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提取网络图片的颜色色值 import 'package:flutter/material.dart'; import 'package:palette_generator/palette_generator.dart'; import 'package:http/http.dart' as http; Future<PaletteGenerator> generatePaletteFromImageUrl(String imageUrl) async { final response = await http.get(Uri.parse(imageUrl)); final bytes = response.bodyBytes; final image = await decodeImageFromList(bytes); return PaletteGenerator.fromImage(image); }
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pip设置国内清华源的问题 解决方式：python3 -m pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple --userERROR: Unable to save configuration. Please report this as a bug.Traceback (most recent call last): File "C:\Users\x1913\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\pip\_internal\configuration.py", line 215, in savewith open(fname, "w") as f:PermissionError: [Errno 13] Permission denied: 'C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.3056.0_x64__qbz5n2kfra8p0\pip.ini'During handling of the above exception, another exception occurred:Traceback (most recent call last): File "C:\Users\x1913\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\pip\_internal\commands\configuration.py", line 267, in _save_configurationself.configuration.save()File "C:\Users\x1913\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\pip\_internal\configuration.py", line 218, in saveraise ConfigurationError(pip._internal.exceptions.ConfigurationError: An error occurred while writing to the configuration file C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.3056.0_x64__qbz5n2kfra8p0\pip.ini: [Errno 13] Permission denied: 'C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.3056.0_x64__qbz5n2kfra8p0\pip.ini'ERROR: Internal Error.
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