如何使用matplotlib在图形X轴上绘制分数值？

Question

I have the following array:

np.array([0,1/3.,2/3.,1])

I want to write this values in the fraction form in a graph x-axis using matplotlib, anyone knows how to do it?

for example:

from matplotlib import pyplot as plt

X = np.array([0,1/3.,2/3.,1])
Y = 2*X
plt.xticks(np.unique(X))
plt.plot(X,Y)

Answer 1

I don't know if it is the best solution, but it works for me:

from matplotlib import pyplot as plt
from fractions import Fraction

X = np.array([0,1/3.,2/3.,1])
Y = 2*X
X_tick = np.array([])
for item in X:
    X_tick = np.append(X_tick,Fraction(item).limit_denominator())
plt.xticks(np.unique(X),X_tick)
plt.plot(X,Y)

Answer 2

A slightly cleaner version of the answer by @dalmeida13 using a list comprehension:

from matplotlib import pyplot as plt
from fractions import Fraction
import numpy as np

X = np.array([0,1/3.,2/3.,1])
Y = 2*X

X_tick = [Fraction(item).limit_denominator() for item in X]
plt.xticks(np.unique(X), X_tick)
plt.plot(X,Y)
plt.show()

which results in the same outcome.