install: remove need to name [esp]

Simplify install to just `pip install django-anymail`.
(Rather than `... django-anymail[mailgun]`

All of the ESPs so far require requests, so just move
that into the base requirements. (Chances are your
Django app already needs requests for some other
reason, anyway.)

Truly unique ESP dependencies (e.g., boto for
AWS-SES) could still use the setup extra features
mechanism.

.travis.yml

@@ -33,8 +33,6 @@ cache:
 install:
   - pip install --upgrade setuptools pip
   - pip install $DJANGO
-  # For now, install all ESPs and test at once
-  # (in future, might want to matrix ESPs to test cross-dependencies)
-  - pip install .[mailgun,mandrill,sendgrid]
+  - pip install .
   - pip list
 script: python -Wall setup.py test

README.rst

@@ -72,11 +72,11 @@ Anymail 1-2-3
 This example uses Mailgun, but you can substitute Postmark or SendGrid
 or any other supported ESP where you see "mailgun":
 
-1. Install Anymail from PyPI, including the ESP(s) you want to use:
+1. Install Anymail from PyPI:
 
    .. code-block:: console
 
-        $ pip install django-anymail[mailgun]  # or [postmark,sendgrid] or ...
+        $ pip install django-anymail
 
 
 2. Edit your project's ``settings.py``:

anymail/backends/base_requests.py

@@ -1,18 +1,13 @@
 import json
 
+import requests
 # noinspection PyUnresolvedReferences
 from six.moves.urllib.parse import urljoin
 
 from .base import AnymailBaseBackend, BasePayload
-from ..exceptions import AnymailImproperlyInstalled, AnymailRequestsAPIError, AnymailSerializationError
+from ..exceptions import AnymailRequestsAPIError, AnymailSerializationError
 from .._version import __version__
 
-try:
-    # noinspection PyUnresolvedReferences
-    import requests
-except ImportError:
-    raise AnymailImproperlyInstalled('requests')
-
 
 class AnymailRequestsBackend(AnymailBaseBackend):
     """

anymail/backends/sendgrid.py

@@ -1,17 +1,13 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.core.mail import make_msgid
+from requests.structures import CaseInsensitiveDict
 
-from ..exceptions import AnymailImproperlyInstalled, AnymailRequestsAPIError
+from ..exceptions import AnymailRequestsAPIError
 from ..message import AnymailRecipientStatus
 from ..utils import get_anymail_setting, timestamp
 
 from .base_requests import AnymailRequestsBackend, RequestsPayload
 
-try:
-    # noinspection PyUnresolvedReferences
-    from requests.structures import CaseInsensitiveDict
-except ImportError:
-    raise AnymailImproperlyInstalled('requests', backend="sendgrid")
 
 
 class SendGridBackend(AnymailRequestsBackend):

anymail/exceptions.py

@@ -1,14 +1,7 @@
 import json
 
 from django.core.exceptions import ImproperlyConfigured
-
-try:
-    from requests import HTTPError
-except ImportError:
-    # Backends that don't use requests aren't required to have it installed
-    # (and could never raise an AnymailRequestsAPIError)
-    class HTTPError(Exception):
-        pass
+from requests import HTTPError
 
 
 class AnymailError(Exception):

docs/installation.rst

@@ -6,24 +6,14 @@ Installation and configuration
 Installing Anymail
 ------------------
 
-Install Anymail from PyPI using pip.
-
-Anymail uses python setuptools' "extra features" to pull in dependencies
-for specific ESPs. (This avoids installing packages needed by ESPs
-you aren't using.)
-
-You'll want to include at least one ESP as an extra in your pip command.
-E.g., for Anymail with Mailgun support:
+It's easiest to install Anymail from PyPI using pip.
 
     .. code-block:: console
 
-        $ pip install django-anymail[mailgun]
+        $ pip install django-anymail
 
-...or with both Postmark and SendGrid support:
-
-    .. code-block:: console
-
-        $ pip install django-anymail[postmark,sendgrid]
+If you don't want to use pip, you'll also need to install Anymail's
+dependencies (requests and six).
 
 
 .. _backend-configuration:

docs/troubleshooting.rst

@@ -19,18 +19,15 @@ Figuring out what's wrong
 
 **Check your ESPs API logs**
 
-  Many ESPs offer an incredibly-helpful log
-  of your recent API calls in their dashboards. Check the logs to see if the
+  Most ESPs offer some sort of API activity log in their dashboards.
+  Check the logs to see if the
   data you thought you were sending actually made it to your ESP, and
   if they recorded any errors there.
 
 **Double-check common issues**
 
-  * Did you install Anymail with the ESPs you want available?
-    (E.g., `pip install django-anymail[mailgun,sendgrid]` --
-    *not* just `pip install django-anymail`.)
-  * Did you add any required settings for those ESPs to your settings.py?
-    (E.g., `ANYMAIL_MANDRILL_API_KEY`.)
+  * Did you add any required settings for your ESP to your settings.py?
+    (E.g., `ANYMAIL_SENDGRID_API_KEY` for SendGrid.) See :ref:`supported-esps`.
   * Did you add ``'anymail'`` to the list of :setting:`INSTALLED_APPS` in settings.py?
   * Are you using a valid from address? Django's default is "webmaster@localhost",
     which won't cut it. Either specify the ``from_email`` explicitly on every message

setup.py

@@ -31,11 +31,15 @@ setup(
     license="BSD License",
     packages=["anymail"],
     zip_safe=False,
-    install_requires=["django>=1.8", "six"],
+    install_requires=["django>=1.8", "requests>=2.4.3", "six"],
     extras_require={
-        "mailgun": ["requests>=2.4.3"],
-        "mandrill": ["requests>=1.0.0"],
-        "sendgrid": ["requests>=2.4.3"],
+        # This can be used if particular backends have unique dependencies
+        # (e.g., AWS-SES would want boto).
+        # For simplicity, requests is included in the base requirements.
+        "mailgun": [],
+        "mandrill": [],
+        "postmark": [],
+        "sendgrid": [],
     },
     include_package_data=True,
     test_suite="runtests.runtests",