Firstly, why is it even sending them an email? Since they'll be running the .exe, it can pop up a window and offer to save the file. If an email must be sent, it can be from the user's gmail rather than yours.

Secondly, using your gmail account in this way may be against the terms of service. You could get your account suspended, and it may technically be a felony in the US. Consult a lawyer if this is a concern.

To your question, there's basically no way to obfuscate the password that will be more than a mild annoyance to anyone with the least interest. At the end of the day, (a) the script runs under the control of the user, potentially in a VM or a container, potentially with network communications captured; and (b) at some point it has to decrypt and send the password. Decoding and following either the script, or the network communications that it makes will be relatively straightforward for anyone who wants to put in quite modest effort.
I'm making a simple project where I will have a downloadable scraper on an HTML website. The scraper is made in Python and is converted to a .exe file for downloading purposes. Inside the python code, however, I included a Google app password to an email account, because the scraper sends an email and I need the server to login with an available Google account. Whilst .exe files are hard to get source code for, I've seen that there are ways to do so, and I'm wondering, how could I make it so that anyone who has downloaded the scraper.exe file cannot see the email login details that I will be using to send them an email when the scraper needs to? If possible, maybe even block them from accessing any of the .exe source code or bytecode altogether? I'm using the Python libraries bs4 and requests.
Additionally, this is off-topic, however, as it is my first time developing a downloadable file, even whilst converting the Python file to a .exe file, my antivirus picked it up as a suspicious file. This is like a 50 line web scraper and obviously doesn't have any malicious code within it. How can I make the code be less suspicious to antivirus programs?
Python exe - how can I restrict viewing source and byte code?