Python get arguments from shell
If there is space in between argument and argument is not in quotes, then python consider as two different arguments. Show
That's why the output of print data in the python code is just 1. Check the below output.
So, in your shell script, put $var1 in quotes. Content of shell script(a.sh):
Content of python code(dsp.py):
Output: Watch Now This tutorial has a related video course created by the Real Python team. Watch it together with the written tutorial to deepen your understanding: Command Line Interfaces in Python Adding the capability of processing Python command line arguments provides a user-friendly interface to your text-based command line program. It’s similar to what a graphical user interface is for a visual application that’s manipulated by graphical elements or widgets. Python exposes a mechanism to capture and extract your Python command line arguments. These values can be used to modify the behavior of a program. For example, if your program processes data read from a file, then you can pass the name of the file to your program, rather than hard-coding the value in your source code. By the end of this tutorial, you’ll know:
If you want a user-friendly way to supply Python command line arguments to your program without importing a dedicated library, or if you want to better understand the common basis for the existing libraries that are dedicated to building the Python command line interface, then keep on reading! The Command Line InterfaceA command line interface (CLI) provides a way for a user to interact with a program running in a text-based shell interpreter. Some examples of shell interpreters are Bash on Linux or Command Prompt on Windows. A command line interface is enabled by the shell interpreter that exposes a command prompt. It can be characterized by the following elements:
Not every command line interface may provide all these elements, but this list isn’t exhaustive, either. The complexity of the command line ranges from the ability to pass a single argument, to numerous arguments and options, much like a Domain Specific Language. For example, some programs may launch web documentation from the command line or start an interactive shell interpreter like Python. The two following examples with the Python command illustrates the description of a command line interface:
In this first
example, the Python interpreter takes option Another example shows how to invoke Python with
Try this out in your terminal to see the complete help documentation. The C LegacyPython command line arguments directly inherit from the C programming language. As Guido Van Rossum wrote in An
Introduction to Python for Unix/C Programmers in 1993, C had a strong influence on Python. Guido mentions the definitions of literals, identifiers, operators, and statements like To illustrate the similarities, consider the following C program:
Line 4 defines
You can compile the code above on Linux with
Unless explicitly expressed at the command line with the option Let’s spice up this example by passing a few Python command line arguments to the same program:
The output shows that the number of arguments is The compilation of
If you’ve installed Microsoft Visual Studio or the Windows Build Tools, then you can compile You’ll obtain an executable named
You could implement a Python program,
You don’t see an Also, note that Execute
With this short introduction into a few arcane aspects of the C language, you’re now armed with some valuable knowledge to further grasp Python command line arguments. Two Utilities From the Unix WorldTo use Python command line arguments in this tutorial, you’ll implement some partial features of two utilities from the Unix ecosystem:
You’ll gain some familiarity with these Unix tools in the following sections.
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