python tkinter 实时刷新窗口内容_使用Tkinter的Python实时货币转换器

Python为开发GUI(图形用户界面)提供了多种选项。在所有的GUI方法中，tkinter是最常用的方法。它是Python附带的Tk GUI工具包的标准Python接口。Python with tkinter是创建GUI应用程序的最快和最简单的方法。

创建一个tkinter：

1)导入模块tkinter

2)创建主窗口(容器)

3)将任意数量的小部件添加到主窗口。

4)将事件触发器应用于小部件。

让我们创建一个基于GUI的简单实时货币转换器，该转换器可以将金额从一种货币转换为另一种货币。

所需模块：

tkinterrequestsjson

下面是实现：

# import all functions from the tkinter  from tkinter import *  # Create a GUI window root = Tk()   # create a global variables  variable1 = StringVar(root) variable2 = StringVar(root)   # initialise the variables variable1.set("currency") variable2.set("currency")         # Function to perform real time conversion # from one currency to another currency def RealTimeCurrencyConversion():       # importing required libraries     import requests, json       # currency code     from_currency = variable1.get()     to_currency = variable2.get()       # enter your api key here      api_key = "Your_Api_Key"          # base_url variable store base url      base_url = r"https://www.alphavantage.co/query?function = CURRENCY_EXCHANGE_RATE"      # main_url variable store complete url     main_url = base_url + "&from_currency =" + from_currency +         "&to_currency =" + to_currency + "&apikey =" + api_key       # get method of requests module      # return response object      req_ob = requests.get(main_url)       # json method return json format     # data into python dictionary data type.           # result contains list of nested dictionaries     result = req_ob.json()       # parsing the required information     Exchange_Rate = float(result["Realtime Currency Exchange Rate"]                                               ['5. Exchange Rate'])       # get method of Entry widget     # returns current text  as a     # string from text entry box.     amount = float(Amount1_field.get())       # calculation for the conversion     new_amount = round(amount * Exchange_Rate, 3)       # insert method inserting the      # value in the text entry box.      Amount2_field.insert(0, str(new_amount))     # Function for clearing the Entry field def clear_all() :     Amount1_field.delete(0, END)      Amount2_field.delete(0, END)        # Driver code if __name__ == "__main__" :       # Set the background colour of GUI window      root.configure(background = 'light green')          # Set the configuration of GUI window (WidthxHeight)     root.geometry("400x175")          # Create welcome to Real Time Currency Convertor label      headlabel = Label(root, text = 'welcome to Real Time Currency Convertor',                        fg = 'black', bg = "red")        # Create a "Amount :" label      label1 = Label(root, text = "Amount :",                  fg = 'black', bg = 'dark green')           # Create a "From Currency :" label      label2 = Label(root, text = "From Currency",                     fg = 'black', bg = 'dark green')          # Create a "To Currency: " label      label3 = Label(root, text = "To Currency :",                     fg = 'black', bg = 'dark green')       # Create a "Converted Amount :" label      label4 = Label(root, text = "Converted Amount :",                     fg = 'black', bg = 'dark green')       # grid method is used for placing      # the widgets at respective positions      # in table like structure .       headlabel.grid(row = 0, column = 1)      label1.grid(row = 1, column = 0)      label2.grid(row = 2, column = 0)     label3.grid(row = 3, column = 0)     label4.grid(row = 5, column = 0)           # Create a text entry box      # for filling or typing the information.      Amount1_field = Entry(root)      Amount2_field = Entry(root)            # ipadx keyword argument set width of entry space.      Amount1_field.grid(row = 1, column = 1, ipadx ="25")      Amount2_field.grid(row = 5, column = 1, ipadx ="25")       # list of currency codes     CurrenyCode_list = ["INR", "USD", "CAD", "CNY", "DKK", "EUR"]       # create a drop down menu using OptionMenu function     # which takes window name, variable and choices as     # an argument. use * befor the name of the list,     # to unpack the values     FromCurrency_option = OptionMenu(root, variable1, *CurrenyCode_list)     ToCurrency_option = OptionMenu(root, variable2, *CurrenyCode_list)           FromCurrency_option.grid(row = 2, column = 1, ipadx = 10)     ToCurrency_option.grid(row = 3, column = 1, ipadx = 10)           # Create a Convert Button and attached      # with RealTimeCurrencyExchangeRate function      button1 = Button(root, text = "Convert", bg = "red", fg = "black",                                 command = RealTimeCurrencyConversion)           button1.grid(row = 4, column = 1)       # Create a Clear Button and attached      # with delete function      button2 = Button(root, text = "Clear", bg = "red",                       fg = "black", command = clear_all)     button2.grid(row = 6, column = 1)         # Start the GUI      root.mainloop()  

输出：