plot-input

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import TextBox
import random

fig, ax = plt.subplots(2,2,sharey=True)

plt.subplots_adjust(bottom=0.2)



n = 500
x = [random.random() for i in range(n)]
ax[0,0].hist(x,20)



def submit(text):
    try:
        n = int(text)
        if n <= 0:
            raise ValueError

    except ValueError:
        return


    x = [random.random() for i in range(n)]
    ax[0,0].clear()
    ax[0,0].hist(x,20)
    plt.draw()


axbox = plt.axes([0.1, 0.05, 0.8, 0.075])
text_box = TextBox(axbox, 'Длина', initial=str(n))
text_box.on_submit(submit)

plt.show()