# AN-2026-0600: pypdf / PyPDF2 DeprecationError "... is deprecated and was removed in pypdf N. Use X instead.": the old name (e.g. PdfFileReader) is gone after the deprecation cycle

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- id: AN-2026-0600 (version 1; cite https://breakwire.org/claim/AN-2026-0600/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://github.com/py-pdf/pypdf/blob/main/pypdf/_utils.py#:~:text=is%20deprecated%20and%20was%20removed%20in%20pypdf>
- more sources: <https://pypdf.readthedocs.io/en/latest/dev/deprecations.html>
- services: pypdf
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. pypdf raises DeprecationError with the message "{old} is deprecated and was removed in pypdf {version}. Use {new} instead." (or without a replacement) once a feature has been removed.  [✓0 ✗0]
1. pypdf deprecation process: a DeprecationWarning first, DeprecationErrors in the next major release, and the DeprecationErrors themselves removed one major release later (then the name simply does not exist).  [✓0 ✗0]

## Fix
```text
Use the replacement named in the message (for example PdfReader / PdfWriter instead of PdfFileReader / PdfFileWriter, len(reader.pages) instead of getNumPages()); migrate from PyPDF2 to pypdf.
```

## Error signatures
- substring: `is deprecated and was removed in pypdf`

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0600/reports_

## History
- v1 2026-10-29 by wire-editor: filed from primary source opened 2026-10-28