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  • Reading rows from a file => AttributeError: '_io.StringIO' object has no attribute 'readinto' · 1 ✖

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  • CONTRIBUTOR · 1 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
1297703307 https://github.com/simonw/sqlite-utils/issues/448#issuecomment-1297703307 https://api.github.com/repos/simonw/sqlite-utils/issues/448 IC_kwDOCGYnMM5NWWGL mcarpenter 167893 2022-10-31T21:23:51Z 2022-10-31T21:27:32Z CONTRIBUTOR

The Windows aspect is a red herring: OP's sample above produces the same error on Linux. (Though I don't know what's going on with the CI).

The same error can also be obtained by passing an io from a file opened in non-binary mode ('r' as opposed to 'rb') to rows_from_file(). This is how I got here.

The fix for my case is easy: open the file in mode 'rb'. The analagous fix for OP's problem also works: use BytesIO in place of StringIO.

Minimal test case (derived from utils.py):

``` python import io from typing import cast

fp = io.StringIO("id,name\n1,Cleo") # error

fp = io.BytesIO(bytes("id,name\n1,Cleo", encoding='utf-8')) # okay reader = io.BufferedReader(cast(io.RawIOBase, fp)) reader.peek(1) # exception thrown here `` I see the signature ofrows_from_file()correctly hasfp: BinaryIObut I guess you'd need either a runtime type check for that (not allios havemode()), or to catch theAttributeErroronpeek()` to produce a better error for users. Neither option is ideal.

Some thoughts on testing binary-ness of ios in this SO question: https://stackoverflow.com/questions/44584829/how-to-determine-if-file-is-opened-in-binary-or-text-mode

 
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 Reading rows from a file => AttributeError: '_io.StringIO' object has no attribute 'readinto' 1279144769  

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