用Flutter做项目开发一段时间后，根据产品功能的迭代发展，有些插件可能已经不在代码中用到了，所以需要对插件进行清理操作。本操作是在Mac下通过python脚本来实现的，如果是Linux或Windows，可能执行python时会有差异。

首先，在Flutter工程根目录下创建和激活python虚拟环境，打开命令行工具：

• 创建虚拟环境：python3 -m venv myenv

• 激活虚拟环境（在Linux/MacOS）：source myenv/bin/activate

• 或者在Windows：myenv\Scripts\activate

• 安装PyYAML库：pip3 install pyyaml

创建python文件 script.py

import os
import yaml

# Load pubspec.yaml
with open('pubspec.yaml', 'r') as file:
    pubspec = yaml.safe_load(file)

# Get a list of all dependencies
dependencies = set(pubspec['dependencies'].keys())

# Function to find all import statements in a file
def find_imports(file_path):
    imports = set()
    with open(file_path, 'r') as file:
        for line in file:
            if line.strip().startswith('import'):
                import_path = line.split(' ')[1].strip().strip("'").strip('"')
                if 'package:' in import_path:
                    package_name = import_path.split('/')[0].replace('package:', '')
                    imports.add(package_name)
    return imports

# Traverse the project and gather all imports
project_imports = set()
for root, dirs, files in os.walk('.'):
    for file_name in files:
        if file_name.endswith('.dart'):
            file_path = os.path.join(root, file_name)
            project_imports.update(find_imports(file_path))

# Find unused dependencies
unused_dependencies = dependencies - project_imports

print(f"Unused dependencies: {unused_dependencies}")

最后，执行脚本：python3 your_script.py