Question

当我在python3中运行Python脚本时它运行良好但在python 2.7中我收到错误，我应该在Python 2.7中运行此代码：

这是我的代码：我想在路径查找上测试一些算法，并希望创建一个由网格组成的窗口，我可以在单击时拖动鼠标创建墙壁并通过右键单击并拖动来删除它们

const template = document.createElement('template');
template.innerHTML = `
    <form>
        <button class="g-recaptcha" 
            data-sitekey="your_site_key" 
            data-callback='onSubmit'>Submit</button>
    </form>
`;

class CustomElement extends HTMLElement {
  constructor() {
    super(); // always call super() first in the ctor.
    this.attachShadow({mode: 'open'});
    this.shadowRoot.appendChild(template.content.cloneNode(true));
  }
  connectedCallback() {
    ...
  }
  disconnectedCallback() {
    ...
  }
  attributeChangedCallback(attrName, oldVal, newVal) {
    ...
  }
}

错误：

import Tkinter

class Cell():
    FILLED_COLOR_BG = "green"
    EMPTY_COLOR_BG = "white"
    FILLED_COLOR_BORDER = "green"
    EMPTY_COLOR_BORDER = "black"

    def __init__(self, master, x, y, size):
        """ Constructor of the object called by Cell(...) """
        self.master = master
        self.abs = x
        self.ord = y
        self.size= size
        self.fill= False

    def _switch(self):
        """ Switch if the cell is filled or not. """
        self.fill= not self.fill

    def draw(self):
        """ order to the cell to draw its representation on the canvas """
        if self.master != None :
            fill = Cell.FILLED_COLOR_BG
            outline = Cell.FILLED_COLOR_BORDER

            if not self.fill:
                fill = Cell.EMPTY_COLOR_BG
                outline = Cell.EMPTY_COLOR_BORDER

            xmin = self.abs * self.size
            xmax = xmin + self.size
            ymin = self.ord * self.size
            ymax = ymin + self.size

            self.master.create_rectangle(xmin, ymin, xmax, ymax, fill = fill, outline = outline)

class CellGrid(Canvas):
    def __init__(self,master, rowNumber, columnNumber, cellSize, *args, **kwargs):
        Canvas.__init__(self, master, width = cellSize * columnNumber , height = cellSize * rowNumber, *args, **kwargs)

        self.cellSize = cellSize

        self.grid = []
        for row in range(rowNumber):

            line = []
            for column in range(columnNumber):
                line.append(Cell(self, column, row, cellSize))

            self.grid.append(line)

        #memorize the cells that have been modified to avoid many switching of state during mouse motion.
        self.switched = []

        #bind click action
        self.bind("<Button-1>", self.handleMouseClick)  
        #bind moving while clicking
        self.bind("<B1-Motion>", self.handleMouseMotion)
        #bind release button action - clear the memory of midified cells.
        self.bind("<ButtonRelease-1>", lambda event: self.switched.clear())

        self.draw()



    def draw(self):
        for row in self.grid:
            for cell in row:
                cell.draw()

    def _eventCoords(self, event):
        row = int(event.y / self.cellSize)
        column = int(event.x / self.cellSize)
        return row, column

    def handleMouseClick(self, event):
        row, column = self._eventCoords(event)
        cell = self.grid[row][column]
        cell._switch()
        cell.draw()
        #add the cell to the list of cell switched during the click
        self.switched.append(cell)

    def handleMouseMotion(self, event):
        row, column = self._eventCoords(event)
        cell = self.grid[row][column]

        if cell not in self.switched:
            cell._switch()
            cell.draw()
            self.switched.append(cell)


if __name__ == "__main__" :
    app = Tk()

    grid = CellGrid(app, 50, 50, 10)
    grid.pack()

    app.mainloop()

如何更改我的代码以便在Python 2.7中运行它？

Answer 1

好吧，它没有定义好，我想知道怎么能在Py3上运行，除非Tkinter以某种方式将Canvas转储到你的命名空间。

您可能想要class CellGrid(Tkinter.Canvas)，但我不记得Tkinter的确切结构，因此可能是在子包装或其他东西。

Answer 2

在您的情况下，您需要导入要使用的模块元素：

from Tkinter import Canvas, Tk

你也可以这样做：

from Tkinter import *

但并不是建议的做法。如果您使用许多模块，那么您的代码可能无法正常运行，并且它们中的两个具有相同的方法名称。

最后一种方法就是

import Tkinker

但是每次使用此模块的元素时，都需要添加完整路径，因此如果您想使用Canvas，则需要使用Tkinker.Canvas。

另请注意，在Python 2.7中，您import Tkinter和3.X import tkinter

如何解决python2.7中的Name错误

2 个答案: