Add test_future.py and associated files from CPython 3.9

Author: coolreader18

Lib/test/badsyntax_future10.py

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+from __future__ import absolute_import
+"spam, bar, blah"
+from __future__ import print_function

Lib/test/badsyntax_future3.py

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+"""This is a test"""
+from __future__ import nested_scopes
+from __future__ import rested_snopes
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+result = f(2)(4)

Lib/test/badsyntax_future4.py

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+"""This is a test"""
+import __future__
+from __future__ import nested_scopes
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+result = f(2)(4)

Lib/test/badsyntax_future5.py

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+"""This is a test"""
+from __future__ import nested_scopes
+import foo
+from __future__ import nested_scopes
+
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+result = f(2)(4)

Lib/test/badsyntax_future6.py

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+"""This is a test"""
+"this isn't a doc string"
+from __future__ import nested_scopes
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+result = f(2)(4)

Lib/test/badsyntax_future7.py

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+"""This is a test"""
+
+from __future__ import nested_scopes; import string; from __future__ import \
+     nested_scopes
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+result = f(2)(4)

Lib/test/badsyntax_future8.py

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+"""This is a test"""
+
+from __future__ import *
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+print(f(2)(4))

Lib/test/badsyntax_future9.py

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+"""This is a test"""
+
+from __future__ import nested_scopes, braces
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+print(f(2)(4))

Lib/test/future_test1.py

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+"""This is a test"""
+
+# Import the name nested_scopes twice to trigger SF bug #407394 (regression).
+from __future__ import nested_scopes, nested_scopes
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+result = f(2)(4)

Lib/test/future_test2.py

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+"""This is a test"""
+
+from __future__ import nested_scopes; import site
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+result = f(2)(4)