Example

# Generated by OpenSesame 2.9.7 (Hesitant Heisenberg)
# Mon Mar 21 15:08:16 2016 (nt)
# <http://www.cogsci.nl/opensesame>

set background "white"
set bidi "no"
set canvas_backend "legacy"
set compensation "0"
set coordinates "relative"
set custom_cursor "yes"
set description "Default description"
set enable_escape "no"
set font_bold "no"
set font_family "mono"
set font_italic "no"
set font_size "18"
set foreground "black"
set height "1050"
set keyboard_backend "legacy"
set mouse_backend "legacy"
set pygame_window_frame "yes"
set sampler_backend "legacy"
set start "experiment"
set subject_nr "0"
set subject_parity "even"
set synth_backend "legacy"
set title "Example"
set transparent_variables "no"
set width "1680"

define form_text_input Ask_Number
	set cols "1"
	set description "A simple text input form"
	set form_question "Enter a number"
	set form_title "Title"
	set form_var "resp"
	set rows "1;1;6"
	widget 0 0 1 1 label text="[form_title]"
	widget 0 1 1 1 label center="no" text="[form_question]"
	widget 0 2 1 1 text_input focus="yes" return_accepts="yes" var="[form_var]"


define inline_script check_numeric_andLog
	set _prepare ""
	___run__
	while True:

		u = unicode(self.get("resp"))

		if not u.isnumeric():
			# Ask the participant to enter a numeric value:
			exp.items['please_numeric'].prepare()
			exp.items['please_numeric'].run()

			# Rerun the item (after preparing it):
			exp.items['Ask_Number'].prepare()
			exp.items['Ask_Number'].run()
		else:
			self.log(self.get("resp"))

			break
	__end__
	set description "Executes Python code"

define sequence experiment
	run Ask_Number "always"
	run check_numeric_andLog "always"
	run please_numeric "never"

define form_base please_numeric
	# widget 6 10 1 1 image_button path="next.png" var="response"
	set cols "1;1;1;1;1;1;1"
	set description "A generic form plug-in"
	set rows "1;1;1;1;1;1;1;1;1;1;1;1"
	widget 0 1 7 1 label text="Please enter number"
	widget 5 10 1 1 button text="OK"