cmake: Disable line_balancing_sat.py

need input file

examples/python/CMakeLists.txt

@@ -4,6 +4,7 @@ endif()
 
 file(GLOB PYTHON_SRCS "*.py")
 # Remove too long examples
+list(FILTER PYTHON_SRCS EXCLUDE REGEX ".*/line_balancing_sat.py") # need input file
 list(FILTER PYTHON_SRCS EXCLUDE REGEX ".*/arc_flow_cutting_stock_sat.py") # too long
 list(FILTER PYTHON_SRCS EXCLUDE REGEX ".*/bus_driver_scheduling_sat.py") # too long
 list(FILTER PYTHON_SRCS EXCLUDE REGEX ".*/cover_rectangle_sat.py") # too long

examples/python/line_balancing_sat.py

@@ -340,6 +340,8 @@ def solve_scheduling_model(model, hint):
 def main(argv: Sequence[str]) -> None:
     if len(argv) > 1:
         raise app.UsageError('Too many command-line arguments.')
+    if FLAGS.input == '':
+        raise app.UsageError('Missing input file.')
 
     model = read_model(FLAGS.input)
     print_stats(model)