Should pipenv install -i suppress --pypi_mirror

[mlouielu]

Issue description

Should pipenv install -i suppress --pypi_mirror

When using pip install -i https://foo six it will suppress default pypi URL

➜  p pip install -i https://foo six
Looking in indexes: https://foo
Requirement already satisfied: six in /usr/lib/python3.6/site-packages (1.11.0)
You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

But at pipenv install -i https://foo six, it will also using pypi_mirror:

➜  p pipenv install -i https://foo six
Installing six…
Looking in indexes: https://foo, https://pypi.org/simple
Requirement already satisfied: six in /home/louie/.local/share/virtualenvs/p-iGimN7tB/lib/python3.6/site-packages (1.11.0)

Adding six to Pipfile's [packages]…
Pipfile.lock (3cae52) out of date, updating to (d8ade3)…
Locking [dev-packages] dependencies…
Locking [packages] dependencies…
Updated Pipfile.lock (d8ade3)!
Installing dependencies from Pipfile.lock (d8ade3)…
  🐍   ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 2/2 — 00:00:00

Do this behavior need to changed?

Expected result

As pip, or remain the same.

Actual result

When possible, provide the verbose output (--verbose), especially for locking and dependencies resolving issues.

Steps to replicate

$ pipenv install -i https://foo six

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[uranusjr]

I would say no, if you want to replace PyPI specifically, use --pypi-mirror; if you use -i, it adds an additional mirror alongside PyPI. This covers all common use cases.

[mlouielu]

So in pipenv, the result of -i and --extra-index-url should have the same, but --extra-index-url allow multiple input, -i will only use the last input, right?

[techalchemy]

No. Also see #2494. Please don’t open multiple of the same issue (ref: #2637)