projects / OpenSPARC-T2-SAM / blame
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| 54 | <H3><A NAME="SECTION0082113000000000000000"></A><A NAME="optparse-what-positional-arguments-for"></A> | |
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| 56 | 6.21.1.3 What are positional arguments for? | |
| 57 | </H3> | |
| 58 | ||
| 59 | <P> | |
| 60 | Positional arguments are for those pieces of information that your | |
| 61 | program absolutely, positively requires to run. | |
| 62 | ||
| 63 | <P> | |
| 64 | A good user interface should have as few absolute requirements as | |
| 65 | possible. If your program requires 17 distinct pieces of information in | |
| 66 | order to run successfully, it doesn't much matter <em>how</em> you get that | |
| 67 | information from the user--most people will give up and walk away | |
| 68 | before they successfully run the program. This applies whether the user | |
| 69 | interface is a command-line, a configuration file, or a GUI: if you make | |
| 70 | that many demands on your users, most of them will simply give up. | |
| 71 | ||
| 72 | <P> | |
| 73 | In short, try to minimize the amount of information that users are | |
| 74 | absolutely required to supply--use sensible defaults whenever | |
| 75 | possible. Of course, you also want to make your programs reasonably | |
| 76 | flexible. That's what options are for. Again, it doesn't matter if | |
| 77 | they are entries in a config file, widgets in the ``Preferences'' dialog | |
| 78 | of a GUI, or command-line options--the more options you implement, the | |
| 79 | more flexible your program is, and the more complicated its | |
| 80 | implementation becomes. Too much flexibility has drawbacks as well, of | |
| 81 | course; too many options can overwhelm users and make your code much | |
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