python33.dll not found Error while using Python4Delphi component

Question

I'm working on a project with Python4Delphi component and also i want to use embedded version of python which is better to use as needs no installation. I've set the correct path and filename to python310.dll in the appropriate properties but no chance to run properly and always getting the

Error 87: Could not open Dll "python33.dll"

Python could not be properly initialized. We must quit.

i also added the directory of the dll to environment variables still no luck. whats wrong? (python and delphi 10.4 project both are 32bit versions, windows 10 64bit)

You write about using "python310.dll", but the error message is about a "python33.dll"!? — DelphiCoder
– DelphiCoder, Commented Oct 14, 2021 at 18:53
So then why do you think you need to provide a Python 3.10 DLL? Did you try to provide a Python 3.3 DLL? — DelphiCoder
– DelphiCoder, Commented Oct 15, 2021 at 6:52

George · Accepted Answer · 2023-02-18 13:10:24Z

1

just set the propery "UseLastKnownVersion" of PythonEngine Component to false, the "python33.dll not found " will disapper

answered Feb 18, 2023 at 13:10

George

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allan8araujo · Accepted Answer · 2021-12-31 10:40:27Z

0

I had the same issue. Reinstall python worked for me. But this time i maked sure that was installing the same architecture that i was compiling the code to. I reinstall python 3.10 on 32bits and worked for me, cuz i was compiling on win32

answered Dec 31, 2021 at 10:40

allan8araujo

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2 Comments

Burzum Over a year ago

This wasn't my case but this surely helps someone, Thanks mate.

David Moorhouse Over a year ago

That fixed it for me too. I had installed Python 64 bit, but was compiling my Delphi app EXE as 32 bit

S.B · Accepted Answer · 2022-01-16 15:51:55Z

-1

There is an error in pythonengine.pas. on line 9075 change

MinorVersion := PythonVersion[3];

to

MinorVersion := StrToInt(copy(PythonVersion, 3, length(PythonVersion) - 2));

the MinorVersion is incorrectly set to 1 for version 3.10.

edited Jan 16, 2022 at 15:51

S.B

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answered Jan 16, 2022 at 13:49

Ad Franse

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1 Comment

David Moorhouse Over a year ago

This does not appear to be the case in May 2022 (Python 3.10, and P4D from the current code base)

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