No timezone in key UTC

[homer0825]

First of all, Thank you for creating a very wonderful and useful package. I am very new to python and just discovering it's capabilities.

I am using program to send a simple email. program runs correctly using pycharm and i am able to receive it but when I convert it to EXE and run it, I am getting an error - No timezone found with key UTC. Any suggestions? I apologize in advance if this has been answered already but tried searching and i am unable to find the solution

[ecederstrand]

Thanks for the kind words! I'm glad you like exchangelib.

Can you please post the full stack trace you get when you run the exe file?

[homer0825]

HI, Very new at this.

Here is the stack trace i get in process explorer when i run the exe

ntoskrnl.exe!KeSynchronizeExecution+0x5b46
ntoskrnl.exe!KeWaitForSingleObject+0x1c2d
ntoskrnl.exe!KeWaitForSingleObject+0xab4
ntoskrnl.exe!KeWaitForSingleObject+0x255
ntoskrnl.exe!ExTryQueueWorkItem+0x1407
ntoskrnl.exe!KeWaitForSingleObject+0x3828
ntoskrnl.exe!KeWaitForSingleObject+0x1cc8
ntoskrnl.exe!KeWaitForSingleObject+0xab4
ntoskrnl.exe!KeWaitForSingleObject+0x255
ntoskrnl.exe!NtWaitForSingleObject+0x10b
ntoskrnl.exe!setjmpex+0x7bf5
ntdll.dll!NtWaitForSingleObject+0x14
KERNELBASE.dll!WaitForSingleObjectEx+0x93
test email.exe+0x53ef
test email.exe+0x30d8
test email.exe+0x903e
KERNEL32.DLL!BaseThreadInitThunk+0x14
ntdll.dll!RtlUserThreadStart+0x21

[ecederstrand]

That's a problem coming from the Python zoneinfo package. It doesn't look like it's specific to exchangelib. You would probably get the same if your exe file just contained:

from zoneinfo import ZoneInfo
utc = ZoneInfo('UTC')

I have no idea what the problem could be, unfortunately. Maybe your Windows system is missing timezone information, or maybe Python doesn't have access to the timezone information when run as an exe.

[ecederstrand]

Actually, looking at e.g. https://realpython.com/python39-new-features/#accessing-time-zones it looks like the tzdata package, or the data installed by the tzdata package, is missing in the exe file. At least that gives the No time zone found with key error you see.

I haven't worked with packaging to exe before, so I don't know how to solve this problem.

[homer0825]

Understood. Thank you for pointing me in the right direction. I will let you know just in case i find out more.

[ecederstrand]

A workaround is discussed in https://stackoverflow.com/questions/67711882/exchangelib-and-pyinstaller-zoneinfo-tzdata-utc-issue