MAINT: A few python 3.7 fixes

Author: thequackdaddy

.travis.yml

@@ -33,6 +33,7 @@ matrix:
 
 # This disables sudo, but makes builds start much faster
 # See http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/
+sudo: false
 before_install:
   # Work around terrible pathological behaviour in OpenBLAS multithreading, that causes execution time to blow up from 3 minutes to 18 minutes, apparently in SVD on smallish matrices
   - export OMP_NUM_THREADS=1

patsy/constraint.py

@@ -10,7 +10,10 @@
 __all__ = ["LinearConstraint"]
 
 import re
-from collections import Mapping
+try:
+    from collections.abc import Mapping
+except ImportError:
+    from collections import Mapping
 import six
 import numpy as np
 from patsy import PatsyError

tools/check-API-refs.py

@@ -9,7 +9,7 @@
 root = dirname(dirname(abspath(__file__)))
 patsy_ref = root + "/doc/API-reference.rst"
 
-doc_re = re.compile("^\.\. (.*):: ([^\(]*)")
+doc_re = re.compile("^\\.\\. (.*):: ([^\\(]*)")
 def _documented(rst_path):
     documented = set()
     for line in open(rst_path):