Fix SyntaxWarnings when building the docs and bump readthedocs to Python 3.13

.readthedocs.yml

@@ -3,7 +3,7 @@ build:
   os: ubuntu-22.04
 
   tools:
-    python: "3.11"
+    python: "3.13"
 
   apt_packages:
     - libpango1.0-dev

docs/source/examples.rst

@@ -341,7 +341,7 @@ Plotting with Manim
                 axes.i2gp(TAU, cos_graph), color=YELLOW, line_func=Line
             )
             line_label = axes.get_graph_label(
-                cos_graph, "x=2\pi", x_val=TAU, direction=UR, color=WHITE
+                cos_graph, r"x=2\pi", x_val=TAU, direction=UR, color=WHITE
             )
 
             plot = VGroup(axes, sin_graph, cos_graph, vert_line)
@@ -482,7 +482,7 @@ Plotting with Manim
                 tips=False,
             )
             labels = ax.get_axis_labels(
-                x_label=Tex("$\Delta Q$"), y_label=Tex("T[$^\circ C$]")
+                x_label=Tex(r"$\Delta Q$"), y_label=Tex(r"T[$^\circ C$]")
             )
 
             x_vals = [0, 8, 38, 39]
@@ -785,8 +785,8 @@ Advanced Projects
 
         def add_x_labels(self):
             x_labels = [
-                MathTex("\pi"), MathTex("2 \pi"),
-                MathTex("3 \pi"), MathTex("4 \pi"),
+                MathTex(r"\pi"), MathTex(r"2 \pi"),
+                MathTex(r"3 \pi"), MathTex(r"4 \pi"),
             ]
 
             for i in range(len(x_labels)):

manim/animation/fading.py

@@ -166,7 +166,7 @@ def construct(self):
                 dot = Dot(UP * 2 + LEFT)
                 self.add(dot)
                 tex = Tex(
-                    "FadeOut with ", "shift ", " or target\\_position", " and scale"
+                    "FadeOut with ", "shift ", r" or target\_position", " and scale"
                 ).scale(1)
                 animations = [
                     FadeOut(tex[0]),

manim/mobject/geometry/line.py

@@ -1068,7 +1068,7 @@ def construct(self):
 
                     angle = Angle(line1, line2, radius=0.4)
 
-                    value = DecimalNumber(angle.get_value(degrees=True), unit="^{\\circ}")
+                    value = DecimalNumber(angle.get_value(degrees=True), unit=r"^{\circ}")
                     value.next_to(angle, UR)
 
                     self.add(line1, line2, angle, value)

manim/mobject/matrix.py

@@ -15,8 +15,8 @@ def construct(self):
             m2 = DecimalMatrix(
                 [[3.456, 2.122], [33.2244, 12.33]],
                 element_to_mobject_config={"num_decimal_places": 2},
-                left_bracket="\\{",
-                right_bracket="\\}")
+                left_bracket=r"\{",
+                right_bracket=r"\}")
             m3 = MobjectMatrix(
                 [[Circle().scale(0.3), Square().scale(0.3)],
                 [MathTex("\\pi").scale(2), Star().scale(0.3)]],
@@ -294,7 +294,7 @@ def get_columns(self):
 
             class GetColumnsExample(Scene):
                 def construct(self):
-                    m0 = Matrix([["\\pi", 3], [1, 5]])
+                    m0 = Matrix([[r"\pi", 3], [1, 5]])
                     m0.add(SurroundingRectangle(m0.get_columns()[1]))
                     self.add(m0)
         """

manim/utils/docbuild/manim_directive.py

@@ -174,7 +174,7 @@ def run(self) -> list[nodes.Element]:
         # Rendering is skipped if the tag skip-manim is present,
         # or if we are making the pot-files
         should_skip = (
-            "skip-manim" in self.state.document.settings.env.app.builder.tags.tags
+            "skip-manim" in self.state.document.settings.env.app.builder.tags
             or self.state.document.settings.env.app.builder.name == "gettext"
         )
         if should_skip: