mirror of
https://github.com/gryf/debugging_python.git
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101 lines
3.2 KiB
Python
101 lines
3.2 KiB
Python
import Tkinter as tk
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class CmInchConverter(object):
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"""Simple conversion between length in cm to inch and inch to cm"""
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def __init__(self):
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"""Initialize"""
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self._root = None
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self.value = "0"
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self.result = "0"
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self.convert_to_inches = None
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def run(self):
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"""Create and execute program"""
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self._gui_initialize()
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self._root.mainloop()
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def calculate(self):
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"""Perform calculation"""
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action = {1: self._inch_calculate,
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2: self._cm_calculate}
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try:
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val = int(self.value.get())
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except ValueError:
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val = self.value.get()
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result = action[self.convert_to_inches.get()](val)
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self.result.set(result)
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def _inch_calculate(self, val):
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"""Calculate inch value from given val in cm"""
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try:
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return "%.4f" % val * 0.3937
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except TypeError:
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return "Err"
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def _cm_calculate(self, val):
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"""Calculate cm value from given val in inch"""
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try:
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return "%.4f" % val/0.3937
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except TypeError:
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return "Err"
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def _gui_initialize(self):
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"""Initialize the GUI"""
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self._root = tk.Tk()
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self._root.title("inch/cm converter")
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self.convert_to_inches = tk.IntVar()
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self.value = tk.StringVar()
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self.result = tk.StringVar()
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self.convert_to_inches.set(1)
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self.value.set("0")
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self.result.set("0")
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mainframe = tk.Frame(self._root, pady=5, padx=5)
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mainframe.grid(column=0, row=0, sticky=(tk.N, tk.W, tk.E, tk.S))
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mainframe.columnconfigure(0, weight=1)
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mainframe.rowconfigure(0, weight=1)
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defaults = {"padx": 2, "pady": 2, "sticky": tk.W}
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radio1 = tk.Radiobutton(mainframe,
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text="cm to inches",
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padx=2,
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variable=self.convert_to_inches,
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value=1)
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radio1.grid(column=0, row=2, columnspan=2, **defaults)
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radio2 = tk.Radiobutton(mainframe,
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text="inches to cm",
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padx=2,
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variable=self.convert_to_inches,
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value=2)
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radio2.grid(column=0, row=3, columnspan=2, **defaults)
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tk.Label(mainframe, text="Enter value:").grid(column=0, row=1,
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**defaults)
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entry1 = tk.Entry(mainframe, width=20, textvariable=self.value)
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entry1.grid(column=1, row=1, **defaults)
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tk.Label(mainframe, text="Result:").grid(column=0, row=4, **defaults)
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entry2 = tk.Entry(mainframe, width=20, state=tk.DISABLED,
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textvariable=self.result,
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disabledbackground="White Smoke",
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disabledforeground="Midnight Blue")
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entry2.grid(column=1, row=4, **defaults)
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tk.Button(mainframe, text="Calculate",
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command=self.calculate).grid(column=3, row=5, **defaults)
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def main():
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"""Main function"""
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conv = CmInchConverter()
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conv.run()
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if __name__ == '__main__':
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main()
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