Add constraints for python3.6 too

.gitignore

@@ -89,8 +89,9 @@ venv3/
 venv2/
 ENV/
 env/
-env3/
 env2/
+env2?/
+env3/
 env3?/
 
 # Spyder project settings

bin/update_constraints.py

@@ -18,22 +18,15 @@ subprocess.check_call([
     '--upgrade',
     'cibuildwheel/resources/constraints.in',
 ])
-subprocess.check_call([
-    './env2/bin/pip-compile',
-    '--allow-unsafe',
-    '--generate-hashes',
-    '--upgrade',
-    'cibuildwheel/resources/constraints.in',
-    '--output-file', 'cibuildwheel/resources/constraints-python27.txt'
-])
-subprocess.check_call([
-    './env35/bin/pip-compile',
-    '--allow-unsafe',
-    '--generate-hashes',
-    '--upgrade',
-    'cibuildwheel/resources/constraints.in',
-    '--output-file', 'cibuildwheel/resources/constraints-python35.txt'
-])
+for python_version in ['27', '35', '36']:
+    subprocess.check_call([
+        f'./env{python_version}/bin/pip-compile',
+        '--allow-unsafe',
+        '--generate-hashes',
+        '--upgrade',
+        'cibuildwheel/resources/constraints.in',
+        '--output-file', f'cibuildwheel/resources/constraints-python{python_version}.txt'
+    ])
 
 Image = namedtuple('Image', [
     'manylinux_version',

cibuildwheel/resources/constraints-python27.txt

@@ -15,9 +15,10 @@ configparser==4.0.2 \
 contextlib2==0.6.0.post1 \
     --hash=sha256:01f490098c18b19d2bd5bb5dc445b2054d2fa97f09a4280ba2c5f3c394c8162e \
     --hash=sha256:3355078a159fbb44ee60ea80abd0d87b80b78c248643b49aa6d94673b413609b \
-    # via importlib-metadata, importlib-resources, virtualenv, zipp
+    # via importlib-metadata, importlib-resources, virtualenv
 delocate==0.8.0 \
-    --hash=sha256:ac9f4d8d28b2582d94f764db0d72a1fe3c42ab8212e9b780168455de385d5b95
+    --hash=sha256:ac9f4d8d28b2582d94f764db0d72a1fe3c42ab8212e9b780168455de385d5b95 \
+    # via -r cibuildwheel/resources/constraints.in
 distlib==0.3.0 \
     --hash=sha256:2e166e231a26b36d6dfe35a48c4464346620f8645ed0ace01ee31822b288de21 \
     # via virtualenv
@@ -57,7 +58,7 @@ singledispatch==3.4.0.3 \
 six==1.14.0 \
     --hash=sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a \
     --hash=sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c \
-    # via pathlib2, singledispatch, virtualenv
+    # via pathlib2, virtualenv
 typing==3.7.4.1 \
     --hash=sha256:91dfe6f3f706ee8cc32d38edbbf304e9b7583fb37108fef38229617f8b3eba23 \
     --hash=sha256:c8cabb5ab8945cd2f54917be357d134db9cc1eb039e59d1606dc1e60cb1d9d36 \
@@ -65,10 +66,12 @@ typing==3.7.4.1 \
     # via importlib-resources
 virtualenv==20.0.8 \
     --hash=sha256:0c04c7e8e0314470b4c2b43740ff68be1c62bb3fdef8309341ff1daea60d49d1 \
-    --hash=sha256:1f0369d068d9761b5c1ed7b44dad1ec124727eb10bc7f4aaefbba0cdca3bd924
+    --hash=sha256:1f0369d068d9761b5c1ed7b44dad1ec124727eb10bc7f4aaefbba0cdca3bd924 \
+    # via -r cibuildwheel/resources/constraints.in
 wheel==0.34.2 \
     --hash=sha256:8788e9155fe14f54164c1b9eb0a319d98ef02c160725587ad60f14ddc57b6f96 \
-    --hash=sha256:df277cb51e61359aba502208d680f90c0493adec6f0e848af94948778aed386e
+    --hash=sha256:df277cb51e61359aba502208d680f90c0493adec6f0e848af94948778aed386e \
+    # via -r cibuildwheel/resources/constraints.in, delocate
 zipp==1.2.0 \
     --hash=sha256:c70410551488251b0fee67b460fb9a536af8d6f9f008ad10ac51f615b6a521b1 \
     --hash=sha256:e0d9e63797e483a30d27e09fffd308c59a700d365ec34e93cc100844168bf921 \
@@ -77,7 +80,9 @@ zipp==1.2.0 \
 # The following packages are considered to be unsafe in a requirements file:
 pip==20.0.2 \
     --hash=sha256:4ae14a42d8adba3205ebeb38aa68cfc0b6c346e1ae2e699a0b3bad4da19cef5c \
-    --hash=sha256:7db0c8ea4c7ea51c8049640e8e6e7fde949de672bfa4949920675563a5a6967f
+    --hash=sha256:7db0c8ea4c7ea51c8049640e8e6e7fde949de672bfa4949920675563a5a6967f \
+    # via -r cibuildwheel/resources/constraints.in
 setuptools==44.0.0 \
     --hash=sha256:180081a244d0888b0065e18206950d603f6550721bd6f8c0a10221ed467dd78e \
-    --hash=sha256:e5baf7723e5bb8382fc146e33032b241efc63314211a3a120aaa55d62d2bb008
+    --hash=sha256:e5baf7723e5bb8382fc146e33032b241efc63314211a3a120aaa55d62d2bb008 \
+    # via -r cibuildwheel/resources/constraints.in

cibuildwheel/resources/constraints-python36.txt

@@ -0,0 +1,54 @@
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    bin/update_constraints
+#
+appdirs==1.4.3 \
+    --hash=sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92 \
+    --hash=sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e \
+    # via virtualenv
+delocate==0.8.0 \
+    --hash=sha256:ac9f4d8d28b2582d94f764db0d72a1fe3c42ab8212e9b780168455de385d5b95 \
+    # via -r cibuildwheel/resources/constraints.in
+distlib==0.3.0 \
+    --hash=sha256:2e166e231a26b36d6dfe35a48c4464346620f8645ed0ace01ee31822b288de21 \
+    # via virtualenv
+filelock==3.0.12 \
+    --hash=sha256:18d82244ee114f543149c66a6e0c14e9c4f8a1044b5cdaadd0f82159d6a6ff59 \
+    --hash=sha256:929b7d63ec5b7d6b71b0fa5ac14e030b3f70b75747cef1b10da9b879fef15836 \
+    # via virtualenv
+importlib-metadata==1.5.0 \
+    --hash=sha256:06f5b3a99029c7134207dd882428a66992a9de2bef7c2b699b5641f9886c3302 \
+    --hash=sha256:b97607a1a18a5100839aec1dc26a1ea17ee0d93b20b0f008d80a5a050afb200b \
+    # via importlib-resources, virtualenv
+importlib-resources==1.3.1 \
+    --hash=sha256:1dff36d42d94bd523eeb847c25c7dd327cb56686d74a26dfcc8d67c504922d59 \
+    --hash=sha256:7f0e1b2b5f3981e39c52da0f99b2955353c5a139c314994d1126c2551ace9bdf \
+    # via virtualenv
+six==1.14.0 \
+    --hash=sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a \
+    --hash=sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c \
+    # via virtualenv
+virtualenv==20.0.8 \
+    --hash=sha256:0c04c7e8e0314470b4c2b43740ff68be1c62bb3fdef8309341ff1daea60d49d1 \
+    --hash=sha256:1f0369d068d9761b5c1ed7b44dad1ec124727eb10bc7f4aaefbba0cdca3bd924 \
+    # via -r cibuildwheel/resources/constraints.in
+wheel==0.34.2 \
+    --hash=sha256:8788e9155fe14f54164c1b9eb0a319d98ef02c160725587ad60f14ddc57b6f96 \
+    --hash=sha256:df277cb51e61359aba502208d680f90c0493adec6f0e848af94948778aed386e \
+    # via -r cibuildwheel/resources/constraints.in, delocate
+zipp==3.1.0 \
+    --hash=sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b \
+    --hash=sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96 \
+    # via importlib-metadata, importlib-resources
+
+# The following packages are considered to be unsafe in a requirements file:
+pip==20.0.2 \
+    --hash=sha256:4ae14a42d8adba3205ebeb38aa68cfc0b6c346e1ae2e699a0b3bad4da19cef5c \
+    --hash=sha256:7db0c8ea4c7ea51c8049640e8e6e7fde949de672bfa4949920675563a5a6967f \
+    # via -r cibuildwheel/resources/constraints.in
+setuptools==45.2.0 \
+    --hash=sha256:316484eebff54cc18f322dea09ed031b7e3eb00811b19dcedb09bc09bba7d93d \
+    --hash=sha256:89c6e6011ec2f6d57d43a3f9296c4ef022c2cbf49bab26b407fe67992ae3397f \
+    # via -r cibuildwheel/resources/constraints.in