fix: mvtbtool's %precision line spuriously echoes with --showassign - #79
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"_precision = %precision %.3g;" relied on the trailing ';' suppressing output, but IPython's magic-line parsing swallows the whole rest of the line -- including the ';' -- into %precision's own argument string, so it never functions as a suppression marker. This stayed latent by default (assignments aren't auto-displayed under the default ast_node_interactivity), but surfaces the moment --showassign is passed (same class of bug just fixed in rtbtool, and originally found in RVC3-python's rvctool): Out[1]: '%.3g;' printed right before the first real prompt. Wrap the magic call in run_line_magic() and print the result explicitly instead, so the last statement is a print() call, which is never auto-displayed regardless of ast_node_interactivity.
Up to standards ✅🟢 Issues
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| Metric | Results |
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| Complexity | 0 |
| Duplication | 0 |
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Summary
"_precision = %precision %.3g;"relied on the trailing;to suppress output, but IPython's magic-line parsing swallows the entire rest of the line — including the;— into%precision's own argument string, so it never actually functions as a suppression marker.ast_node_interactivity), but surfaces the moment--showassignis passed:Out[1]: '%.3g;'prints right before the first real prompt.rtbtool(fix: rtbtool's %precision line spuriously echoes its own return value robotics-toolbox-python#592), originally found while doing the equivalent fix in RVC3-python'srvctool.get_ipython().run_line_magic(...)and printing the result explicitly, so the line's last statement is aprint()call — never auto-displayed regardless ofast_node_interactivity.Test plan
mvtbtool(default) — confirmed clean, showsDefault numeric formatting: %.3gmvtbtool --showassign— confirmed clean too (this was the case that actually triggered the bug before)pytest tests/test_bin.py— 6 passed, 3 skipped (optional deps not installed)