Change from print-based to data-based output.

.flake8

 [flake8]
+extend-ignore = D105
 per-file-ignores =
 	tests/*: D103
 max-line-length = 99

highlight.css

+/*
+.case { color: ; }
+.splat { color: ; }
+.array { color: ; }
+.parse-error { color: ; }
+.parameter { color: ; }
+.string { color: ; }
+.regex { color: ; }
+.invoke { color: ; }
+.default { color: ; }
+.call { color: ; }
+.qr { color: ; }
+.lambda { color: ; }
+.number { color: ; }
+.regex-body { color: ; }
+.call-method { color: ; }
+*/
+
+.literal { color: green; }
+.true {}
+.false {}
+.undef {}
+
+.keyword { color: orange; }
+.class {}
+.or {}
+.define {}
+.unless {}
+.if {}
+.else {}
+.function {}
+.and {}
+.in {}
+
+.type { color: darkgreen; }
+.qn { color: darkgreen; }
+
+.var { color: blue; }
+.str-var { color: blue; }
+
+.name { color: red; }
+
+.string {
+	color: olive;
+}

style.css

-.qn {
-	color: green;
-}
-
-.var {
-	color: blue;
-}
-
-.define {
-	color: orange;
-}
-
-.name {
-	color: red;
-}
-
-.string {
-	color: olive;
-}
-
-.str-var {
-	color: pink;
-}
-
-.qr {
-	color: darkgreen;
-}
-
-.compound-type {
-	color: lightblue;
-}
-
-.undef {
-	color: lightgray;
-}
-
-.number {
-	color: red;
-}
 
 /* -------------------------------------------------- */
 
@@ -57,6 +18,11 @@ h2 {
 
 /* -------------------------------------------------- */
 
+.documentation {
+	display: none;
+}
+
+/*
 .var {
 	position: relative;
 }
@@ -74,3 +40,4 @@ h2 {
 .var:hover .documentation {
 	display: block;
 }
+*/

tests/test_intersperse.py

+from main import intersperse
+
+def test_intersperse():
+    assert list(intersperse(1, [2, 3, 4])) == [2, 1, 3, 1, 4]
+
+def test_intersperse_empty():
+    assert list(intersperse(1, [])) == []