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https://issues.apache.org/jira/browse/SYSTEMML-296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Dusenberry updated SYSTEMML-296:
-------------------------------------
Assignee: Tatsuya Nishiyama (was: Mike Dusenberry)
> Add elif (else if) to PyDML
> ---------------------------
>
> Key: SYSTEMML-296
> URL: https://issues.apache.org/jira/browse/SYSTEMML-296
> Project: SystemML
> Issue Type: Improvement
> Components: Parser, PyDML
> Reporter: Deron Eriksson
> Assignee: Tatsuya Nishiyama
> Priority: Minor
>
> "Else if" (elif) statements are useful since they avoid the need for nested
> if/else statements. Currently, DML has "else if" but PyDML does not have an
> equivalent "elif".
> As an example, here is DML containing "else if" statements:
> {code}
> x = 6
> if (x == 1) {
> print('A')
> } else if (x == 2) {
> print('B')
> } else if (x == 3) {
> print('C')
> } else if (x == 4) {
> print('D')
> } else if (x == 5) {
> print('E')
> } else {
> print('F')
> }
> {code}
> Here is the logical equivalent in PyDML using nested "if else" statements:
> {code}
> x = 6
> if (x == 1):
> print('A')
> else:
> if (x == 2):
> print('B')
> else:
> if (x == 3):
> print('C')
> else:
> if (x == 4):
> print('D')
> else:
> if (x == 5):
> print('E')
> else:
> print('F')
> {code}
> The nesting becomes especially challenging in a Python-like language as the
> number of nested "if else" statements increases due to the use of whitespace
> indentations to specify blocks of code.
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