无法从谷歌云存储下载文件: ValueError("%r无法转换为unicode“%(值，))

Question

我正在尝试使用Python从我的云存储存储桶中下载文件：

GCP_BUCKET_NAME = "my-learning-bucket"
storage_bucket = storage_client.bucket(GCP_BUCKET_NAME)


def download_object(download_obj_name):
    blob = storage_bucket.blob(download_obj_name)
    blob.download_to_file_name(f"downloads/data.db")

但它给了我一个错误：

Traceback (most recent call last):
  File "/Users/asnimansari/Desktop/tradestation/ares/main.py", line 22, in <module>
    root.run_click_commands()
  File "/Users/asnimansari/.pyenv/versions/3.9.4/lib/python3.9/site-packages/click/core.py", line 1137, in __call__
    return self.main(*args, **kwargs)
  File "/Users/asnimansari/.pyenv/versions/3.9.4/lib/python3.9/site-packages/click/core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "/Users/asnimansari/.pyenv/versions/3.9.4/lib/python3.9/site-packages/click/core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/asnimansari/.pyenv/versions/3.9.4/lib/python3.9/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/asnimansari/.pyenv/versions/3.9.4/lib/python3.9/site-packages/click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "/Users/asnimansari/Desktop/tradestation/ares/commands/import_data.py", line 9, in import_data
    import_latest_data_from_gc()
  File "/Users/asnimansari/Desktop/tradestation/ares/helpers/import_data_from_gc.py", line 8, in import_latest_data_from_gc
    db_names_in_gcp = get_db_names_in_gcp()
  File "/Users/asnimansari/Desktop/tradestation/ares/helpers/gcp.py", line 29, in get_db_names_in_gcp
    donwload_object(bobu)
  File "/Users/asnimansari/Desktop/tradestation/ares/helpers/gcp.py", line 13, in donwload_object
    blob = storage_bucket.blob(download_obj_name)
  File "/Users/asnimansari/.pyenv/versions/3.9.4/lib/python3.9/site-packages/google/cloud/storage/bucket.py", line 688, in blob
    return Blob(
  File "/Users/asnimansari/.pyenv/versions/3.9.4/lib/python3.9/site-packages/google/cloud/storage/blob.py", line 205, in __init__
    name = _bytes_to_unicode(name)
  File "/Users/asnimansari/.pyenv/versions/3.9.4/lib/python3.9/site-packages/google/cloud/_helpers.py", line 389, in _bytes_to_unicode
    raise ValueError("%r could not be converted to unicode" % (value,))
ValueError: <Blob: tradeenginedata, quotes/quotes_2021-06-10.db, 1623310593606516> could not be converted to unicode

该文件是一个sqlite数据库。

Answer 1

我看到您已经打开了一个GitHub Issue link，并且云存储团队已经做出了响应。

正如他们所提到的，错误来自于您正在向storage_bucket.blob()传递无效字符串的事实。作为额外的见解，我们可以从错误中看到，实际上传入的是Blob对象，而不是String。

因此，请确保download_obj_name是有效的字符串，而不是Blob对象。

此外，您还必须更正download方法中的拼写错误，并注意额外的下划线。正确的方法是download_to_filename()，而不是download_to_file_name()。