The emails informing me of replies had gone to spam :-(
Thank you very much.
Searching on Electrum doc, I also finded this:
http://docs.electrum.org/en/latest/faq.html#how-can-i-pre-generate-new-addresses = If you wish to generate more than one address, you can use a “for” loop. For example, if you wanted to generate 50 addresses, you could do this:
for x in range(0, 50): print wallet.create_new_address(False)
> Does it mean the first 50 addresses of the wallet? Or "just" generate 50 new addresses?
I also found something interesting: increase the gap limit.
You can of course force either wallet to generate addresses. The easiest way is to change the gap limit to a higher value. You should read about the gap limit to understand what it means. In short, it's the number of consecutive unused addresses the wallet will generate until it stops looking for transactions. By default, it is 20.
If you increase the gap limit, and actually create "gaps" larger than the default gap limit, you will need to increase the gap limit after you restore from seed again; otherwise some coins will not be found!
Go into the Console tab (View>Show Console), and type:
wallet.change_gap_limit(100)
So I can see 100 addresses or more.
> Do you know how to easily copy all (or selected) addresses (in the clipboard)?
For me it seems to be a better solution: I get as much addresses I want BUT ALSO increase the gap limit (as I'm afraid it will be a problem with my business).