问Matplotlib日志刻度滴答标签，在乳胶字体中减号太长

EN

import matplotlib.ticker
import matplotlib
import re

# create a definition for the short hyphen
matplotlib.rcParams["text.latex.preamble"].append(r'\mathchardef\mhyphen="2D')

class MyLogFormatter(matplotlib.ticker.LogFormatterMathtext):
    def __call__(self, x, pos=None):
        # call the original LogFormatter
        rv = matplotlib.ticker.LogFormatterMathtext.__call__(self, x, pos)

        # check if we really use TeX
        if matplotlib.rcParams["text.usetex"]:
            # if we have the string ^{- there is a negative exponent
            # where the minus sign is replaced by the short hyphen
            rv = re.sub(r'\^\{-', r'^{\mhyphen', rv)

        return rv

import matplotlib.pyplot as plt
import numpy as np

matplotlib.rcParams["text.usetex"] = True
fig = plt.figure()
ax = fig.add_subplot(111)
ax.semilogy(np.linspace(0,5,200), np.exp(np.linspace(-2,3,200)*np.log(10)))
ax.yaxis.set_major_formatter(MyLogFormatter())
fig.savefig("/tmp/shorthyphen.png")

import numpy as np
import matplotlib.pyplot as plt
import matplotlib as mpl
from matplotlib import ticker


mpl.rcParams['text.usetex']=True
mpl.rcParams['text.latex.unicode']=True

def my_formatter_fun(x, p):
    """ Own formatting function """
    return r"$10$\textsuperscript{%i}" % np.log10(x)  #  raw string to avoid "\\"


x = np.linspace(1e-6,1,1000)
y = x**2

fg = plt.figure(1); fg.clf()
ax = fg.add_subplot(1, 1, 1)
ax.semilogx(x, x**2)
ax.set_title("$10^{-3}$ versus $10$\\textsuperscript{-3} versus "
             "10\\textsuperscript{-3}")
# Use own formatter:
ax.get_xaxis().set_major_formatter(ticker.FuncFormatter(my_formatter_fun))

fg.canvas.draw()
plt.show()