计算器：Python class 中的名称错误

Question

我正在构建一个计算器。我得到了我的代码的 "NameError: name 'self' is not defined the statement "if self.op.Pending == True" 部分。我尝试设置等于 None 的值，但这并没有消除错误。如何我摆脱了错误？

class calculator():
    def __init__(self):
        self.total = 0
        self.current = ""
        self.newNumber = True
        self.opPending = False
        self.op = ""
        self.eq = False

    def numberPress (self, num): 
        self.eq = False
        temp = textbox.get()
        temp2 = str(num)

    if self.newNumber:
        self.current = temp2
        self.newNumber = False
    else:
        if temp2 == '.':
            if temp2 in temp:
                return
            self.current = temp + temp2
            self.display(self.current)

    def calcTotal(self):
        self.eq = True
        self.currrent = float(self.current)

    if self.opPending == True: #ERROR
        self.doSum()
    else:
            self.total = float(textbox.get())

Answer 1

self 未在您的各个函数之外定义，这就是为什么在每个函数中您必须调用 def func(self...):

因此，在函数中调用它：

class calculator():
    def __init__(self):
        self.total = 0
        self.current = ""
        self.newNumber = True
        self.opPending = False
        self.op = ""
        self.eq = False

    def numberPress (self, num): 
        self.eq = False
        temp = textbox.get()
        temp2 = str(num)

        if self.newNumber:
            self.current = temp2
            self.newNumber = False
        else:
            if temp2 == '.':
                if temp2 in temp:
                    return
                self.current = temp + temp2
                self.display(self.current)

    def calcTotal(self):
        self.eq = True
        self.currrent = float(self.current)

    def call(self):
        if self.opPending == True: #ERROR
            self.doSum()
        else:
            self.total = float(textbox.get())

Answer 2

这是因为你有缩进错误：

这就是计入 numpress 的所有内容：

def numberPress (self, num): 
        self.eq = False
        temp = textbox.get()
        temp2 = str(num)

接下来的几行是函数的“外部”：

 if self.newNumber:
        self.current = temp2
        self.newNumber = False
    else:
        if temp2 == '.':
            if temp2 in temp:
                return
            self.current = temp + temp2
            self.display(self.current)

同样的事情发生在def calcTotal(self):。

要解决此问题，您只需在“outside”

行中添加 4 个空格

计算器：Python class 中的名称错误

Calculator: Name Error in Python class

python

variables

class

calculator

statements