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I want my .py file to accept file I give as input in command line. I used the sys.argv[] and also fileinput but I am not getting the output.
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To run Python scripts with the python command, you need to open a command-line and type in the word python , or python3 if you have both versions, followed by the path to your script, just like this: $ python3 hello.py Hello World!
To access command-line arguments from within a Python program, first import the sys package. You can then refer to the full set of command-line arguments, including the function name itself, by referring to a list named argv. In either case, argv refers to a list of command-line arguments, all stored as strings.
option. You can test command line arguments by running an executable from the "Command Prompt" in Windows or from the "DOS prompt" in older versions of Windows. You can also use command line arguments in program shortcuts, or when running an application by using Start -> Run.
To use it, you just pass a path or filename into a new Path() object using forward slashes and it handles the rest: Notice two things here: You should use forward slashes with pathlib functions. The Path() object will convert forward slashes into the correct kind of slash for the current operating system.
If you will write the following script:
#!/usr/bin/env python
import sys
with open(sys.argv[1], 'r') as my_file:
print(my_file.read())
and run it, it will display the content of the file whose name you pass in the first argument like that:
./my_script.py test.txt
(in the above example this file will be test.txt).
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