National Radio
Astronomy Observatory

B.4 Lists and Ranges

Sometimes, you need to give a task a list of indices. For example, some tasks and tools expect a comma-separated Python list, e.g.

You can use the Python range function to generate a list of consecutive numbers, e.g.

giving the same list as above, e.g.

Note that range starts from the first limit and goes to one below the second limit (Python is 0-based, and range is designed to work in loop functions). If only a single limit is given, the first limit is treated as 0, and the one given is used as the second, e.g.

You can also combine multiple ranges by summing lists

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