gnu: Add python-pecan.

* gnu/packages/python-web.scm (python-pecan): New variable.

gnu/packages/python-web.scm

@@ -5901,6 +5901,53 @@ Swagger.")
      "Manuel lets you mix and match traditional doctests with custom test syntax.")
     (license license:asl2.0)))
 
+(define-public python-pecan
+  (package
+    (name "python-pecan")
+    (version "1.4.1")
+    (source
+     (origin
+       (method git-fetch)               ;no tests in pypi release
+       (uri (git-reference
+             (url "https://github.com/pecan/pecan")
+             (commit version)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "10lz0cqafx3j24m52vv9ph0bxrzyx6wv2dgz7g9kfm60lhaskqkh"))))
+    (build-system python-build-system)
+    (arguments
+     (list
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-after 'unpack 'relax-requirements
+            (lambda _
+              (substitute* "test-requirements.txt"
+                ;; Drop extraneous virtualenv requirement.
+                ((".*virtualenv.*") ""))))
+          (replace 'check
+            (lambda* (#:key tests? #:allow-other-keys)
+              (when tests?
+                (invoke "pytest" "-vv" "pecan")))))))
+    (native-inputs
+     (list gunicorn
+           python-genshi
+           python-jinja2
+           python-pytest
+           python-sqlalchemy
+           uwsgi))
+    (propagated-inputs
+     (list python-logutils
+           python-mako
+           python-six
+           python-webob
+           python-webtest))
+    (home-page "http://github.com/pecan/pecan")
+    (synopsis "WSGI object-dispatching web framework")
+    (description "This package provides a WSGI object-dispatching web
+framework, designed to be lean and fast, with few dependencies.")
+    (license license:bsd-3)))
+
 (define-public python-persistent
   (package
     (name "python-persistent")