2. Example 2: Generating help message using jcvi.apps.base OptionParserpython from jcvi.apps.base import OptionParser def main(): # Initialize OptionParser parser = OptionParser(usage="usage: %prog [options]") # Add command-line arguments parser.add_option("-i", "--input", dest="input_file", help="Input file path") # assign defaults to the options parser.set_defaults(input_file=None) # Parse command-line arguments options, args = parser.parse_args() # Access parsed arguments input_path = options.input_file # Print Help message parser.print_help() if __name__ == '__main__': main() ``` In the first example, the code is using jcvi.apps.base OptionParser to parse the command-line arguments by calling `parse_args()` and accessing the argument values by calling `options.input_file`. In the second example, the code is using jcvi.apps.base OptionParser to generate help message by calling `print_help()` method. It generates a help message that explains how to use the script along with the available options. The package library for jcvi.apps.base OptionParser is JCvi.