Rebuild for python39

.ci_support/linux_python3.6.yaml → .ci_support/linux_64_python3.6.____cpython.yaml

@@ -9,4 +9,6 @@ pin_run_as_build:
     min_pin: x.x
     max_pin: x.x
 python:
-- '3.6'
+- 3.6.* *_cpython
+target_platform:
+- linux-64

.ci_support/linux_python3.7.yaml → .ci_support/linux_64_python3.7.____cpython.yaml

@@ -9,4 +9,6 @@ pin_run_as_build:
     min_pin: x.x
     max_pin: x.x
 python:
-- '3.7'
+- 3.7.* *_cpython
+target_platform:
+- linux-64

.ci_support/linux_python3.8.yaml → .ci_support/linux_64_python3.8.____cpython.yaml

@@ -9,4 +9,6 @@ pin_run_as_build:
     min_pin: x.x
     max_pin: x.x
 python:
-- '3.8'
+- 3.8.* *_cpython
+target_platform:
+- linux-64

.ci_support/linux_64_python3.9.____cpython.yaml

@@ -0,0 +1,14 @@
+channel_sources:
+- conda-forge,defaults
+channel_targets:
+- conda-forge main
+docker_image:
+- condaforge/linux-anvil-comp7
+pin_run_as_build:
+  python:
+    min_pin: x.x
+    max_pin: x.x
+python:
+- 3.9.* *_cpython
+target_platform:
+- linux-64

.ci_support/migrations/python39.yaml

@@ -0,0 +1,26 @@
+migrator_ts: 1602104489
+__migrator:
+    migration_number: 2
+    operation: key_add
+    primary_key: python
+    ordering:
+        python:
+            - 3.6.* *_cpython
+            - 3.7.* *_cpython
+            - 3.8.* *_cpython
+            - 3.9.* *_cpython   # new entry
+            - 3.6.* *_73_pypy
+    paused: false
+    pr_limit: 50
+    exclude:
+      # this shouldn't attempt to modify the python feedstocks
+      - python
+      - pypy3.6
+      - pypy-meta
+python:
+  - 3.9.* *_cpython
+# additional entries to add for zip_keys
+numpy:
+  - 1.19
+python_impl:
+  - cpython