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Some way to make them go is:

from matplotlib import rcParams
rcParams['xtick.major.size'] = rcParams['xtick.minor.size'] = 0
rcParams['ytick.major.size'] = rcParams['ytick.minor.size'] = 0
a,b,c,x,y = var('a b c x y')
from matplotlib import spines, axes
i = 2
p = region_plot(
    tan(x^2 - y^2)>0,
    (-i*pi,+i*pi), (-i*pi,+i*pi),linewidths=0,
    incol='yellow',outcol='white',plot_points=500,fontsize=16)
p

Some way to make them go is:

from matplotlib import rcParams
rcParams['xtick.major.size'] = rcParams['xtick.minor.size'] = 0
rcParams['ytick.major.size'] = rcParams['ytick.minor.size'] = 0
a,b,c,x,y = var('a b c x y')
from matplotlib import spines, axes
i = 2
p = region_plot(
    tan(x^2 - y^2)>0,
    (-i*pi,+i*pi), (-i*pi,+i*pi),linewidths=0,
    incol='yellow',outcol='white',plot_points=500,fontsize=16)
p

Some way to make them go is:

from matplotlib import rcParams
rcParams['xtick.major.size'] = rcParams['xtick.minor.size'] = 0
rcParams['ytick.major.size'] = rcParams['ytick.minor.size'] = 0
a,b,c,x,y = var('a b c x y')
i = 2
p = region_plot(
    tan(x^2 - y^2)>0,
    (-i*pi,+i*pi), (-i*pi,+i*pi),linewidths=0,
    incol='yellow',outcol='white',plot_points=500,fontsize=16)
incol='yellow',outcol='white',plot_points=500,fontsize=16,
    ticks=[pi/2,pi/2],tick_formatter=[pi,pi])
p

Some way to make them go is:

from matplotlib import rcParams
rcParams['xtick.major.size'] = rcParams['xtick.minor.size'] = 0
rcParams['ytick.major.size'] = rcParams['ytick.minor.size'] = 0
a,b,c,x,y = var('a b c x y')
i = 2
p = region_plot(
    tan(x^2 - y^2)>0,
    (-i*pi,+i*pi), (-i*pi,+i*pi),linewidths=0,
    incol='yellow',outcol='white',plot_points=500,fontsize=16,
    ticks=[pi/2,pi/2],tick_formatter=[pi,pi])
p

a,b,c,x,y = var('a b c x y')
i = 2
p = contour_plot(
    tan(x^2 - y^2),
    (-i*pi,+i*pi), (-i*pi,+i*pi),linewidths=0,
    contours=[0,0.001],cmap='coolwarm',   
    plot_points=500,fontsize=16,
    ticks=[pi/2,pi/2],tick_formatter=[pi,pi])
p

Some way to make them go is:

from matplotlib import rcParams
rcParams['xtick.major.size'] = rcParams['xtick.minor.size'] = 0
rcParams['ytick.major.size'] = rcParams['ytick.minor.size'] = 0
a,b,c,x,y = var('a b c x y')
i = 2
p = region_plot(
    tan(x^2 - y^2)>0,
    (-i*pi,+i*pi), (-i*pi,+i*pi),linewidths=0,
    incol='yellow',outcol='white',plot_points=500,fontsize=16,
    ticks=[pi/2,pi/2],tick_formatter=[pi,pi])
p

If you need the ticks outside, you can try:

p.show(frame=True,axes=False)

or

a,b,c,x,y = var('a b c x y')
i = 2
p = contour_plot(
    tan(x^2 - y^2),
    (-i*pi,+i*pi), (-i*pi,+i*pi),linewidths=0,
    contours=[0,0.001],cmap='coolwarm',   
    plot_points=500,fontsize=16,
    ticks=[pi/2,pi/2],tick_formatter=[pi,pi])
p