Optional arguments argparse

optional arguments argparse

Introduction to basic functionality of the python argparse module. In this case we added the optional parameter --repeat which specifies how. Instead of handling vfb-community.de directly, use Python's argparse library. to adding optional arguments/flags, it makes sense to use argparse, the recommended. One area in which argparse differs from optparse is the treatment of non-optional argument values. While optparse sticks to option parsing, argparse is a full. The first step in using the argparse is creating an ArgumentParser object: >>> . positional arguments: bar bar help optional arguments: h, --help show this help. import argparse parser = vfb-community.dentParser() vfb-community.de_args() $ python vfb-community.de --help usage: vfb-community.de [-h] optional arguments. python vfb-community.de -h usage: vfb-community.de [-h] -H HOST [-p PORT] [-u USER] Script to learn basic argparse optional arguments: h, --help show this help message and exit.

Argparse Tutorial — Python documentation

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Is there a way to optional arguments argparse sure that if one specific argument is selected, another one MUST be specified? For instance, if -o is specified, it must also contain -n before or after -o. The result is that, if only -o is specified, the script exits as expectedhowever, if -n is added, the first condition is True.

How would I modify this such that if only -n is specified, the 1st condition is true and if -o is specified, it requires -n too and then executes the 3rd condition? Or is there an in-built function in argparse for this? You could check for outfile and number first, or you could change the logic in the first if statement to if number and not outfile. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of serviceprivacy policy and cookie optional arguments argparseand that your continued use of the website is subject to optional arguments argparse policies.

Choose multiple optional arguments with argparse in Python 3 Ask Question. I am using argparse in Python 3 to accept command-line arguments into a script.

Set or Use a default value I tried adding an if condition, like so: Testing after parsing works well, especially considering that the arguments can occur in any order.

Rach Sharp Rach Sharp 3 Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Post Your Answer Discard By clicking "Post Your Answer", you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that optional arguments argparse continued use of the website is subject to these policies.

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This tutorial is intended to be a gentle introduction to argparse optional arguments argparse, the recommended command-line parsing module in the Python standard library. This was written for argparse in Python 3.

A few details are different in 2. There are two other modules that fulfill the same task, namely getopt an equivalent for getopt from the C language and the deprecated optparse. Note also that argparse is based on optparseand therefore very similar in terms of usage. Note however that, although the help display looks nice and all, it currently is not as helpful as it can be.

So far we have been playing with positional arguments. Let us have a look on how to add optional ones:. The above example accepts arbitrary integer values for --verbositybut for our simple program, only two values are actually useful, True or False.

How about we give this program of ours back the ability to have multiple verbosity values, and actually get to use them:. These all look good except lfs rb4 skins last one, which exposes a bug in our program. It also matches the way the CPython executable handles its own verbosity argument check the optional arguments argparse of python --help:.

Optional arguments argparse following example instead uses verbosity level to display more text instead:. So far, we have been working with two methods of an argparse. ArgumentParser instance.

It allows for us to specify options that conflict with each other. That should be easy to follow. Note that slight difference in the usage text.

Note the [-v -q]which tells us that we can either use -v or -qbut not both at the same time:. The argparse module offers a lot more than shown here. Its docs are quite detailed and thorough, and full of examples.

Having gone through this tutorial, you should easily digest optional arguments argparse without feeling overwhelmed. Python Frequently Asked Questions. Tshepang Lekhonkhobe This tutorial is intended to be a gentle introduction to argparsethe recommended command-line parsing module in the Python optional arguments argparse library.

Note There are two other modules that fulfill the same task, namely getopt an equivalent for getopt from the C language and the deprecated optparse. List information about the FILEs the current directory by default. Sort entries alphabetically if none of -cftuvSUX nor --sort is specified. ArgumentParser parser. File "prog. Let us have a look on how to add optional ones: Quick search. The Python Software Foundation is a non-profit corporation. Please donate.

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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I have a script which is meant to be used like this: I want the dir to be optional: Unfortunately when I don't specify the dir argument, I get Error: Too few arguments. As an extension to VinaySajip answer.

There are additional nargs worth mentioning. All command-line arguments present are gathered into a list. All the remaining command-line arguments are gathered into a list. This is commonly useful for command line utilities that dispatch to other command line utilities.

If the nargs keyword argument is not provided, the number of arguments consumed is determined by the action. Generally this means a single command-line argument will be consumed and a single item not a list will be produced. Here is a sample snippet with Python 2. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Argparse optional positional arguments? Ask Question. Waldo Bronchart Waldo Optional arguments argparse 3, 2 18 Vinay Sajip Vinay Sajip Do the? See docs. Access dir from options. N arguments from the command line optional arguments argparse be gathered together into a list parser. This is commonly useful for command line utilities that dispatch to other command line utilities If the nargs keyword argument is not provided, the number of arguments consumed optional arguments argparse determined by the action.

Matas Vaitkevicius Matas Vaitkevicius A-B-B Last line of the answer Generally this means a single command-line argument will be consumed and a single item not a list will be produced. Hope this helps The docs say: One argument will be consumed from the command line if possible, and produced as a single item. If no command-line argument is present, the value from default will be produced. A-B-B Just edit the answer if you feel that something is missing. Aug 8 '18 at OP optional arguments argparse asking about positional params, not '--dir'.

And 'false' was optional arguments argparse typo, she meant 'False'. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Optional arguments argparse. Time pass mobile movie Required, but never shown.

Post Your Answer Discard By clicking "Post Your Answer", you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Linked 0. Related Hot Network Questions. Stack Overflow works best with JavaScript enabled.

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