[Solved] Howler

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Write a program that uppercases the given text:

$ ./howler.py 'The quick brown fox jumps over the lazy dog.'THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.

If the text names a file, uppercase the contents of the file:

$ ./howler.py ../inputs/fox.txtTHE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.

If given no arguments, print a brief usage:

$ ./howler.pyusage: howler.py [-h] [-o str] strhowler.py: error: the following arguments are required: str

If the -o or --outfile option is present, write the output to the given file and print nothing:

$ ./howler.py ../inputs/fox.txt -o out.txt

There should now be an out.txt file with the contents:

$ cat out.txtTHE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.

Respond to -h or --help with a longer usage:

$ ./howler.py -husage: howler.py [-h] [-o str] strHowler (upper-cases input)positional arguments:  str                   Input string or fileoptional arguments:  -h, --help            show this help message and exit  -o str, --outfile str                        Output filename (default: )

Run the test suite to ensure your program is working correctly:

$ make testpytest -xv test.py============================= test session starts ==============================...collected 5 itemstest.py::test_exists PASSED                                              [ 20%]test.py::test_usage PASSED                                               [ 40%]test.py::test_text_stdout PASSED                                         [ 60%]test.py::test_text_outfile PASSED                                        [ 80%]test.py::test_file PASSED                                                [100%]============================== 5 passed in 0.40s ===============================