Python Treeview delete rows

from tkinter import *
from tkinter import ttk

class Application(Frame):
    
    def __init__(self, master):
        """ Initialize the Frame"""
        ttk.Frame.__init__(self, master)
 
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        self.btnConnect = ttk.Button(self, text = "Search Symbol", command=self.search_symbol).grid(row=0, column=0, sticky=W)
        self.btnDisconnect = ttk.Button(self, text = "Add data", command=self.add_data).grid(row=0, column=1, sticky=W)
        self.btnCancelMktData = ttk.Button(self, text = 'Remove All', command=self.remove_all).grid(row=0, column=2, sticky=W)
        self.button_edit = Button(self, font=('',12), text="select row", width=7, command=self.add_data)
        self.button_edit.grid(row=0, column=4)
        
        # create Treeview widget to hold values in a table
        self.tv = ttk.Treeview(root)    

        # create Treeview 
        self.tv = ttk.Treeview(self,  height=8)
        self.tv['columns'] = ('id', 'symbol', 'price', 'trigger', 'shares', 'side', 'type', 'status', 'fill')
        self.tv.heading("#0", text='Time', anchor='w')
        self.tv.column("#0", stretch=NO, width=5, anchor="w")
        self.tv.heading('id', text='ID')
        self.tv.column('id', anchor='center', width=70)
        self.tv.heading('symbol', text='Symbol')
        self.tv.column('symbol', anchor='center', width=70)
        self.tv.heading('price', text='Price')
        self.tv.column('price', anchor='center', width=70)
        self.tv.heading('trigger', text='Trigger')
        self.tv.column('trigger', anchor='center', width=70)
        self.tv.heading('shares', text='Shares')
        self.tv.column('shares', anchor='center', width=100)
        self.tv.heading('side', text='Side')
        self.tv.column('side', anchor='center', width=70)
        self.tv.heading('type', text='Type')
        self.tv.column('type', anchor='center', width=70)
        self.tv.heading('status', text='Status')
        self.tv.column('status', anchor='center', width=100)
        self.tv.heading('fill', text='Fill')
        self.tv.column('fill', anchor='center', width=70)
        self.tv.bind('<ButtonRelease-1>', self.select_item) 
        self.tv.grid(row=1, column=0, columnspan=6, padx=5, pady=5)
        self.treeview = self.tv
##        self.ysb = ttk.Scrollbar(self, orient='vertical', command=self.tv.yview)
##        self.xsb = ttk.Scrollbar(self, orient='horizontal', command=self.tv.xview)
##        self.tv.configure(yscroll=self.ysb.set, xscroll=self.xsb.set)
##        self.ysb.grid(row=1, column=7, sticky='ns')
##        self.xsb.grid(row=2, column=0, sticky='ew')
        
        ttk.Style().configure("Treeview", font= ('', 11), background="#383838", 
        foreground="white", fieldbackground="yellow")

        self.tv.insert("","end",text = "Person",values = ("1254","MSFT","39.39", "", "0/200", "BUY", "LMT", "Filled", "39.39"), tags='hot')
        self.tv.insert("","end",text = "Animal",values = ("1255","MSFT","39.58", ".10", "0/200", "SELL", "TRAIL", "PreSubmitted", "0.00"), tags='cold')
        self.tv.insert("","end",text = "Name",values = ("1256","MSFT","39.58", "", "0/200", "SELL", "LMT", "Submitted", "0.00"), tags='pizza')
        self.tv.insert("","end",text = "Evil Corp",values = ("1258","NFLX","102.55", "", "0/300", "SELL", "LMT", "Submitted", "0.00"), tags='tacos')

    def remove_all(self):
        x = self.tv.get_children()
        print ('get_children values: ', x ,'\n')
        if x != '()': # checks if there is something in the first row
            for child in x:
                self.tv.delete(child)
                
    def search_symbol(self):
        pass

    def add_data(self):
        pass

    def select_item():
        pass

root = Tk()       
app = Application(root)
root.mainloop()

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