First version. Create a one-page pdf full of random additions.

main.py

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+#!/usr/bin/env python3
+
+import argparse
+from random import randint
+from reportlab.pdfgen import canvas
+from reportlab.lib.pagesizes import A4
+from reportlab.lib.units import mm, cm
+
+def draw_seyes_grid(canvas, x_offset, y_offset):
+    # x, y: pdf coordinates
+    canvas.setStrokeColor("lightblue")
+    xs = [x*8*mm + x_offset for x in range(0,5)]
+    ys = [x*2*mm + y_offset for x in range(0, 4*3)]
+    canvas.grid(xs, ys)
+
+    canvas.setStrokeColor("purple")
+    xs = [x*8*mm + x_offset for x in range(0,5)]
+    ys = [y*8*mm +y_offset for y in range(0,4)]
+    canvas.grid(xs, ys)
+
+    canvas.setStrokeColor("black")
+    canvas.line(x_offset + 1*mm, y_offset + 6*mm, x_offset + 31*mm, y_offset + 6*mm)
+
+
+
+def draw_char(canvas, x_origin, y_origin, x, y, mychar):
+    # x_origin, y_origin : pdf coordinates
+    # x, y: represent a cell number, a cell is 8*8mm (seyes ruling)
+
+    canvas.drawCentredString(x_origin + x*8*mm + 4*mm,
+                             y_origin + y*8*mm + 0.5*mm,
+                             mychar)
+
+def draw_number(canvas, x_offset, y_offset, num, line):
+    digits = list(str(num))
+    pos = [3, 2, 1]
+    for (digit, column_nb) in zip(reversed(digits), [3,2,1]):
+        draw_char(canvas, x_offset, y_offset, column_nb, line, digit)
+
+
+def draw_addition(canvas, x_offset, y_offset, a, b):
+    # Draw "a+b" operation
+
+    # First, draw a seyes-like grid
+    draw_seyes_grid(canvas, x_offset, y_offset)
+
+    # draw first number
+    draw_number(canvas, x_offset, y_offset, a, 2)
+    # draw operator
+    draw_char(canvas, x_offset, y_offset, 0, 1, "+")
+    # draw second number
+    draw_number(canvas, x_offset, y_offset, b, 1)
+
+
+def main(outfile):
+    # reportlab setup
+    c = canvas.Canvas(outfile, pagesize=A4)
+    c.setFont('Helvetica', 22)
+
+    for i in range(5):
+        for j in range(7):
+            x = 0.8*cm + i*4*cm
+            y = 26*cm - j*4*cm
+            draw_addition(c, x, y, randint(1, 999), randint(1, 999))
+
+    # reportlab: end page + save pdf
+    c.showPage()
+    c.save()
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument("out", help="Name of output pdf file")
+    parser.parse_args()
+    main("plop.pdf")