class _Entry(_Field):
    def __init__(self, parent, json, **kwargs):
        super().__init__(parent, json, **kwargs)

        self.var = StringVar()
        if self.value:
            self.var.set(self.value)

        self.entry = Entry(self, width=self.width, textvariable=self.var, justify=self.justify)

        self.entry.grid(row=self.row, column=self.column)
        self.grid(
            rowspan=self.rowspan,
            columnspan=self.columnspan,
            padx=self.padx,
            pady=self.pady,
            sticky=self.sticky
        )