examples: show how to call a simple v module from python (#13105)

cmd/tools/modules/testing/common.v

@@ -176,6 +176,7 @@ pub fn new_test_session(_vargs string, will_compile bool) TestSession {
 		}
 		if testing.github_job != 'ubuntu-tcc' {
 			skip_files << 'examples/c_interop_wkhtmltopdf.v' // needs installation of wkhtmltopdf from https://github.com/wkhtmltopdf/packaging/releases
+			skip_files << 'examples/call_v_from_python/test.v' // the example only makes sense to be compiled, when python is installed
 			// the ttf_test.v is not interactive, but needs X11 headers to be installed, which is done only on ubuntu-tcc for now
 			skip_files << 'vlib/x/ttf/ttf_test.v'
 			skip_files << 'vlib/vweb/vweb_app_test.v' // imports the `sqlite` module, which in turn includes sqlite3.h
@@ -456,7 +457,7 @@ pub fn prepare_test_session(zargs string, folder string, oskipped []string, main
 			}
 		}
 		c := os.read_file(f) or { panic(err) }
-		maxc := if c.len > 300 { 300 } else { c.len }
+		maxc := if c.len > 500 { 500 } else { c.len }
 		start := c[0..maxc]
 		if start.contains('module ') && !start.contains('module main') {
 			skipped_f := f.replace(os.join_path_single(parent_dir, ''), '')

examples/call_v_from_python/README.md

@@ -0,0 +1,5 @@
+A simple example to show how to call a function written in v from python
+
+Step 1: Compile the v code to a shared library using ``v -shared -prod test.v``
+
+Step 2: Run the python file using ``python3 test.py``

examples/call_v_from_python/test.py

@@ -0,0 +1,4 @@
+from ctypes import *
+so_file="./test.so"
+my_functions = CDLL(so_file)
+print(my_functions.square(10))

examples/call_v_from_python/test.v

@@ -0,0 +1,6 @@
+module test
+
+[export: 'square']
+fn square(i int) int {
+	return i * i
+}