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Forum Discussion
reading parquet file using python sdk
Hi, I am trying to read a parquet file using pandas and vaex. I can sucessfully read a .csv but I get the following error message when I try to download the parquet file with dbx.files_download : ...
Thanks for following up and sharing that. For reference, the URL parameters for shared links like that are documented here.
Greg-DB
Dropbox Staff
Dropbox StaffI see you're getting a 'not_file' error, which means: "We were expecting a file, but the given path refers to something that isn’t a file."
It looks like the ".parquet" is not a file, but rather a sort of folder, possibly referred to as a "package" or "bundle" in some environments.
That being the case, to download that you would instead need to use files_download_zip (or files_download_zip_to_file) and then unzip the downloaded zip file, or walk through the contents using files_list_folder/files_list_folder_continue and then download each individual nested item using files_download (or files_download_to_file). The first option of using files_download_zip is probably better/faster.
Thanks for replying. I have tried with one of your solutions but it's really slow.
file_list = []
for entry in dbx.files_list_folder(path="/County.parquet").entries:
print(entry.path_lower)
_, dwnld_file = dbx.files_download(entry.path_lower)
with io.BytesIO(dwnld_file.content) as stream:
pd_df = pd.read_parquet(stream) #this works
vdf = vaex.from_pandas(pd_df)
del pd_df
file_list.append(vdf)
conc_df = vaex.concat(file_list)
print(conc_df)I have tried with dbx.files_download_zip but I can't find a way to read the data it returns 'utf-8' codec can't decode byte 0x82 in position 12: invalid start byte.
- Greg-DB
Yes, using files_list_folder/files_list_folder_continue and files_download (or files_download_to_file) requires more API calls so it would be less performant.
The files_download_zip method would return the requested data the same way files_download would, except that it would be zip data that you would need to unzip to access the original folder. Also, note that you can use files_download_zip_to_file if you want to save the zip data to a file. Can you share the code you're having trouble with for that, and indicate which line fails with that error?
When I try:
md, zipFile = dbx.files_download_zip('/County_test.parquet')
with ZipFile(zipFile, 'r') as zip:with ZipFile(zipFile, 'r') as zip: fails with AttributeError: 'Response' object has no attribute 'seek'
I can't understand how to solve this
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