4 files changed, 15 insertions, 15 deletions
diff --git a/libdimension-python/tests/canvas.py b/libdimension-python/tests/canvas.py
index 239a548..0f07d66 100755
--- a/libdimension-python/tests/canvas.py
+++ b/libdimension-python/tests/canvas.py
@@ -51,7 +51,7 @@ except OSError as e:
 canvas.clear(Blue)
 
 if have_PNG:
-    canvas.write_PNG('png.png')
+    canvas.write_PNG("png.png")
 
 #if haveGL:
 #    canvas.drawGL()
diff --git a/libdimension-python/tests/color.py b/libdimension-python/tests/color.py
index 363aa0d..88e0b42 100755
--- a/libdimension-python/tests/color.py
+++ b/libdimension-python/tests/color.py
@@ -25,9 +25,9 @@ from dimension import *
 die_on_warnings(True)
 
 c = Color(0, 0.5, 1, trans = 0.5, filter = 0.35)
-assert repr(c) == 'dimension.Color(0.0, 0.5, 1.0, 0.5, 0.35)', repr(c)
-assert str(c) == '<red = 0.0, green = 0.5, blue = 1.0, \
-trans = 0.5, filter = 0.35>', str(c)
+assert repr(c) == "dimension.Color(0.0, 0.5, 1.0, 0.5, 0.35)", repr(c)
+assert str(c) == "<red = 0.0, green = 0.5, blue = 1.0, \
+trans = 0.5, filter = 0.35>", str(c)
 assert c.red    == 0,    c.red
 assert c.green  == 0.5,  c.green
 assert c.blue   == 1,    c.blue
@@ -35,7 +35,7 @@ assert c.trans  == 0.5,  c.filter
 assert c.filter == 0.35, c.trans
 
 c = Color(1, 0.5, 0)
-assert str(c) == '<red = 1.0, green = 0.5, blue = 0.0>', str(c)
+assert str(c) == "<red = 1.0, green = 0.5, blue = 0.0>", str(c)
 
 assert Black   == Color(0, 0, 0), Black
 assert White   == Color(1, 1, 1), White
diff --git a/libdimension-python/tests/demo.py b/libdimension-python/tests/demo.py
index a9774bc..720a96c 100755
--- a/libdimension-python/tests/demo.py
+++ b/libdimension-python/tests/demo.py
@@ -56,4 +56,4 @@ scene.recursion_limit = 5
 scene.raytrace()
 
 if have_PNG:
-  canvas.write_PNG('demo.png')
+  canvas.write_PNG("demo.png")
diff --git a/libdimension-python/tests/geometry.py b/libdimension-python/tests/geometry.py
index cf9cb41..dddd4ea 100755
--- a/libdimension-python/tests/geometry.py
+++ b/libdimension-python/tests/geometry.py
@@ -37,8 +37,8 @@ v = Vector(1.5, 2.5, 3.5)
 assert v.x == 1.5, v.x
 assert v.y == 2.5, v.y
 assert v.z == 3.5, v.z
-assert repr(v) == 'dimension.Vector(1.5, 2.5, 3.5)', repr(v)
-assert str(v) == '<1.5, 2.5, 3.5>', str(v)
+assert repr(v) == "dimension.Vector(1.5, 2.5, 3.5)", repr(v)
+assert str(v) == "<1.5, 2.5, 3.5>", str(v)
 
 v = Vector(x = 2, y = 3, z = 6)
 
@@ -58,13 +58,13 @@ m = Matrix(1,  2,  3,  4,
            5,  6,  7,  8,
            9, 10, 11, 12)
 
-assert repr(m) == 'dimension.Matrix(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, \
-9.0, 10.0, 11.0, 12.0)', repr(m)
-assert str(m) == '\n' \
-                 '[1.0\t2.0\t3.0\t4.0]\n' \
-                 '[5.0\t6.0\t7.0\t8.0]\n' \
-                 '[9.0\t10.0\t11.0\t12.0]\n' \
-                 '[0.0\t0.0\t0.0\t1.0]', str(m)
+assert repr(m) == "dimension.Matrix(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, \
+9.0, 10.0, 11.0, 12.0)", repr(m)
+assert str(m) == "\n" \
+                 "[1.0\t2.0\t3.0\t4.0]\n" \
+                 "[5.0\t6.0\t7.0\t8.0]\n" \
+                 "[9.0\t10.0\t11.0\t12.0]\n" \
+                 "[0.0\t0.0\t0.0\t1.0]", str(m)
 
 s = scale(0.5)
 assert s == Matrix(0.5, 0,   0,   0,