用python写一段代码，在windows上运行，使用tkinter，用于比较两段很长的文本content1和content2的差异，content1可加载指定路径的文件。程序能够在可视化界面上展示差异项，展示的窗口分为左界面和右界面，左界面显示content1，右界面显示content2，左界面和右界面内容中，存在差异的部分，用颜色进行标记。

好的，我来为您编写这段代码。

import tkinter as tk
import difflib

class DiffViewer:
    def __init__(self, master):
        self.master = master
        master.title("Diff Viewer")

        # 创建左右两个文本框和滚动条
        scrollbar1 = tk.Scrollbar(master)
        scrollbar1.pack(side=tk.RIGHT, fill=tk.Y)
        self.text1 = tk.Text(master, yscrollcommand=scrollbar1.set, width=50)
        self.text1.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
        scrollbar1.config(command=self.text1.yview)

        scrollbar2 = tk.Scrollbar(master)
        scrollbar2.pack(side=tk.RIGHT, fill=tk.Y)
        self.text2 = tk.Text(master, yscrollcommand=scrollbar2.set, width=50)
        self.text2.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
        scrollbar2.config(command=self.text2.yview)

        # 创建比较按钮
        button = tk.Button(master, text="Compare", command=self.compare)
        button.pack()

    def compare(self):
        content1 = self.load_file()  # 加载文件
        content2 = self.text2.get("1.0", tk.END)  # 获取文本框2的内容

        # 使用difflib库进行比较
        diff = difflib.ndiff(content1.splitlines(), content2.splitlines())

        # 用颜色进行标记不同之处
        self.text1.delete("1.0", tk.END)
        self.text2.delete("1.0", tk.END)
        for line in diff:
            if line.startswith("+"):
                self.text2.insert(tk.END, line[2:] + "\n", "added")
            elif line.startswith("-"):
                self.text1.insert(tk.END, line[2:] + "\n", "deleted")
            else:
                self.text1.insert(tk.END, line + "\n")
                self.text2.insert(tk.END, line + "\n")
        self.text1.tag_config("deleted", foreground="red")
        self.text2.tag_config("added", foreground="green")

    def load_file(self):
        # 打开文件选择对话框
        filepath = tk.filedialog.askopenfilename()
        if filepath:
            # 读取文件内容
            with open(filepath, "r", encoding="utf-8") as f:
                content = f.read()
            # 在文本框1中显示文件内容
            self.text1.delete("1.0", tk.END)
            self.text1.insert(tk.END, content)
            return content
        else:
            return ""

root = tk.Tk()
app = DiffViewer(root)
root.mainloop()

运行以上代码，会弹出一个窗口，左边显示加载的文件内容，右边可以手动输入文本内容，点击“Compare”按钮会比较两个文本的异同，并将不同之处用颜色标记。