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Docs: Python mode in the formula bar (UI parity, functions, architecture, control protocol, roadmap)

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ui-parity.md gains a Python mode row and a shortcut row for
Ctrl+Alt+Shift+P with its Mac form. function-parity.md's Python in
cells row names Python mode. architecture.md describes Python mode on
the shared editor, code_field and its stop keys, and drafts that follow
their sheet by its identity. control-protocol.md lists ui.pythonMode,
the editor's python flag in ui.inspect, and when ui.inspect leaves a
draft out.
ROADMAP.md records the progress.
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2026-11-01 21:02:03 -05:00
parent 6ed56683bf
commit 3bec72f643
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# Function parity: worksheet functions and formulas
> **Last reviewed:** 2026-10-31 · **Last updated:** 2026-11-01 · **Change:** minor (the Python errors `#PYTHON!`, `#BUSY!`, `#TIMEOUT!` and `#BLOCKED!`, and a Python in cells row; earlier: YEARFRAC basis 0 February-end rule, MOD quotient limit, PERCENTRANK significance; earlier: edge cases matched to Excel: base conversions, BITLSHIFT/BITRSHIFT, UNICHAR noncharacters, UPPER/LOWER/PROPER casing, FIXED/DOLLAR output, F/T/GAMMA/WEIBULL/BETA distributions, BINOM trial cap, HARMEAN; earlier: ECMA.CEILING listed with USDOLLAR as not on Microsoft's list; earlier: IMSQRT reproduces the stray real part Excel gives for negative reals) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
> **Last reviewed:** 2026-10-31 · **Last updated:** 2026-11-01 · **Change:** minor (Python cells are edited in the formula bar; earlier: the Python errors `#PYTHON!`, `#BUSY!`, `#TIMEOUT!` and `#BLOCKED!`, and a Python in cells row; earlier: YEARFRAC basis 0 February-end rule, MOD quotient limit, PERCENTRANK significance; earlier: edge cases matched to Excel: base conversions, BITLSHIFT/BITRSHIFT, UNICHAR noncharacters, UPPER/LOWER/PROPER casing, FIXED/DOLLAR output, F/T/GAMMA/WEIBULL/BETA distributions, BINOM trial cap, HARMEAN; earlier: ECMA.CEILING listed with USDOLLAR as not on Microsoft's list; earlier: IMSQRT reproduces the stray real part Excel gives for negative reals) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
Excel's worksheet functions, category by category, against GridCraft's function library. Part of
[target-app-parity.md](target-app-parity.md); gaps feed [gaps.md](gaps.md).
@@ -98,7 +98,7 @@ This improves series preparation; it does not change the model-fitting or season
| Localized function names and `;` separators | **missing** (#45); en-US only |
| Long flat operator chains (`=A1+A2+…`, `-`, `*`, `/`, `^`, `&`, comparisons) | done: no operand limit below Excel's 8,192-character formula limit (Excel, observed: `=1+1+…` with 4,096 operands is exactly 8,192 characters with the `=` and calculates; one more character is refused). Evaluated (#484), printed (#628), stored, copied, adjusted, saved and reopened without recursing once per operand, on a 1 MiB stack (#916); written to XLSX as plain formulas, not dynamic arrays; Spanish entry accepts them |
| Error values | the seven classic errors plus `#SPILL!`, `#CALC!`, `#GETTING_DATA`, and the Python errors `#PYTHON!`, `#BUSY!`, `#TIMEOUT!`, `#BLOCKED!` done; `#FIELD!`, `#CONNECT!`, `#UNKNOWN!` missing (minor: they come from data types and cloud features). `ERROR.TYPE` gives 11 for `#BLOCKED!` as Excel does; Microsoft documents no number for `#PYTHON!`, `#BUSY!` or `#TIMEOUT!`, and GridCraft gives them 19, 20 and 21 |
| Python in cells | partial: Python cells are stored, edited (`python.set`), copied, moved and saved, and Excel's `_xlfn._xlws.PY` cells open with their cached results; the code doesn't run, so new or changed code shows `#BLOCKED!`. Typing `=PY(` is refused with a pointer to `python.set`, so `PY` stays counted as missing above |
| Python in cells | partial: Python cells are stored, edited (`python.set`, and Python mode in the formula bar: Ctrl+Alt+Shift+P or `=PY` then Tab), copied, moved and saved, and Excel's `_xlfn._xlws.PY` cells open with their cached results; the code doesn't run, so new or changed code shows `#BLOCKED!`. Typing `=PY(` and Enter is refused with a pointer to `python.set`, so `PY` stays counted as missing above |
## Depth (estimated)
@@ -134,6 +134,7 @@ workbooks; results checked in as data, not Excel files) and fixing what it finds
| Date | Change | Summary |
|---|---|---|
| 2026-11-01 | minor | Python in cells row: Python mode in the formula bar |
| 2026-11-01 | minor | Python in cells (stored, not run): `#PYTHON!`, `#BUSY!`, `#TIMEOUT!` and `#BLOCKED!` done, with their `ERROR.TYPE` numbers; `PY` still counted as missing |
| 2026-10-31 | minor | BIN2*, HEX2* and OCT2* reject surrounding spaces and tabs in source strings with `#NUM!`, matching Excel; plain unpadded values remain valid |
| 2026-10-31 | minor | DEC2BIN, DEC2HEX and DEC2OCT validate `places` before returning negative two's-complement output, and Boolean places return `#VALUE!`, matching Excel |