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Pranav Srinivas Kumar 2019-04-09 14:55:08 -04:00 committed by GitHub
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@ -84,7 +84,7 @@ Verbosity enabled
Here's what's happening:
* The program is written so as to display something when --verbose is specified and display nothing when not.
* To show that the option is actually optional, there is no error when running the program without it. Note that by using ```.default_value(false)```, if the optional argument isn’t used, it's value is automatically set to false.
* Since the argument is actually optional, no error is thrown when running the program without ```--verbose```. Note that by using ```.default_value(false)```, if the optional argument isn’t used, it's value is automatically set to false.
* By using ```.implicit_value(true)```, the user specifies that this option is more of a flag than something that requires a value. When the user provides the --verbose option, it's value is set to true.
### Combining Positional and Optional Arguments