Implement flake8-2020 (sys.version, sys.version_info misuse) (#688)

resources/test/fixtures/YTT101.py

@@ -0,0 +1,13 @@
+import sys
+from sys import version, version as v
+
+print(sys.version)
+
+print(sys.version[:3])
+print(version[:3])
+
+# ignore from imports with aliases, patches welcome
+print(v[:3])
+# the tool is timid and only flags certain numeric slices
+i = 3
+print(sys.version[:i])

resources/test/fixtures/YTT102.py

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+import sys
+from sys import version
+
+py_minor = sys.version[2]
+py_minor = version[2]

resources/test/fixtures/YTT103.py

@@ -0,0 +1,8 @@
+import sys
+from sys import version
+
+version < "3.5"
+sys.version < "3.5"
+sys.version <= "3.5"
+sys.version > "3.5"
+sys.version >= "3.5"

resources/test/fixtures/YTT201.py

@@ -0,0 +1,10 @@
+import sys
+from sys import version_info
+
+print("{}.{}".format(*sys.version_info))
+PY3 = sys.version_info[0] >= 3
+
+PY3 = sys.version_info[0] == 3
+PY3 = version_info[0] == 3
+PY2 = sys.version_info[0] != 3
+PY2 = version_info[0] != 3

resources/test/fixtures/YTT202.py

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+import six
+from six import PY3
+
+if six.PY3:
+    print("3")
+if PY3:
+    print("3")

resources/test/fixtures/YTT203.py

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+import sys
+from sys import version_info
+
+sys.version_info[1] >= 5
+version_info[1] < 6

resources/test/fixtures/YTT204.py

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+import sys
+from sys import version_info
+
+sys.version_info.minor <= 7
+version_info.minor > 8

resources/test/fixtures/YTT301.py

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+import sys
+from sys import version
+
+py_major = sys.version[0]
+py_major = version[0]

resources/test/fixtures/YTT302.py

@@ -0,0 +1,8 @@
+import sys
+from sys import version
+
+version < "3"
+sys.version < "3"
+sys.version <= "3"
+sys.version > "3"
+sys.version >= "3"

resources/test/fixtures/YTT303.py

@@ -0,0 +1,5 @@
+import sys
+from sys import version
+
+print(sys.version[:1])
+print(version[:1])