其實我最近正在學pyqt，然後看到有個例子是匯率換算器，所以無聊之下換成用tkinter來寫寫看code如下1
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def test2():
import tkinter
from tkinter import ttk
rates = {}
def getdata():
nonlocal rates
try:
date = 'unknown'
fh = request.urlopen("http://www.bankofcanada.ca/en/markets/csv/exchange_eng.csv")
#always remember that in python3 this function returns byte object!!
for line in fh:
line = line.decode('utf-8')# so need to decode
if not line or line.startswith(('#', "Closing ")):
continue
fields = line.split(',')
if line.startswith("Date "):
date = fields[-1]
else:
try:
value = float(fields[-1])
rates[fields[0]] = value
except ValueError:
pass
return "Exchange Rates Date: "+ date
except Exception as e:
return "Failed to downloads:\n%s" % e
def show(event):
try:
num = float(entry.get())
except:
pass
fromCur = float(rates[fromCombo.get()])
toCur = float(rates[toCombo.get()])
result['text'] = fromCur/toCur * num
root = tkinter.Tk()
dateLabel = ttk.Label(root, text=getdata())
listVar = sorted(rates.keys())
fromCombo = ttk.Combobox(root, values=listVar, state='readonly')
fromCombo.current(0)
toCombo = ttk.Combobox(root, values=listVar, state='readonly')
toCombo.current(0)
entry = tkinter.Entry(root)
result = ttk.Label(root, text='...')
calculate = ttk.Button(root, text='calculate')
calculate.bind('<Button-1>', show)
dateLabel.grid(column=0, row=0, columnspan=2, padx=5)
fromCombo.grid(column= 0, row=1, padx=10, pady=5)
toCombo.grid(column=0, row=2, padx=10, pady=5)
entry.grid(column=1, row=1, padx=10, pady=5)
result.grid(column=1, row=2, padx=10, pady=5)
calculate.grid(column=0, row=3, columnspan=2)
root.mainloop()
if __name__ == '__main__':
test2()
由於只是嘗試寫寫所以就沒有特別去想結構了，用了不怎麼好看的寫法 :)
只是有個地方滿好奇的，我用這匯率去算跟台銀給的匯率計算器得出的結果不一樣(汗，不過其實我也不太懂匯率是怎麼得出來的，所以用這個程式得出來的結果看看就好，想要知道目前的匯率還是去台銀官網看吧 :) 或者就是把這篇code所抓取的csv改成台銀的 :)