Python ] }) 已解析=美化组(分别为文本“lxml”,仅解析=筛选数据) idx=combo.current()#获取组合框选择的索引 尝试: dst_td_tags=parsed.find('td',string=self.query_list[idx])。find_next_同胞() 除: 导入回溯 打印(traceback.format_exc()) raise Name ERROR(f'===必须与网页上的数据匹配。名称:{self.query_list[idx]}===')#文字格式Py3.6↑ dst_列表=[dst_td_标记中td的td.text] 价格、变更、变更百分比、更新时间=dst列表 change_percent=change_percent.split('%')[0]#只要可以使用str.replace(),就应该使用它而不是re.sub。 更新时间=更新时间。替换('\n\t','') 更改百分比=更改百分比 更新时间=更新时间 self.\u intvar\u price.set(价格) self.\u strvar\u change.set(更改) self.\u strvar\u change\u percent.set(更改百分比) self.\u strvar\u update\u time.set(更新时间) 如果uuuu name uuuuuu='\uuuuuuu main\uuuuuuu': obj=CQueryOil([“WTI原油”、“布伦特原油”、“火星美国”、“欧佩克篮子”、“加拿大原油指数”))#必须与网页上的数据相匹配 obj.run()

Python ] }) 已解析=美化组(分别为文本“lxml”,仅解析=筛选数据) idx=combo.current()#获取组合框选择的索引 尝试: dst_td_tags=parsed.find('td',string=self.query_list[idx])。find_next_同胞() 除: 导入回溯 打印(traceback.format_exc()) raise Name ERROR(f'===必须与网页上的数据匹配。名称:{self.query_list[idx]}===')#文字格式Py3.6↑ dst_列表=[dst_td_标记中td的td.text] 价格、变更、变更百分比、更新时间=dst列表 change_percent=change_percent.split('%')[0]#只要可以使用str.replace(),就应该使用它而不是re.sub。 更新时间=更新时间。替换('\n\t','') 更改百分比=更改百分比 更新时间=更新时间 self.\u intvar\u price.set(价格) self.\u strvar\u change.set(更改) self.\u strvar\u change\u percent.set(更改百分比) self.\u strvar\u update\u time.set(更新时间) 如果uuuu name uuuuuu='\uuuuuuu main\uuuuuuu': obj=CQueryOil([“WTI原油”、“布伦特原油”、“火星美国”、“欧佩克篮子”、“加拿大原油指数”))#必须与网页上的数据相匹配 obj.run(),python,tkinter,Python,Tkinter,正确的方法是使用StringVar设置标签的初始值,然后只需调用要更新的StringVar实例的.set()方法 例如: price_str = StringVar() prica_label = Label(root, textvariable=price_str).pack() price_str.set("new price") import tkinter as tk counter = 0 def counter_label(label): def count():

正确的方法是使用
StringVar
设置
标签的初始值,然后只需调用要更新的
StringVar
实例的
.set()
方法

例如:

price_str = StringVar()
prica_label = Label(root, textvariable=price_str).pack()
price_str.set("new price")
import tkinter as tk

counter = 0 
def counter_label(label):
  def count():
    global counter
    counter += 1
    label.config(text=str(counter))
    label.after(1000, count)
  count()


root = tk.Tk()
root.title("Counting Seconds")
label = tk.Label(root, fg="green")
label.pack()
counter_label(label)
button = tk.Button(root, text='Stop', width=25, command=root.destroy)
button.pack()
root.mainloop()
from tkinter import *
from tkinter.ttk import *
import requests
from tkinter.ttk import Combobox
from bs4 import BeautifulSoup, SoupStrainer
# import re  # As long as you can make do with str.replace(), you should use it instead of re.sub.


class CQueryOil(Tk):

    def __init__(self, query_country: list):
        super().__init__()  # init Tk
        self.__url = 'http://oilprice.com/oil-price-charts/45'
        self._query_country = query_country
        self._intvar_price = IntVar()
        self._strvar_change = StringVar(value='')
        self._strvar_change_percent = StringVar(value='')
        self._strvar_update_time = StringVar(value='')
        self.init_ui()

    @property
    def url(self):
        return self.__url

    @property
    def query_list(self):
        return self._query_country

    def run(self):
        self.mainloop()

    def init_ui(self) -> None:
        self.geometry("225x125")
        self.resizable(0, 0)
        self.title("Global Oil Price GUI")
        [self.grid_columnconfigure(col, weight=1) for col in (1, 2)]

        n_padx = 5
        Label(self, text="Futures & Indexes", justify=LEFT).grid(row=0, column=0, padx=n_padx, sticky='w')
        combo = Combobox(self, values=self.query_list, width=17)
        combo.grid(row=1, column=0, padx=n_padx, columnspan=2, sticky='w')
        combo.bind("<<ComboboxSelected>>", lambda event: self.update(event, combo=combo))

        for cur_row, label_name in enumerate(['Price (USD):', 'Change:', 'Change Percent:', 'Last Updated:']):
            Label(self, text=label_name, width=14).grid(row=2 + cur_row, column=0, padx=n_padx, sticky='e')

        Label(self, textvariable=self._intvar_price).grid(row=2, column=1, sticky='w')
        Label(self, textvariable=self._strvar_change).grid(row=3, column=1, sticky='w')
        Label(self, textvariable=self._strvar_change_percent).grid(row=4, column=1, sticky='w')
        Label(self, textvariable=self._strvar_update_time).grid(row=5, column=1, sticky='w')

    def update(self, event, combo) -> None:
        resp = requests.get(self.url)
        if resp.status_code != 200:
            return

        filter_data = SoupStrainer('tr', attrs={'class': ['stripe show_graph', 'stripe show_graph update_on_load']
                                                # 'data-id': ['45', '46', '50', '29', '68']
                                                })
        parsed = BeautifulSoup(resp.text, 'lxml', parse_only=filter_data)

        idx = combo.current()  # Get index of combobox selection
        try:
            dst_td_tags = parsed.find('td', string=self.query_list[idx]).find_next_siblings()
        except:
            import traceback
            print(traceback.format_exc())
            raise NameError(f'====Must match the data on the web page. Name:{self.query_list[idx]}=====')  # literal format Py3.6↑
        dst_list = [td.text for td in dst_td_tags]

        price, change, change_percent, update_time = dst_list
        change_percent = change_percent.split('%')[0]  # As long as you can make do with str.replace(), you should use it instead of re.sub.
        update_time = update_time.replace('\n\t', ' ')
        change_percent = change_percent
        update_time = update_time

        self._intvar_price.set(price)
        self._strvar_change.set(change)
        self._strvar_change_percent.set(change_percent)
        self._strvar_update_time.set(update_time)


if __name__ == '__main__':
    obj = CQueryOil(["WTI Crude", "Brent Crude", "Mars US", "Opec Basket", "Canadian Crude Index"])  # Must match the data on the web page
    obj.run()


price_str = StringVar()
prica_label = Label(root, textvariable=price_str).pack()
price_str.set("new price")