Question

我目前在我的python类中遇到了我的货币转换程序问题。我试图将一个金额，即条目小部件，从起始货币，第一个选项菜单转换为所需的货币，第二个选项菜单。我花了几个小时阅读文档，所以我希望你能给我一些意见！目前我的列表中只有两种货币，因此更容易测试。所需的结果将是一个动态程序，一旦点击转换按钮，它将能够读取金额，货币1和货币2。这是我的代码：

getAllCouses

Answer 1

我的回答并不能让我满意，所以我解决了你的问题。变化：

向currAmount1，currAmount2添加了自我关键字，并在脚本中的任何位置反映了此更改。（currAmount1 - ＆gt; self.currAmount1）

在.get()开头的Tkinter变量上调用curr_search()：

cur1 = self.curr_start1.get()
cur2 = self.curr_start2.get()
amount = self.currAmount1.get()

我没有将整个web_obj文件打开成一个变量（它不起作用），而是逐行读取文件并在每一行上调用reg表达式搜索。当搜索产生我们期望的结果（除None之外的任何东西）时，我将此结果存储在final_str中。
在文件末尾添加了一个检查：如果map返回一个整数值（例如，将1USD转换为USD将返回1），我只获取地图的第一个元素，或者我使用你现有的表达方式。
最后，我实现了一种显示结果的方法：
```
self.currEntry2.delete(0, tk.END)
self.currEntry2.insert(tk.END, final)
```
将在第二个输入字段中显示结果。

这是最终的代码：

# Module imports
import Tkinter as tk
import tkMessageBox
import urllib2
import re

# Function Definitions
class Application(tk.Frame):

    def __init__(self, parent = None):
        tk.Frame.__init__(self, parent)
        self.parent = parent
        self.setupUI()
        self.createWidgets()

    def setupUI(self):
        self.parent.title("User Input")
        self.grid()
        self.centerWindow()

    def centerWindow(self):
        app_width = 307
        app_height = 350

        sw = self.parent.winfo_screenwidth()
        sh = self.parent.winfo_screenheight()

        x = (sw - app_width)/2
        y = (sh - app_height)/2
        self.parent.geometry('%dx%d+%d+%d' % (app_width, app_height, x, y))

    def createWidgets(self):
        self.emptyFrame = tk.Frame(self.parent,bg="white")
        self.emptyFrame.grid(row=0,column=0,sticky="news")
        self.parent.grid_columnconfigure(0,weight=1)
        self.parent.grid_rowconfigure(0,weight=1)

        self.label1 = tk.Label(self.emptyFrame,text="Currency Converter",bg="white",font="Arial 26")
        self.label1.grid(row=0,column=0, sticky="news")
        self.label2 = tk.Label(self.emptyFrame,text="Visit http://www.xe.com/iso4217.php\nFor Currency Code Information",bg="white",font="Arial 8")
        self.label2.grid(row=0,column=0, sticky="news")
        self.label2.place(x = 55, y = 40)

        self.currAmount1 = tk.StringVar()                                    # Adding user imput for what value they want to convert
        self.currEntry1 = tk.Entry(self.parent, textvariable=self.currAmount1,bd=2,width=28,background="white")
        self.currEntry1.grid()
        self.currEntry1.place(x = 27, y = 125)


        self.currAmount2 = tk.StringVar()
        self.currEntry2 = tk.Entry(self.parent,textvariable=self.currAmount2,bd=2,width=28,background="white")
        self.currEntry2.grid()
        self.currEntry2.place(x = 27, y = 195)

        self.currency_list1 = ['USD','GBP'] #Creating the Currency Options menu and adding a list for all the currencies
        self.curr_start1 = tk.StringVar()
        self.curr_start1.set(self.currency_list1[0])
        self.currencyMenu1 = tk.OptionMenu(self.parent, self.curr_start1, *self.currency_list1)
        self.currencyMenu1.grid(row=0,column=0)
        self.currencyMenu1.place(x = 230, y = 120)


        self.currency_list2 = ['USD','GBP'] #Creating the Currency Options menu and adding a list for all the currencies
        self.curr_start2 = tk.StringVar()
        self.curr_start2.set(self.currency_list2[0])
        self.currencyMenu2 = tk.OptionMenu(self.parent, self.curr_start2, *self.currency_list2)
        self.currencyMenu2.grid(row=0,column=0)
        self.currencyMenu2.place(x = 230, y = 190)


        self.convertBtn = tk.Button(self.parent, text="Convert", font="Times 12", command=self.curr_search)
        self.convertBtn.grid()
        self.convertBtn.place(x = 120,y = 225)

    def curr_search(self):
        cur1 = self.curr_start1.get()
        cur2 = self.curr_start2.get()
        amount = self.currAmount1.get()
        url = 'https://www.google.com/finance/converter?' 
        final_url = url + 'a=' + str(amount) + '&from=' + str(cur1) + '&to=' + str(cur2) # Adds the paramters the user inputs to the general url for converting to currencies
        web_obj = urllib2.urlopen(final_url) 

        #Read each line , check if reg expression is in

        for line in web_obj:
            line = line.replace('\n', '')
            line = re.search('class=bld>(.+?)</span>', line)
            if line is not None:
                final_str = line

        final_str = final_str.group(1) # Extracts the string between the class and </span> which is the final conversion
        final_num = map(int, re.findall(r'\d+', final_str)) # Extracts the integers from the final_str so that it wouldn't have the currency code in the final. Puts in a list

        #If number is a decimal number, group, else take integer
        if len(final_num) > 1:
            final = str(final_num[0]) + '.' + str(final_num[1]) # Adds the decimal back from 
        else:
            final = str(final_num[0])

        web_obj.close()
        self.currEntry2.delete(0, tk.END)
        self.currEntry2.insert(tk.END, final)   
        return final

# Main body
root = tk.Tk()
root.resizable(width=False, height=False)
app = Application(root)
root.mainloop()

货币转换器中tk条目和optionmenu小部件的问题

1 个答案: