腌制字典数据然后加载它不起作用

Question

我正在制作一个客户列表，我正在使用字典和 pickle 来保存和存储客户的姓名和年龄。不幸的是，我的保存功能会覆盖任何现有用户，然后我的__init__ 功能不会在字典中显示腌制数据，而只会显示我自己输入的数据。 add 函数也不会显示带有客户名称的标签。你能帮忙解决泡菜的问题吗，因为我需要一个快速的答案！

提前致谢！

from Tkinter import *
import pickle


root=Tk()
dic={}
class Launch(object):
    def __init__(self, root):
        root.withdraw()
        root=Toplevel(root)
        root.title("Choose Client")
        self.row=3
        for key in dic:
            Label(root, text=key).grid(row=row, column=0)
            self.row+=1
        l3=Label(root, text="Client Name")
        l3.grid(row=0, column=0)
        self.e1=Entry(root)
        self.e1.grid(row=0, column=1)
        l4=Label(root, text="Client age")
        l4.grid(row=1, column=0)
        self.e2=Entry(root)
        self.e2.grid(row=1, column=1)
        b3=Button(root, text="Create client", command=self.add)
        b3.grid(row=2)

    def add(self):
        client=self.e1.get()
        age=self.e2.get()
        dic[client]=age
        Label(root, text="%s" % (client)).grid(row=self.row)
        with open("data", "w") as f:
            pickle.dump(dic, f)


    def load(self):
        dic=pickle.load(open("data", "rb"))


app=Launch(root)
root.mainloop()

Answer 1

根本没有使用load 方法。以下是修改代码以使用load。

from Tkinter import *
import pickle


root=Tk()
dic={}

class Launch(object):
    def __init__(self, root):
        self.load()  # <-- load
        root.title("Choose Client")
        self.row = 3
        for key in dic:
            Label(root, text=key).grid(row=self.row, column=0)
            self.row += 1
        l3=Label(root, text="Client Name")
        l3.grid(row=0, column=0)
        self.e1=Entry(root)
        self.e1.grid(row=0, column=1)
        l4=Label(root, text="Client age")
        l4.grid(row=1, column=0)
        self.e2=Entry(root)
        self.e2.grid(row=1, column=1)
        b3=Button(root, text="Create client", command=self.add)
        b3.grid(row=2)

    def add(self):
        client=self.e1.get()
        age=self.e2.get()
        dic[client]=age
        Label(root, text=client).grid(row=self.row)
        self.row += 1  # <--- increase row count
        with open("data", "wb") as f:
            pickle.dump(dic, f)

    def load(self):
        # should be declared, otherwise, will create local variable
        global dic
        try:
            dic = pickle.load(open("data", "rb"))
        except IOError:  # if file does not exist.
            pass


app = Launch(root)
root.mainloop()

---

以下是另一个使用实例变量而不是全局变量的版本：

from Tkinter import *
import pickle

class Launch(object):
    def __init__(self, root):
        self.load()  # <-- load
        root.title("Choose Client")
        self.row = 3
        for key in self.dic:
            Label(root, text=key).grid(row=self.row, column=0)
            self.row += 1
        l3 = Label(root, text="Client Name")
        l3.grid(row=0, column=0)
        self.e1 = Entry(root)
        self.e1.grid(row=0, column=1)
        l4 = Label(root, text="Client age")
        l4.grid(row=1, column=0)
        self.e2 = Entry(root)
        self.e2.grid(row=1, column=1)
        b3 = Button(root, text="Create client", command=self.add)
        b3.grid(row=2)

    def add(self):
        client = self.e1.get()
        age = self.e2.get()
        self.dic[client] = age
        Label(root, text=client).grid(row=self.row)
        self.row += 1  # <--- increase row count
        with open("data", "wb") as f:
            pickle.dump(self.dic, f)

    def load(self):
        try:
            self.dic = pickle.load(open("data", "rb"))
        except IOError:
            self.dic = {}


root = Tk()
app = Launch(root)
root.mainloop()