Simple GUI Calculator made with Python

calc.py

from PyQt4 import QtGui
import sys
import math


class Calc(QtGui.QMainWindow):
	def __init__(self):
		super(Calc, self).__init__()

		self.DrawLayout()
		self.DrawTextField()

		self.DrawButtons('1', 0, 1)
		self.DrawButtons('2', 1, 1)
		self.DrawButtons('3', 2, 1)
		self.DrawButtons('+', 3, 1)
		self.DrawButtons('4', 0, 2)
		self.DrawButtons('5', 1, 2)
		self.DrawButtons('6', 2, 2)
		self.DrawButtons('-', 3, 2)
		self.DrawButtons('7', 0, 3)
		self.DrawButtons('8', 1, 3)
		self.DrawButtons('9', 2, 3)
		self.DrawButtons('*', 3, 3)
		self.DrawButtons('C', 0, 4)
		self.DrawButtons('0', 1, 4)
		self.DrawButtons('=', 2, 4)
		self.DrawButtons('/', 3, 4)
		self.show()

	def DrawLayout(self):
		self.setGeometry(100, 100, 700, 700)
		self.setWindowTitle('Calculator')

	def DrawTextField(self):
		self.textfield = QtGui.QLineEdit(' ', self)
		self.textfield.move(50, 100)
		self.textfield.resize(600, 70)

	def DrawButtons(self, text, xDistance, yDistance):
		btn = QtGui.QPushButton(text, self)
		btn.move(160 + (100 * xDistance), 160 + (100 * yDistance))
		btn.resize(60, 50)

		def AppendToTextField():

			if text == "C":
				self.textfield.setText("")
			elif text == "+" or text == "/" or text == "*" or text == "-":
				op = self.textfield.text()[-1]
				if not (op == "+" or op == "-" or op == "*" or op == "/"):
					self.textfield.setText(self.textfield.text() + text)
			elif text.isdigit():
				self.textfield.setText(self.textfield.text() + text)
			elif text == "=":
				textfieldData = self.textfield.text().replace(" ", "")
				tempStack = []

				print(tempStack)

		btn.clicked.connect(AppendToTextField)


app = QtGui.QApplication(sys.argv)

x = Calc()

sys.exit(app.exec_())