: NameError: name 'file_name' is not defined

Here is the code, i'm on a Mac using python 2.7.10.

#!/usr/bin/env python
import sys
import argparse

parser = argparse.ArgumentParser(description='Convert Hex Files')
parser.add_argument('-f', dest=file_name, help='Please Enter the Path to Your File.', type=string)
parser.add_argument('-n', dest=line_length, help='Enter The Desired Line Length.', type=int)
args = parser.parse_args()

print args.file_name
print args.line_length

Matthew · Accepted Answer · 2016-02-16 01:15:37Z

6

In the argparse module, the destinations must be strings.

Therefore, you need to quote the vales that you are assigning to dest.

dest = "file_name"
dest = "line_length"

See the documentation of this option for full details.

answered Feb 16, 2016 at 1:15

Matthew

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2 Comments

DHW Over a year ago

Thank you this worked, I should've read the API more closely. I also had to remove the 'type=string' because it's a string by default as you mentioned.

Matthew Over a year ago

You're welcome. If this was helpful, please consider accepting this answer. You are not obligated to accept any answer, but that will mark the question as answered, and will award both the person who answered the question and yourself with a small amount of reputation. You can additionally upvote any answer that you find particularly useful.

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