How to use sys.argv in Python

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How to use sys.argv in Python

The sys module is one of the common and frequently used modules in Python. In this article, we will walk you through how to use the sys module. We will learn about what argv[0] and sys.argv[1] are and how they work. We will then go into how to parse Command Line options and arguments, the various ways to use argv and how to pass command line arguments in Python 3.x 

In simple terms,Command Line arguments are a way of managing the script or program externally by providing the script name and the input parameters from command line options while executing the script. Command line arguments are not specific just to Python. These can be found in other programming languages like C, C# , C++, PHP, Java, Perl, Ruby and Shell scripting. 

sys.argv is a list in Python that contains all the command-line arguments passed to the script. It is essential in Python while working with Command Line arguments. Let us take a closer look with a few examples. 

With the len(sys.argv) function, you can count the number of arguments. 

To use sys.argv, you will first need to the sys module. 

Remember that sys.argv[0] is the name of the script. 

Here – Script name is sysargv.py 

Output:

When a python script is executed with arguments, it is captured by Python and stored in a list called sys.argv. 

So, if the below script is executed: 

Then inside sample.py, arguments are stored as: 

Here,sys.argv[0] is always the filename/script executed and sys.argv[1] is the first command line argument passed to the script . 

Python provides a module named as getopt which helps to parse command line options and arguments. Itprovides a function – getopt, whichis used for parsing the argument sequence:sys.argv. 

Below is the syntax: 

Output:

Command line arguments are parameters passed to a program/script at runtime. They provide additional information to the program so that it can execute. 

It allows us to provide different inputs at the runtime without changing the code. 

Here is a script named as argparse_ex.py: 

Here we need to import argparse package 

Then we need to instantiate the ArgumentParser object as parser. Then in the next line , we add the only argument, –name . We must specify either shorthand (-n) or longhand versions (–name)  where either flag could be used in the command line as shown above . This is a required argument as mentioned by required=True 

Output:  

The example above must have the –name or –n option, or else it will fail.

Here, we need to slice the list to access all the actual command line arguments. 

Output:

Below script – password_gen.py is used to generate a secret password by taking password length as command line argument.

Output:

Let us summarize what we’ve learnt so far. We have seen how to use the sys module in Python, we have looked at what areargv[0] and sys.argv[1] are and how they work, what Command Line arguments are and why we use them and how to parse Command Line options and arguments. We also dived into multiple ways to use argv and how to pass command line arguments in Python 3.x

Hope this mini tutorial has been helpful in explaining the usage of sys.argv and how it works in Python. Be sure to check out the rest of the tutorials on KnowledgeHut’s website and don’t forget to practice with your code! 

  • sys.argv[0] == ‘sample.py’ 
  • sys.argv[1] == ‘Hello’ 
  • sys.argv[2] == ‘Python’
  • argv: argument list to be passed.
  • shortopts: String of short options as list . Options in the arguments should be followed by a colon (:)
  • .longopts: String of long options as list. Options in the arguments should be followed by an equal sign (=). 
  • argv represents an array having the command line arguments of thescript . 
  • Remember that here, counting starts fromzero [0], not one (1). 
  • To use it, we first need to import sys module (import sys). 
  • The first argument, sys.argv[0], is always the name of the script and sys.argv[1] is the first argument passed to the script. 
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