你可以使用Python中的difflib模块来执行代码级别的比对。以下是一个简单的示例脚本，假设你已经使用git克隆了开源库并希望比较本地代码和最新的开源库代码：

import difflib
from pathlib import Path

# 定义本地代码和开源库代码的路径
local_code_path = Path("path/to/your/local/code")
remote_code_path = Path("path/to/your/open-source/library")

# 读取本地代码和开源库代码
with open(local_code_path, 'r', encoding='utf-8') as local_file:
    local_code = local_file.readlines()

with open(remote_code_path, 'r', encoding='utf-8') as remote_file:
    remote_code = remote_file.readlines()

# 使用difflib进行比对
differ = difflib.Differ()
diff = list(differ.compare(local_code, remote_code))

# 打印比对结果
for line in diff:
    print(line)

请替换"path/to/your/local/code"和"path/to/your/open-source/library"为你本地代码和开源库代码的实际路径。这个脚本将输出代码行之间的差异。