Merge branch 'fix-py37'

I tested this locally (on MacOS) against python3.7.0, and it now works. This
will appear broken on travis/appveyor until those CI environments add support
for py3.7 (but the failures should be ignored since py3.7 is in the
'allowed_failures' list).

closes #306

.appveyor.yml

@@ -18,6 +18,12 @@ environment:
     - PYTHON: "C:\\Python35-x64"
     - PYTHON: "C:\\Python36"
     - PYTHON: "C:\\Python36-x64"
+    - PYTHON: "C:\\Python37-x64"
+
+matrix:
+  allow_failures:
+    - PYTHON: "C:\\Python37-x64"
+      # appveyor does not yet install python-3.7
 
 install:
   - |

.travis.yml

@@ -12,6 +12,7 @@ python:
   - "3.4"
   - "3.5"
   - "3.6"
+  - "3.7"
   - "nightly"
 install:
   - pip install -U pip tox virtualenv codecov
@@ -27,4 +28,6 @@ after_success:
 matrix:
   allow_failures:
     - python: "3.3"
+      # travis doesn't support py3.7 yet
+    - python: "3.7"
     - python: "nightly"

src/wormhole/cli/cmd_receive.py

@@ -331,7 +331,14 @@ class Receiver:
         self._msg(u"%d files, %s (uncompressed)" %
                   (file_data["numfiles"], naturalsize(file_data["numbytes"])))
         self._ask_permission()
-        return tempfile.SpooledTemporaryFile()
+        f = tempfile.SpooledTemporaryFile()
+        # workaround for https://bugs.python.org/issue26175 (STF doesn't
+        # fully implement IOBase abstract class), which breaks the new
+        # zipfile in py3.7.0 that expects .seekable
+        if not hasattr(f, "seekable"):
+            # AFAICT all the filetypes that STF wraps can seek
+            f.seekable = lambda: True
+        return f
 
     def _decide_destname(self, mode, destname):
         # the basename() is intended to protect us against

src/wormhole/cli/cmd_send.py

@@ -314,6 +314,12 @@ class Sender:
             # We're sending a directory. Create a zipfile in a tempdir and
             # send that.
             fd_to_send = tempfile.SpooledTemporaryFile()
+            # workaround for https://bugs.python.org/issue26175 (STF doesn't
+            # fully implement IOBase abstract class), which breaks the new
+            # zipfile in py3.7.0 that expects .seekable
+            if not hasattr(fd_to_send, "seekable"):
+                # AFAICT all the filetypes that STF wraps can seek
+                fd_to_send.seekable = lambda: True
             num_files = 0
             num_bytes = 0
             tostrip = len(what.split(os.sep))

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = {py27,py34,py35,py36,pypy,flake8}
+envlist = {py27,py34,py35,py36,py37,pypy,flake8}
 skip_missing_interpreters = True
 minversion = 2.4.0