@stephen All is fine now, thank you.

@cvp Great, It'works. Merci les amis ;-)

@stephen Thanks for the translation.

@stephen All is fine now, thank you.

@cvp Great, It'works. Merci les amis ;-)

@cvp OK, I'll check indentation

@cvp I think the errors occurs in line 147, after the loop. This cannot prevent the loop from executing three times.

@stephen and your code runs without errors ! Have you made some change other than translate ?

@stephen Thanks for the translation.

The code on Dropbox stops after one loop. Whith a breakpoint on line 141 and then step by step you will see that the loop is executed only one time, not three as expected. The name error comes because the bypass over the lines 143 and 144 where the variable 'numero_carre_sans_chiffre' is assigned.

@cvp you're right, but the bug remains on my iPad
It's strange that the same code runs without error on your device.
Thanks a lot to you and to @stephen

That 's correct, line 147 is still in the loop. But I 've commented lines 143 and 144 because the nameError and insert line 142 in order to debug. I don't need this print line in my script.
If you uncomment 143 and 144 and if the loop works fine, the name error would dissapear.
Wich version of Pythonista do you use? Mine is 3.3

here is full code :
https://www.dropbox.com/sh/puqht9zcmjfrzsh/AAA1_zJt1Kt0YFU3avW2dHeja?dl=0