Twine is asking for my password each time : how to use the .pypirc

I have pip installed pypirc and set up a ~/.pypirc file with the requisite password. Why is twine asking for a password each time python setup.py is invoked?

  $twine upload --repository-url https://test.pypi.org/legacy/ dist/*
  Enter your username:

Here is the form of the .pypirc

[distutils] # this tells distutils what package indexes you can push to
index-servers =
  pypi
  pypitest

[pypi]
repository: https://pypi.python.org/pypi
username: myuser 
password: mypwd 

[pypitest]
repository: https://testpypi.python.org/pypi
username: myuser 
password: mypwd

Update Not including the --repository-url gives:

UploadToDeprecatedPyPIDetected: You're trying to upload to the legacy PyPI site 'https://pypi.python.org/pypi'. Uploading to those sites is deprecated.
 The new sites are pypi.org and test.pypi.org. Try using https://upload.pypi.org/legacy/ (or https://test.pypi.org/legacy/) to upload your packages instead. These are the default URLs for Twine now.
 More at https://packaging.python.org/guides/migrating-to-pypi-org/ .

Solution

twine upload dist/*

twine upload -r pypi dist/*

twine upload -r pypitest dist/*

As far as I understand twine --repository-url <url> doesn't even consult ~/.pypirc. With -r <name> it lookups ~/.pypirc for the URL, user name and password. If you omit -r <name>, twine uses the first repo from ~/.pypirc.