import math
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow, QAction, QVBoxLayout, QHBoxLayout, QLabel, QLineEdit, QSpacerItem, QSizePolicy, QPushButton
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import QSize
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.pyplot as plt
import mplcyberpunk
import random
plt.style.use("cyberpunk")
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
import numpy as np
class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.title = 'Moja appka'
        self.left = 10
        self.top = 10
        self.width = 1920
        self.height = 1080
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        self.statusBar().showMessage('Ready')
        mainMenu = self.menuBar()
        mainMenu.setNativeMenuBar(False)
        fileMenu = mainMenu.addMenu('Plik')
        helpMenu = mainMenu.addMenu('Pomoc')
        self.move(150,150)
        exitButton = QAction(QIcon('exit24.png'), 'Exit', self)
        exitButton.setShortcut('Ctrl+Q')
        exitButton.setStatusTip('Wyjsc z programu')
        exitButton.triggered.connect(self.close)
        fileMenu.addAction(exitButton)
        widget =  QWidget(self)
        self.setCentralWidget(widget)
        vlay = QVBoxLayout(widget)
        hlay = QHBoxLayout()
        vlay.addLayout(hlay)
        self.nameLabel = QLabel('Nazwa:', self)
        self.line = QLineEdit(self)
        self.nameLabel2 = QLabel('Wynik', self)
        hlay.addWidget(self.nameLabel)
        hlay.addWidget(self.line)
        hlay.addWidget(self.nameLabel2)
        hlay.addItem(QSpacerItem(1000, 10, QSizePolicy.Expanding))
        pybutton = QPushButton('Wcisnij mnie:)', self)
        pybutton.clicked.connect(self.clickMethod)
        hlay2 = QHBoxLayout()
        hlay2.addWidget(pybutton)
        hlay2.addItem(QSpacerItem(1000, 10, QSizePolicy.Expanding))
        vlay.addLayout(hlay2)
        m = WidgetPlot(self)
        vlay.addWidget(m)
    def clickMethod(self):#вот здесь я и хочу это все мероприятие обрабатывать
        print('Clicked Pyqt button.')
        if self.line.text() == 'sin(1)':
            self.statusBar().showMessage('Not a Number')
   
        else:
            print('Number: {}'.format(float(self.line.text())*2))
            self.statusBar().showMessage('Introduction of a number')
            self.nameLabel2.setText(str(float(self.line.text())*2))
class WidgetPlot(QWidget):
    def __init__(self, *args, **kwargs):
        QWidget.__init__(self, *args, **kwargs)
        self.setLayout(QVBoxLayout())
        self.canvas = PlotCanvas(self, width=10, height=8)
        self.toolbar = NavigationToolbar(self.canvas, self)
        self.layout().addWidget(self.toolbar)
        #self.toolbar.configure_subplots()
        self.layout().addWidget(self.canvas)
class PlotCanvas(FigureCanvas):
    def __init__(self, parent=None, width=10, height=8, dpi=150):
        fig = Figure(figsize=(width, height), dpi=dpi)
        FigureCanvas.__init__(self, fig)
        self.setParent(parent)
        FigureCanvas.setSizePolicy(self, QSizePolicy.Expanding, QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)
        self.plot()
    def plot(self):
        ax = self.figure.add_subplot(111)
        ax.set_title('Joanna Bihun',fontsize=14)
        ax.spines['left'].set_position('center')
        ax.spines['bottom'].set_position('center')
        ax.spines['right'].set_color('none')
        ax.spines['top'].set_color('none')
        ax.xaxis.set_ticks_position('bottom')
        ax.yaxis.set_ticks_position('left')
        x = np.arange(0, 10, 0.1)
        y = np.sin(x)
        z = np.cos(x)
        ax.plot(x, np.sin(y), '-', label='Sin(x)')
        ax.plot(x, np.cos(z), '-', label='Cos(x)')
        ax.legend(framealpha=1, fontsize=13, frameon=True);
        mplcyberpunk.make_lines_glow(ax)
        mplcyberpunk.add_underglow(ax)
        plt.style.use("dark_background")
        #mplcyberpunk.add_glow_effects(ax)
        self.draw()
if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainWin = MainWindow()
    mainWin.show()
    sys.exit( app.exec_())

 if self.line.text() == 'sin(1)':
рисуем синус sin(1)