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In order to use it in a faster way you can install it, the file will be moved to /usr/local/bin, so the user doesnt need to referer to an specific path, also the file name need to be changed, this doesn't affect directly the program because you are actually specifying #!/usr/bin/python3 in your first line, so the file when executed as "w3c_validator file1" will execute python3 w3c_validator file1.