从 csv 文件显示 plot

Question

我正在尝试 plot 来自 csv 文件的图表，我可以通过 gui 打开。 csv 文件具有多列和多行。 我为 plot 创建了 MyCanvas class，它链接到 ApplicationWindow class。 所有这些都在 Ttool.py 文件中。 为了获取文件并读取数据，我将文件 ttreadfile.py 导入到 Ttool.py 中。

我的问题是我不断收到错误消息：“self.toolbar = Navi(self.canv,self.main_widget) NameError: name 'self' is not defined”

此错误来自 ApplicationWindow class 下的 compute_initial_figure function。 我还将它连接到 MyCanvas class 以通过它（实际上不确定是否需要它？）我不知道出了什么问题以及为什么 compute_initial_figure 部分不起作用。

compute_initial_figure 应该清除之前在 plot 上绘制的所有数据，然后绘制当前上传的 csv 文件。

Ttool.py 文件：

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import warnings
warnings.simplefilter(action='ignore', category=FutureWarning)
from PyQt5 import QtCore, QtGui, QtWidgets
import matplotlib
import matplotlib.pyplot as plt
matplotlib.use('Qt5Agg')
from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import QFileDialog
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg, NavigationToolbar2QT as Navi
from matplotlib.figure import Figure
import pandas as pd
import sip
from datetime import datetime

#import of getFile and readData functions
from Module.ttreadfile import *

class MyCanvas(FigureCanvas):
    """set canvas plot."""
    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        # We want the axes cleared every time plot() is called
        self.axes.hold(False)

        self.compute_initial_figure()
        
        super(MyCanvas,self).__init__(fig)
        fig.tight_layout()

        
        FigureCanvas.__init__(self, fig)
        self.setParent(parent)

        FigureCanvas.setSizePolicy(self,
                QSizePolicy.Expanding,
                QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)

    def compute_initial_figure(self):
        pass


class ApplicationWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
        self.setWindowTitle("application main window")
        
        self.main_widget = QWidget(self)
        
        self.l = QGridLayout(self.main_widget)
        """create open button for window"""
        open_button =QPushButton('Open')
        open_button.clicked.connect(self.get_file)        
        
        """initialize the canvas, filename"""
        self.canv = MyCanvas(self)
        self.filename = ''
        self.df = []
        
        """create toolbar to control plot"""
        self.toolbar = Navi(self.canv,self.main_widget)
        
        """set layout of window"""
        self.l.addWidget(open_button, 0,0)
        self.l.addWidget(self.toolbar,0,1)
        self.l.addWidget(self.canv,1,0)
        
        self.main_widget.setFocus()
        self.setCentralWidget(self.main_widget)
        
    def get_file(self):
        """connects to the ttreadfile.py file and opens file"""
        getFile(self)

"""=============================================="""
#Here is where my code keeps breaking. I am not sure why the graph won't plot the data and why I keep getting an error

                        
    def compute_initial_figure(self):
        """graphs data to plot and clear old information from sys"""
        """would be nice to add function to ttreadfile but too complicated to connect toolbar and canv"""

        plt.clf()
        try:
            self.l.removeWidget(self.toolbar)
            self.l.removeWidget(self.canv)
            
            sip.delete(self.toolbar)
            sip.delete(self.canv)
            self.toolbar = None
            self.canv = None
        except Exception as e:
            print(e)
            pass
    
    #self.canv = MyCanvas(self)
    self.toolbar = Navi(self.canv,self.main_widget)
    
    self.l.addWidget(self.toolbar,0,1)
    self.l.addWidget(self.canv,1,0)
    
    self.canv.axes.cla()
    ax = self.canv.axes
    self.df.plot(ax = self.canv.axes)
    legend = ax.legend()
    legend.set_draggable(True)
    
    ax.set_xlabel('X axis')
    ax.set_ylabel('Y axis')
    ax.set_title(self.Title)
    
    self.canv.draw()

if __name__ == '__main__':
    app = QApplication(sys.argv)

    aw = ApplicationWindow()
    aw.setWindowTitle("PyQt5 Matplot Example")
    aw.show()
    #sys.exit(qApp.exec_())
    app.exec_()

ttreadfile.py

import sys
import random
import matplotlib
matplotlib.use("Qt5Agg")
from PyQt5 import QtCore
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import pandas as pd
from PIL import Image
import numpy as np
import re
from PyQt5.QtWidgets import QApplication, QMainWindow, QMenu, QVBoxLayout, QSizePolicy, QMessageBox, QWidget, QPushButton,QComboBox
from numpy import arange, sin, pi
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

#import to get access to compute_initial_figure from Ttool.py file
from Ttool import *

            
def getFile(instance):
    """this function will get the address of the csv file location and read data function"""
    #self.filename = ''
    try:
        instance.filename = QFileDialog.getOpenFileName(filter = "csv (*.csv)")[0]
        readData(instance)
    except Exception as e:
        print(e)
        pass
    
def readData(instance):
    """function will read data using pandas and call update function to plot"""
    #self.df = []
    
    instance.df = pd.read_csv(instance.filename,encoding = 'utf-8').fillna(0)
    updatePlot(instance)
    print("File:",instance.filename)

def updatePlot(instance):
    ApplicationWindow.compute_initial_figure