add 2020b version of Excel demo

needs pyargs() for all keyword arguments

Author: AlDanial

matlab_expo_2022/demo_openpyxl.m

@@ -1,7 +1,6 @@
 % Al Danial, David Garrison
-Im = @py.importlib.import_module;
-OP = Im("openpyxl");
-styles = Im("openpyxl.styles");
+OP = imp("openpyxl");
+styles = imp("openpyxl.styles");
 Font = styles.Font;
 Alignment = styles.Alignment;
 PatternFill = styles.PatternFill;

matlab_expo_2022/demo_openpyxl_2020b.m

@@ -0,0 +1,67 @@
+% Al Danial, David Garrison
+% This version works with MATLAB 2020b and newer
+% Note: 2020b requires Pyton v3.7 or v3.8
+OP = imp("openpyxl");
+styles = imp("openpyxl.styles");
+Font = styles.Font;
+Alignment = styles.Alignment;
+PatternFill = styles.PatternFill;
+book = OP.Workbook();
+sheet = book.active;
+sheet.title = "Pets by weight";
+
+% font styles, background color
+ft_title = Font(...
+    pyargs("name","Arial", ...
+    "size",int64(14),"bold",py.True));
+ft_red = Font(pyargs("color","00FF0000"));
+ft_italics = Font(pyargs("bold",py.True,...
+                  "italic",py.True));
+bg_green = PatternFill( pyargs(...
+    "fgColor","C5FD2F","fill_type","solid"));
+
+sheet.merge_cells("B2:D3");
+B2 = sheet.cell(2,2);
+B2.value = "My Pets";
+B2.font = ft_title;
+B2.alignment = Alignment(pyargs(...
+ "horizontal","center","vertical","center"));
+
+% column headings
+category={"Name","Animal","weight [kg]"};
+row = int64(4); col = int64(1);
+for i = 1:length(category)
+  nextCell = sheet.cell(row, col+i);
+  nextCell.value = category{i};
+  nextCell.fill = bg_green;
+end
+
+pets = {{"Nutmeg", "Rabbit", 2.5},...
+        {"Annabel", "Dog", 4.3},  ...
+        {"Sunny", "Bird", 0.02},  ...
+        {"Harley", "Dog", 17.1},  ...
+        {"Toby", "Dog", 24.0},    ...
+        {"Mr Socks", "Cat", 3.9}};
+
+for P = pets
+  row = row + 1;
+  for j = 1:length(category)
+    nextCell = sheet.cell(row,col+j);
+    nextCell.value = P{1}{j};
+    if j == 3 && P{1}{j} < 0.1
+      nextCell = sheet.cell(row,col+j);
+      nextCell.font = ft_red;
+    end
+  end
+end
+
+% equation to sum all weights
+eqn = sprintf("=SUM(D4:D%d)", row);
+nextCell = sheet.cell(row+1, 4);
+nextCell.value = eqn;
+
+nextCell = sheet.cell(row+1, 2);
+nextCell.value = "Total weight:";
+nextCell.font = ft_italics;
+
+book.save("pets.xlsx")