我是Python的新手，并且非常努力理解这门语言，因为我不是程序员，而是在努力学习。
我正在尝试创建一个简单的程序，它接受用户输入并从该行返回特定数据。
用户将输入用户ID和PIN＃，然后按登录按钮。然后，两个文本框将显示用户检查和储蓄余额。
该文件的名称允许调用account.txt在选项卡提交的文本文件中包含以下数据：
userid pin# savingsbalance checkingbalance
所以我的文件如下所示。我有5个用户：
dwarner 2013 845.34 10944.44
kwarner 2014 844.23 5478.32
jwarner 2015 239.00 4593.44
ewarner 2016 943.22 9325.76
fwarner 2017 345.987 8763.65
我希望用户输入用户名和pin＃，然后在2个单独的文本框中显示检查和保存余额。我正在努力理解的是如何从文本文件和该行的特定数据返回特定行。
我在下面创建了一个基本程序，打开文件进行读取并显示所有数据。我只需要它来返回登录用户的检查和储蓄余额。现在我在代码中没有文本框，但甚至不知道如何返回我需要的特定数据。
非常感谢任何帮助。
'''
Created on Feb 12, 2014
@author: Dirk
'''
def readname(filename):
infile = open(filename, 'r')
for line in infile:
print(line)
#return name
def main():
filename = "/home/ia5040/workspace/IA5040PythonSamples/IA5040SamplesPackage/atm.txt"
name = readname(filename)
main()
这是我使用zell python 3书中的graphics.py和button.py代码的新代码：
来自图片导入* 来自按钮导入按钮
类ATM： ＃这个类实现了一个简单的ATM
def __init__(self):
# create the window for the ATM
win = GraphWin("Money Magic", 600, 480)
win.setCoords(0,0,10,10)
win.setBackground("grey")
self.win = win
# Now create the widgets
self.__createButtons()
self.__createDisplay()
self.__createDisplay1()
self.__createDisplay2()
self.__createDisplay3()
def __createButtons(self):
# create list of buttons
# start with all the standard sized buttons
# bSpecs gives center coords and label of buttons
bSpecs = [(1.2,7,'Login'), (3.2,7,'Logout'),
(1.2,5,'Exit'), (3.2,5,'Withdraw')]
self.buttons = []
for (cx,cy,label) in bSpecs:
self.buttons.append(Button(self.win,Point(cx,cy),1.5,.50,label))
# create the larger = button
#self.buttons.append(Button(self.win, Point(4.5,1), 1.75, .75, "="))
# activate all buttons
for b in self.buttons:
b.activate()
def __createDisplay(self):
bg = Rectangle(Point(.5,8.5), Point(2.0,9))
bg.setFill('white')
bg.draw(self.win)
text = Text(Point(1,6), "")
text.draw(self.win)
label = Text(Point(1.3,8.2), "User ID")
label.draw(self.win)
text.setFace("courier")
text.`enter code here`setStyle("bold")
text.setSize(16)
self.display = text
def __createDisplay1(self):
bg = Rectangle(Point(2.5,8.5), Point(4.0,9))
bg.setFill('white')
bg.draw(self.win)
text = Text(Point(1,6), "")
text.draw(self.win)
label = Text(Point(3.3,8.2), "Pin #")
label.draw(self.win)
text.setFace("courier")
text.setStyle("bold")
text.setSize(16)
self.display = text
def __createDisplay2(self):
bg = Rectangle(Point(6,8.5), Point(8,9))
bg.setFill('white')
bg.draw(self.win)
text = Text(Point(1,6), "")
text.draw(self.win)
label = Text(Point(7,8.2), "Checking")
label.draw(self.win)
text.setFace("courier")
text.setStyle("bold")
text.setSize(16)
self.display = text
def __createDisplay3(self):
bg = Rectangle(Point(6,6.5), Point(8,7))
bg.setFill('white')
bg.draw(self.win)
text = Text(Point(1,6), "")
text.draw(self.win)
label = Text(Point(7,6.2), "Savings")
label.draw(self.win)
text.setFace("courier")
text.setStyle("bold")
text.setSize(16)
self.display = text
def getButton(self):
# Waits for a button to be clicked and returns the label of
# the button that was clicked.
while True:
p = self.win.getMouse()
for b in self.buttons:
if b.clicked(p):
return b.getLabel() # method exit
def processButton(self, key):
# Updates the display of the calculator for press of this key
text = self.display.getText()
if key == 'C':
self.display.setText("")
elif key == '<-':
# Backspace, slice off the last character.
self.display.setText(text[:-1])
elif key == '=':
# Evaluate the expresssion and display the result.
# the try...except mechanism "catches" errors in the
# formula being evaluated.
try:
result = eval(text)
except:
result = 'ERROR'
self.display.setText(str(result))
else:
# Normal key press, append it to the end of the display
self.display.setText(text+key)
def run(self):
# Infinite 'event loop' to process button clicks.
while True:
key = self.getButton()
self.processButton(key)
# This runs the program.
if __name__ == '__main__':
# First create a ATM object
theATM = ATM()
# Now call the ATM's run method.
theATM.run()