survey_graphics: Use raw strings to fix py3 deprecation warnings for unescaped escapes in strings

Author: mkoeppe

survey_graphics/graphics_for_computer_based_search.sage

@@ -32,18 +32,18 @@ def plotfig2():
     #h = piecewise_function_from_breakpoints_and_values([0,1/8,2/8,3/8,4/8,5/8,6/8,7/8,1],[0, 5/6, 2/6, 3/6, 4/6, 1/6, 6/6, 3/6, 0])
     #g = plot_with_colored_slopes(h)
     g = plot(h)
-    txfh = ['$\\frac{%s}{8}$' % x for x in range(9)];
-    tyfh = ['$\\frac{%s}{6}$' % x for x in range(7)];
-
-    g += text("$\pi_0$", (0/8,0/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='left')
-    g += text("$\pi_1$", (1/8, 5/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='center')
-    g += text("$\pi_2$", (2/8, 2/6), axis_coords=False, vertical_alignment='top',horizontal_alignment='center')
-    g += text("$\pi_3$", (3/8, 3/6), axis_coords=False, vertical_alignment='top',horizontal_alignment='left')
-    g += text("$\pi_4$", (4/8, 4/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='center')
-    g += text("$\pi_5$", (5/8, 1/6), axis_coords=False, vertical_alignment='top',horizontal_alignment='center')
-    g += text("$\pi_6$", (6/8, 6/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='center')
-    g += text("$\pi_7$", (7/8,3/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='left')
-    g += text("$\pi_8$", (8/8,0/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='left') 
+    txfh = [r'$\frac{%s}{8}$' % x for x in range(9)];
+    tyfh = [r'$\frac{%s}{6}$' % x for x in range(7)];
+
+    g += text(r"$\pi_0$", (0/8,0/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='left')
+    g += text(r"$\pi_1$", (1/8, 5/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='center')
+    g += text(r"$\pi_2$", (2/8, 2/6), axis_coords=False, vertical_alignment='top',horizontal_alignment='center')
+    g += text(r"$\pi_3$", (3/8, 3/6), axis_coords=False, vertical_alignment='top',horizontal_alignment='left')
+    g += text(r"$\pi_4$", (4/8, 4/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='center')
+    g += text(r"$\pi_5$", (5/8, 1/6), axis_coords=False, vertical_alignment='top',horizontal_alignment='center')
+    g += text(r"$\pi_6$", (6/8, 6/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='center')
+    g += text(r"$\pi_7$", (7/8,3/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='left')
+    g += text(r"$\pi_8$", (8/8,0/6), axis_coords=False, vertical_alignment='bottom',horizontal_alignment='left') 
 
     s2 = arrow((1/8,5/6),(1/8,2/6), width=1,arrowsize=2,color='black')+line([(1/8,2/6),(2/8,2/6)],color='black')+ text("$s_2$", (1/8,7/12), axis_coords=False, vertical_alignment='center',horizontal_alignment='left', color='black')
     s4 = arrow((3/8,3/6),(3/8,4/6), width=1,arrowsize=2,color='black')+line([(3/8,4/6),(4/8,4/6)],color='black')+ text("$s_4$", (3/8,7/12), axis_coords=False, vertical_alignment='center',horizontal_alignment='right', color='black')
@@ -81,7 +81,7 @@ def plotfig7():
      g = plot_2d_diagram(h, colorful = True)
      # not_extreme_1-2d_diagram.pdf is in survey_graphics
      # Don't save again.
-     # g.save(destdir+"not_extreme_1-2d_diagram.pdf", figsize=6, show_legend =False, ticks=[[x/10 for x in range(10)] ,[0,1]], tick_formatter=[["$\\frac{%s}{10}$" % x for x in range(10)], ["$%s$" % latex(x) for x in [0,1]]])
+     # g.save(destdir+"not_extreme_1-2d_diagram.pdf", figsize=6, show_legend =False, ticks=[[x/10 for x in range(10)] ,[0,1]], tick_formatter=[[r"$\frac{%s}{10}$" % x for x in range(10)], ["$%s$" % latex(x) for x in [0,1]]])
 
 def plotfig9():     
      h = kzh_5_slope_fulldim_1()
@@ -94,7 +94,7 @@ def plotfig11():
     q=58;
     h1 = kzh_6_slope_1()
     g1= plot_2d_diagram(h1, show_function=False, show_projections=False, known_minimal=True, f=None, colorful=True)
-    g1.save(destdir+"pattern_s6_q58.pdf", figsize=10, show_legend=False, ticks=[[0.001, (q-4)/6/q, (q-2)/4/q, 1/2, 1],[0,(q-4)/6/q, (q-2)/4/q, 1/2, 1]], tick_formatter=[["$0$","$\\frac{q-4}{6q}$", "$\\frac{q-2}{4q}$", "$\\frac{1}{2}$","$1$"], ["$0$","$\\frac{q-4}{6q}$","$\\frac{q-2}{4q}$", "$\\frac{1}{2}$","$1$"]], fontsize=20, gridlines=False)
+    g1.save(destdir+"pattern_s6_q58.pdf", figsize=10, show_legend=False, ticks=[[0.001, (q-4)/6/q, (q-2)/4/q, 1/2, 1],[0,(q-4)/6/q, (q-2)/4/q, 1/2, 1]], tick_formatter=[["$0$",r"$\frac{q-4}{6q}$", r"$\frac{q-2}{4q}$", r"$\frac{1}{2}$","$1$"], ["$0$",r"$\frac{q-4}{6q}$",r"$\frac{q-2}{4q}$", r"$\frac{1}{2}$","$1$"]], fontsize=20, gridlines=False)
 
 
     q=166;
@@ -105,7 +105,7 @@ def plotfig11():
 
     c2=polygon([(21/q, 31/q),(31/q, 31/q),(31/q, 21/q)], color='black', fill=False, thickness=2, zorder=5)+polygon([(29/q, 29/q),(29/q, 34/q),(34/q, 34/q),(34/q, 29/q)], color='black', fill=False, thickness=2,zorder=5)+polygon([(32/q, 32/q),(32/q, 37/q),(37/q, 37/q),(37/q, 32/q)], color='black', fill=False, thickness=2, zorder=5)+polygon([(35/q, 35/q),(35/q, 40/q),(40/q, 40/q),(40/q, 35/q)], color='black', fill=False, thickness=2, zorder=5)+polygon([(15/q, 34/q),(20/q, 34/q),(25/q, 29/q),(20/q, 29/q)], color='black', fill=False, thickness=2, zorder=5)+polygon([(9/q, 37/q),(14/q, 37/q),(19/q, 32/q),(14/q, 32/q)], color='black', fill=False, thickness=2, zorder=5)+polygon([(3/q, 40/q),(8/q, 40/q),(13/q, 35/q),(8/q, 35/q)], color='black', fill=False, thickness=2, zorder=5)+polygon([(34/q, 15/q),(34/q, 20/q),(29/q, 25/q),(29/q, 20/q)], color='black', fill=False, thickness=2, zorder=5)+polygon([(37/q, 9/q),(37/q, 14/q),(32/q, 19/q),(32/q, 14/q)], color='black', fill=False, thickness=2, zorder=5)+polygon([(40/q, 3/q),(40/q, 8/q),(35/q, 13/q),(35/q, 8/q)], color='black', fill=False, thickness=2, zorder=5);
 
-    (g4+c2).save(destdir+"pattern_s10_q166.pdf", figsize=10, show_legend=False, ticks=[[0.001, (q-4)/6/q, (q-2)/4/q, 1/2, 1],[0,(q-4)/6/q, (q-2)/4/q, 1/2, 1]], tick_formatter=[["$0$","$\\frac{q-4}{6q}$", "$\\frac{q-2}{4q}$", "$\\frac{1}{2}$","$1$"], ["$0$","$\\frac{q-4}{6q}$","$\\frac{q-2}{4q}$", "$\\frac{1}{2}$","$1$"]], fontsize=20, gridlines=False, xmin=0, xmax=0.25, ymin=0, ymax=0.25)
+    (g4+c2).save(destdir+"pattern_s10_q166.pdf", figsize=10, show_legend=False, ticks=[[0.001, (q-4)/6/q, (q-2)/4/q, 1/2, 1],[0,(q-4)/6/q, (q-2)/4/q, 1/2, 1]], tick_formatter=[["$0$",r"$\frac{q-4}{6q}$", r"$\frac{q-2}{4q}$", r"$\frac{1}{2}$","$1$"], ["$0$",r"$\frac{q-4}{6q}$",r"$\frac{q-2}{4q}$", r"$\frac{1}{2}$","$1$"]], fontsize=20, gridlines=False, xmin=0, xmax=0.25, ymin=0, ymax=0.25)
 
 
 ### MAIN ###

survey_graphics/graphics_for_crazy_perturbation.sage

@@ -425,9 +425,9 @@ g += line([(x1, y2), (x2, y1)], color='black', linestyle=':') + line([(x1, y3),
 g += line([(0, y1), (x2, y1)], color='black', linestyle=':')+line([(0, y2), (x2, y2)], color='black', linestyle=':')+line([(0, y3), (x2, y3)], color='black', linestyle=':')+line([(0, yn1), (x2, yn1)], color='black', linestyle=':')+line([(0, yn), (x2, yn)], color='black', linestyle=':')+line([(x1, 0), (x1, yn)], color='black', linestyle=':')+line([(x2, 0), (x2, yn)], color='black', linestyle=':')
 g += point([(u,v),(x1,y2),(x2,y1),(x1,y3),(x2,y2),(x1,yn),(x2,yn1)], color='black',size=30,zorder=10)
 ticks = [[u, x1, x2, u+delta, u+eta], [v, y1, y2, y3, yn1, yn, v+eta]]
-tick_formatter = [["$u$", "$x$", "$x'$", "", "$u+\eta$"],["$v$","$y_1$","$y_2$","$y_3$","$y_{N-1}$","$y_N$","$v+\eta$"]]
+tick_formatter = [["$u$", "$x$", "$x'$", "", r"$u+\eta$"],["$v$","$y_1$","$y_2$","$y_3$","$y_{N-1}$","$y_N$",r"$v+\eta$"]]
 g += text("$(u,v)$", (u-0.01,v-0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='right',color='black',fontsize=20)
-g += text("$u+\delta$", (u+delta, -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='left',color='black',fontsize=20)
+g += text(r"$u+\delta$", (u+delta, -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='left',color='black',fontsize=20)
 g.fontsize(20)
 g.show(ticks=ticks, tick_formatter=tick_formatter)
 g.save(destdir + "proof_uniform_cont_case_1.png", ticks=ticks, tick_formatter=tick_formatter)
@@ -449,10 +449,10 @@ g += line([(x1, y2), (x2, y1)], color='black', linestyle=':') + line([(x1, y3),
 g += line([(0, y1), (x2, y1)], color='black', linestyle=':')+line([(0, y2), (x2, y2)], color='black', linestyle=':')+line([(0, y3), (x2, y3)], color='black', linestyle=':')+line([(0, yn1), (x2, yn1)], color='black', linestyle=':')+line([(0, yn), (x2, yn)], color='black', linestyle=':')+line([(x1, 0), (x1, yn)], color='black', linestyle=':')+line([(x2, 0), (x2, yn)], color='black', linestyle=':')
 g += point([(u,v),(x1,y2),(x2,y1),(x1,y3),(x2,y2),(x1,yn),(x2,yn1)], color='black',size=30,zorder=10)
 ticks = [[u, x1, x2, u-delta, u-eta, u+delta, u+eta], [v, y1, y2, y3, yn1, yn, v+eta]]
-tick_formatter = [["$u$", "$x$", "", "", "$u-\eta$", "", "$u+\eta$"],["$v$","$y_1$","$y_2$","$y_3$","$y_{N-1}$","$y_N$","$v+\eta$"]]
+tick_formatter = [["$u$", "$x$", "", "", r"$u-\eta$", "", r"$u+\eta$"],["$v$","$y_1$","$y_2$","$y_3$","$y_{N-1}$","$y_N$",r"$v+\eta$"]]
 g += text("$(u,v)$", (u-0.02,v), axis_coords=False, vertical_alignment='center', horizontal_alignment='right',color='black',fontsize=20)
-g += text("$u-\delta$", (u-delta, -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='right',color='black',fontsize=20)
-g += text("$u+\delta$", (u+delta, -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='left',color='black',fontsize=20)
+g += text(r"$u-\delta$", (u-delta, -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='right',color='black',fontsize=20)
+g += text(r"$u+\delta$", (u+delta, -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='left',color='black',fontsize=20)
 g += text("$x'$", (x2, -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='left',color='black',fontsize=20)
 g.fontsize(20)
 g.show(ticks=ticks, tick_formatter=tick_formatter)
@@ -475,10 +475,10 @@ g += line([(x1, y2), (x2, y1)], color='black', linestyle=':') + line([(x1, y3),
 g += line([(0, y1), (x2, y1)], color='black', linestyle=':')+line([(0, y2), (x2, y2)], color='black', linestyle=':')+line([(0, y3), (x2, y3)], color='black', linestyle=':')+line([(0, yn1), (x2, yn1)], color='black', linestyle=':')+line([(0, yn), (x2, yn)], color='black', linestyle=':')+line([(x1, 0), (x1, yn)], color='black', linestyle=':')+line([(x2, 0), (x2, yn)], color='black', linestyle=':')
 g += point([(u,v),(x1,y2),(x2,y1),(x1,y3),(x2,y2),(x1,yn),(x2,yn1)], color='black',size=30,zorder=10)
 ticks = [[u, x1, x2, u-delta, u-eta], [v, y1, y2, y3, yn1, yn, v+eta]]
-tick_formatter = [["$u$", "$x$", "$x'$", "", "$u-\eta$"],["$v$","$y_1$","$y_2$","$y_3$","$y_{N-1}$","$y_N$","$v+\eta$"]]
+tick_formatter = [["$u$", "$x$", "$x'$", "", r"$u-\eta$"],["$v$","$y_1$","$y_2$","$y_3$","$y_{N-1}$","$y_N$",r"$v+\eta$"]]
 #g += text("$v$", (-0.01,v), axis_coords=False, vertical_alignment='center', horizontal_alignment='right',color='black',fontsize=20)
 g += text("$(u,v)$", (u,v), axis_coords=False, vertical_alignment='top', horizontal_alignment='left',color='black',fontsize=20)
-g += text("$u-\delta$", (u-delta, -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='right',color='black',fontsize=20)
+g += text(r"$u-\delta$", (u-delta, -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='right',color='black',fontsize=20)
 g.fontsize(20)
 g.show(ticks=ticks, tick_formatter=tick_formatter)
 g.save(destdir + "proof_uniform_cont_case_3.png", ticks=ticks, tick_formatter=tick_formatter)
@@ -505,7 +505,7 @@ g += line([(0, y1), (x1, y1)], color='black', linestyle=':')+line([(0, y2), (x2,
 g += point([(u,v),(x1,y1),(x2,y2)], color='black',size=30,zorder=10)
 g += text("$(u,v)$", (u-0.02,v), axis_coords=False, vertical_alignment='center', horizontal_alignment='right',color='black',fontsize=20)
 ticks = [[u, x1, x2, u-delta, u+delta], [v, y1, y2, v+delta]]
-tick_formatter = [["$u$", "$x$", "$x'$", "$u-\delta$", "$u+\delta$"],["$v$","$y$","$y'$","$v+\delta$"]]
+tick_formatter = [["$u$", "$x$", "$x'$", r"$u-\delta$", r"$u+\delta$"],["$v$","$y$","$y'$",r"$v+\delta$"]]
 g.fontsize(20)
 g.show(ticks=ticks, tick_formatter=tick_formatter)
 g.save(destdir + "proof_uniform_V_case12.png", ticks=ticks, tick_formatter=tick_formatter)
@@ -522,7 +522,7 @@ g += line([(x1, y1), (x2, y2)], color='black', linestyle=':')
 g += line([(0, y1), (u, y1)], color='black', linestyle=':')+line([(0, y2), (x2, y2)], color='black', linestyle=':')+line([(x1, 0), (x1, y1)], color='black', linestyle=':')+line([(x2, 0), (x2, y2)], color='black', linestyle=':')
 g += point([(u,v),(x1,y1),(x2,y2)], color='black',size=30,zorder=10)
 ticks = [[u, x1, x2, u-delta], [v, y1, y2, v+delta]]
-tick_formatter = [["$u$", "$x$", "$x'$","$u-\delta$"],["$v$","$y$","$y'$","$v+\delta$"]]
+tick_formatter = [["$u$", "$x$", "$x'$",r"$u-\delta$"],["$v$","$y$","$y'$",r"$v+\delta$"]]
 g += text("$(u,v)$", (u,v), axis_coords=False, vertical_alignment='top', horizontal_alignment='left',color='black',fontsize=20)
 g += text("=",(u-t1/4,v+t1+0.01), rotation="vertical", axis_coords=False, vertical_alignment='center', horizontal_alignment='center',color='blue', fontsize=15)+text("=",(u-t1*3/4,v+t1+0.01), rotation="vertical",axis_coords=False, vertical_alignment='center', horizontal_alignment='center',color='blue', fontsize=15)
 g.fontsize(20)
@@ -542,11 +542,11 @@ g += line([(u,v), (u-eta, v+eta)], color='black')+line([(u,v), (u+eta, v)], colo
 g += line([(u, y), (x2, y)], color='black', linestyle=':')
 g += line([(u, v), (u+v, 0)], color='black', linestyle=':')+line([(u, v+t1), (z1, 0)], color='black', linestyle=':')+line([(x2, y), (z2, 0)], color='black', linestyle=':')+line([(u+delta, v), (u+v+delta, 0)], color='black', linestyle=':')
 g += point([(u,v),(x1,y),(x2,y)], color='black',size=30,zorder=10) #(u+delta,v),(u, v+delta)
-g += text("$(u,v)$", (u-0.02,v), axis_coords=False, vertical_alignment='center', horizontal_alignment='right',color='black',fontsize=20)+text("$(u+\delta,v)$", (u+delta+0.02,v), axis_coords=False, vertical_alignment='center', horizontal_alignment='left',color='black',fontsize=20)+text("$(u,v+\delta)$", (u,v+delta+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='center',color='black',fontsize=20)+text("$(x,y)$", (x1+0.02,y+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='left',color='black',fontsize=20)+text("$(x',y)$", (x2+0.02,y+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='left',color='black',fontsize=20)
+g += text("$(u,v)$", (u-0.02,v), axis_coords=False, vertical_alignment='center', horizontal_alignment='right',color='black',fontsize=20)+text(r"$(u+\delta,v)$", (u+delta+0.02,v), axis_coords=False, vertical_alignment='center', horizontal_alignment='left',color='black',fontsize=20)+text(r"$(u,v+\delta)$", (u,v+delta+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='center',color='black',fontsize=20)+text(r"$(x,y)$", (x1+0.02,y+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='left',color='black',fontsize=20)+text("$(x',y)$", (x2+0.02,y+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='left',color='black',fontsize=20)
 g += arrow((0.3,0), (u+v+delta+0.4,0), color='black',width=1)
 zticks = [u+v, z1, z2, u+v+delta+0.05]
 zlocs = [u+v, z1, z2, u+v+delta]
-ztick_formatter = ["$u+v$", "$z$", "$z'$", "$u+v+\delta$"]
+ztick_formatter = ["$u+v$", "$z$", "$z'$", r"$u+v+\delta$"]
 for i in range(4):
     g += text(ztick_formatter[i], (zticks[i], -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='center',color='black',fontsize=20)
     g += line([(zlocs[i],0),(zlocs[i],0.03)],color='black',thickness=0.5)
@@ -570,11 +570,11 @@ g += line([(u, y), (0, y)], color='black', linestyle=':')
 g += line([(u, v), (u+v, 0)], color='black', linestyle=':')+line([(x1, y), (z1, 0)], color='black', linestyle=':')+line([(x2, y), (z2, 0)], color='black', linestyle=':')+line([(u, y), (u+v+delta, 0)], color='black', linestyle=':')
 g += point([(u,v),(x1,y),(x2,y)], color='black',size=30,zorder=10) #(u+delta,v),(u, v+delta)
 g += text("$(u,v)$", (u-0.02,v), axis_coords=False, vertical_alignment='center', horizontal_alignment='right',color='black',fontsize=20)+text("$(x,y)$", (x1,y+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='center',color='black',fontsize=20)+text("$(x',y)$", (x2,y+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='center',color='black',fontsize=20)
-g += text("$y=v+\delta$", (u+0.02,v+delta), axis_coords=False, vertical_alignment='center', horizontal_alignment='left',color='black',fontsize=20)
+g += text(r"$y=v+\delta$", (u+0.02,v+delta), axis_coords=False, vertical_alignment='center', horizontal_alignment='left',color='black',fontsize=20)
 g += arrow((0.3,0), (u+v+delta+0.4,0), color='black',width=1)
 zticks = [u+v, z1, z2, u+v+delta+0.05]
 zlocs = [u+v, z1, z2, u+v+delta]
-ztick_formatter = ["$u+v$", "$z$", "$z'$", "$u+v+\delta$"]
+ztick_formatter = ["$u+v$", "$z$", "$z'$", r"$u+v+\delta$"]
 for i in range(4):
     g += text(ztick_formatter[i], (zticks[i], -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='center',color='black',fontsize=20)
     g += line([(zlocs[i],0),(zlocs[i],0.03)],color='black',thickness=0.5)
@@ -596,11 +596,11 @@ g += line([(u-delta, y), (u, y)], color='black', linestyle=':')
 g += line([(u, v), (u+v, 0)], color='black', linestyle=':')+line([(x1, y), (z1, 0)], color='black', linestyle=':')+line([(x2, y), (z2, 0)], color='black', linestyle=':')+line([(u, y), (u+y, 0)], color='black', linestyle=':')+line([(u-delta, y), (u-delta+y, 0)], color='black', linestyle=':')
 g += point([(u,v),(x1,y),(x2,y)], color='black',size=30,zorder=10) #(u+delta,v),(u, v+delta)
 g += text("$(u,v)$", (u+0.02,v), axis_coords=False, vertical_alignment='center', horizontal_alignment='left',color='black',fontsize=20)+text("$(x,y)$", (x1,y+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='center',color='black',fontsize=20)+text("$(x',y)$", (x2,y+0.02), axis_coords=False, vertical_alignment='bottom', horizontal_alignment='center',color='black',fontsize=20)
-g += text("$y=v+\\frac{\delta}{2}$", (u+0.02,y), axis_coords=False, vertical_alignment='center', horizontal_alignment='left',color='black',fontsize=20)
+g += text(r"$y=v+\frac{\delta}{2}$", (u+0.02,y), axis_coords=False, vertical_alignment='center', horizontal_alignment='left',color='black',fontsize=20)
 g += arrow((0.3,0), (u+y+0.4,0), color='black',width=1)
 zticks = [u+y-delta-0.05,u+v, z1, z2, u+y+0.05]
 zlocs = [u+y-delta, u+v, z1, z2, u+y]
-ztick_formatter = ["$u+v-\\frac{\delta}{2}$", "$u+v$", "$z$", "$z'$", "$u+v+\\frac{\delta}{2}$"]
+ztick_formatter = [r"$u+v-\frac{\delta}{2}$", "$u+v$", "$z$", "$z'$", r"$u+v+\frac{\delta}{2}$"]
 for i in range(5):
     g += text(ztick_formatter[i], (zticks[i], -0.01), axis_coords=False, vertical_alignment='top', horizontal_alignment='center',color='black',fontsize=20)
     g += line([(zlocs[i],0),(zlocs[i],0.03)],color='black',thickness=0.5)