Question

我的代码发生了奇怪的事情，我正在学习如何使用matplotlib创建图，并且我有以下示例：

import matplotlib
matplotlib.use('Qt5Agg')
import matplotlib.pyplot as plt
import datetime as dt
import numpy as np
import matplotlib.dates as md
from matplotlib.widgets import Button


def graph():

    #x = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,19,19,19,19]
    #xm =[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,12,21,38,47,55]
    x = [dt.datetime(2018, 7, 7, 17, 59), dt.datetime(2018, 7, 7, 18, 4), dt.datetime(2018, 7, 7, 19, 9),
    dt.datetime(2018, 7, 7, 19, 14), dt.datetime(2018, 7, 7, 20, 19), dt.datetime(2018, 7, 7, 20, 24),
    dt.datetime(2018, 7, 7, 20, 29), dt.datetime(2018, 7, 7, 21, 34), dt.datetime(2018, 7, 7, 21, 39),
    dt.datetime(2018, 7, 7, 22, 44)]
    y = [72,68,145,156,184,160,210,230,215,222]
    highest = max(y)
    lowest = min(y)
    #datetimes = [datetime.time.strptime(t, "%H:%M") for t in x]
    #datetimes = []
    #s = 0
    #for t in x:
    #    datetimes.append(datetime.time(t,xm[s]).isoformat(timespec='minutes'))
    #    s += 1
    #plt.axhline(lowest, color='c', linestyle='--', label='Last 24h min Comsumption')
    #plt.text(24.4, lowest, str(lowest), va='center', ha="left", bbox=dict(facecolor="w",alpha=0.5))
    #plt.axhline(highest, color='r', linestyle='--', label='Last 24h max Comsumption')
    #plt.text(24.4, highest, str(highest), va='center', ha="left", bbox=dict(facecolor="w",alpha=0.5))
    xlen = len(x)
    lastdate = xlen - 1
    deltah = dt.timedelta(minutes = 17)
    figfuel, ax = plt.subplots()
    ax.plot(x,y, label ='Cb-Ft per hour')
    ax.axhline(highest, color='r', linestyle='--', label='Last 24h max Comsumption')
    ax.text(x[lastdate] + deltah, highest, str(highest), va='center', ha="left", bbox=dict(facecolor="w",alpha=0.5))
    ax.axhline(lowest, color='c', linestyle='--', label='Last 24h min Comsumption')
    ax.text(x[lastdate] + deltah, lowest, str(lowest), va='center', ha="left", bbox=dict(facecolor="w",alpha=0.5))
    #plt.plot(x,y, label='Cb-Ft per hour')
    #plt.connect('button_press_event', efecto)

    plt.subplots_adjust(bottom=0.2)
    plt.ylabel('Fuel Comsumption (Cb-ft per hour)')
    plt.title('Fuel Comsumption Chart')
    plt.grid(True)
    plt.legend()
    plt.xticks(rotation=90)
    figManager = plt.get_current_fig_manager()
    figManager.window.showMaximized()
    xformatter = md.DateFormatter('%H:%M')
    xlocator = md.MinuteLocator(byminute=[0,60], interval = 1)
    ax.xaxis.set_major_locator(xlocator)
    plt.gcf().axes[0].xaxis.set_major_formatter(xformatter)
    #axcut = plt.axes([0.7, 0.05, 0.1, 0.075])
    axcut = plt.axes([0.885, 0.015, 0.1, 0.075])
    bcut = Button(axcut, 'Close')
    bcut.on_clicked(efecto)
    plt.show()

def efecto(event):
    plt.close()

正如您所看到的，我注释了很多行，因为当时我正在测试，graph（）函数由另一个外部脚本调用，所以问题出在下面，在第二行，您可以看到我设置了后端是Qt5Agg，因此当我执行该操作时，在文件末尾创建的按钮停止工作，它什么也不做，当鼠标指针悬停在它上面时不突出显示，并且单击它时什么也没有发生。但是，如果我注释了matplotlib.use行，则脚本将使用默认脚本（TkAgg），然后该按钮将正常工作，如果将鼠标指针放在其上，它将更改颜色，如果单击该按钮，情节变得封闭，所以我在做错什么？，我试图读取有关后端的差异，但没有发现与按钮相关的任何内容。

使用Qt5后端Matplotlib时按钮不起作用

0 个答案: