Read this and you will see why it is a bad idea. I get it, passwords are hard to remember when you have lots of them or you change them a lot. But the disturbing thing here is that of this 1.4 Billion passwords, many are still active as the authors discovered.
Also, remember to check periodically if your passwords etc. have been stolen and posted online: https://haveibeenpwned.com/
Collection of 1.4 Billion Plain-Text Leaked Passwords Found Circulating Online
https://thehackernews.com/2017/12/data-breach-password-list.html