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Issue in getting authenticated on bitbucket, using python script

I'm trying to get all project list from bit bucket, using username and app password. But getting 401 error.
I'm using atlasian python library for client connection, and below is the code.
bitbucket = Bitbucket(url='https://api.bitbucket.org',username="",password="")
data = bitbucket.project_list()
for data in data:
print(data)
Even tried with bitbucket user name and password still same.
Is there any way to generate key or something which can be used all the time not like oauth as it has expiration time.

You need to use App passwords as mentioned here
Using an app password
An app password is a substitute password for your user account, when authenticating with Bitbucket:
your Bitbucket username (not email) which can be found in the settings
the app password

How can I send email through python script when my company email is hosted on Google

Just like many big companies using Office365, my company is using google (gsuite) to host their email domain. I need to send automated emails to multiple people within organisation using a python script. How can that be done?

You can use a 3rd party service like Mailgun, it provides a REST API which if you hit you can trigger emails that it will send from a custom domain you configure on the service.
Its super easy to use for python, I use it for Raspberry Pi projects.
def send_simple_message():
return requests.post(
"https://api.mailgun.net/v3/YOUR_DOMAIN_NAME/messages",
auth=("api", "YOUR_API_KEY"),
data={"from": "Excited User <mailgun#YOUR_DOMAIN_NAME>",
"to": ["bar#example.com", "YOU#YOUR_DOMAIN_NAME"],
"subject": "Hello",
"text": "Testing some Mailgun awesomness!"})
It is a nice alternative to using a corporate SMTP server.

Got it fixed.
In order to send an email from Python, we first need to switch ON "Less secure app access" https://myaccount.google.com/lesssecureapps?utm_source=google-account&utm_medium=web.
This we need to do if we don't have 2 Factor Authentication.
If you use 2 Factor Authentication, then you need to create an App Password and use that particular password while sending an email and not your regular password.
To create an App Password use this link: https://support.google.com/mail/answer/185833?hl=en
Now using sample script like below, we can send an email.
import smtplib
# creates SMTP session
s = smtplib.SMTP('smtp.gmail.com', 587)
# start TLS for security
s.starttls()
# Authentication
s.login("username#domain.com", "app_password")
# message to be sent
message = "Message_you_need_to_send"
# sending the mail
s.sendmail("username#domain.com", "recipient#domain.com", message)
# terminating the session
s.quit()

Google provides Gmail api suite for python and it is the preferred way to access versus smtp login/password
You should refer to their developer console for examples and tutorials

Python machine-to-machine user level jwt authentication with box

My Python script needs to push files to Box every night, unattended. I've been reading as much as I can find about how machine-to-machine user-level authentication with Box in Python works, but I can't find any examples of performing the actual authentication in a Python script.
I found out how to encode what Box requires as a JWT payload here: JWT Claims. But, how do I use this JWT once I have it?
There is a very suggestive paragraph in the Box documentation about getting a user access token (JWT Authentication):
Your service will authenticate to Box by sending a JSON Web Token to the /token endpoint containing a JSON payload that includes the Client ID, enterprise_id or user_id, and additional claims, and sign it using the private key of an RSA keypair. Box then verifies the identity of your application using the public key specific to your application.
The problem is, I can't find any reference that tells me how to use the JWT once I have it. I'm pretty sure I make some call to https://api.box.com/oauth2/token, but how do I sign it with the private key, and what is the exact way of sending it in Python? E.g. do I use pycurl, or something else?
Once I have an access token I am able to authenticate using OAuth2, so that part is all right. There's just that piece in the middle I'm missing.
Please note I need to get a user token, not an enterprise-level token, so JWTAuth doesn't work for me.

You can do user-based authentication with JWTAUth. Instead of calling authenticate_instance, you use authenticate_app_user. Here is a code snippet:
from boxsdk import JWTAuth, Client
auth = JWTAuth(
client_id='CLIENT ID HERE',
client_secret='CLIENT SECRET HERE',
enterprise_id='USER_ID HERE',
jwt_key_id='JWT KEY HERE',
rsa_private_key_file_sys_path='PATH/TO/FILE',
rsa_private_key_passphrase=b'PASSPHRASE HERE'
)
access_token = auth.authenticate_app_user(type('',(object,),{"object_id": "USER_ID HERE"})())
client = Client(auth)
# ... etc
However, you still need to get your app authorized by a box admin for your enterprise.

Sending mail python webapp2 GAE

I initially tried using the smptlib library but in order to send an e-mail I need to use SSL which costs me with Google App Engine. Other than that, smtplib was a perfect solution.
I found a link here which explains how to send an email using the GAE API.
However, I can't seem to figure out how one would log in to a gmail account say, in order to send the email.
The purpose of this is to send a verification email to addresses of those who are registering. But in the link it shows how to get the current_user and send the email using their credentials. How would I explicitly enter an email, password, and smtp server like I would do with smtplib in order to send the email from my desired address.
Thanks for any answers!

You can't send from an arbitrary email address. As the overview docs state, you can only send from:
The Gmail or Google Apps Account of the user who is currently signed in
Any email address of the form anything#appname.appspotmail.com or anything#appalias.appspotmail.com
Any email address listed in Email API Authorized Senders found in the App Engine Settings page of the Developers Console
If you are the owner of the email account you want to send from, and it is a GMail account, you can add it to the Email API Authorized Senders list from the App Engine console.
Once that's done, you can just use it as the sender address - you don't need to log into anything.

Need to send a HTTP request in Python that'll authenticate with Google Accounts

I have an app which amounts to a Python script, running on the user's phone, and a JS client, running in the user's browser. The Python script sends messages to App Engine as HTTP requests. The server then pushes the messages to the JS client.
The problem is authentication: The server can easily use Google Accounts to authenticate anything coming from the JS client as being sent by a particular user, but I do not know how to get the Python script to make HTTP requests which will also authenticate.
Any ideas?

According to its homepage, httplib2 has support for Google Account authentication, maybe that may help you?

Can you use OAUth to authenticate with Google, then use the OAuth token to ensure the messages are legitimate?