complain about missing space before opening parentheses of import statement

Solves issue PyCQA#489

Author: rogalski

docs/intro.rst

@@ -331,6 +331,8 @@ This is the current list of error and warning codes:
 +------------+----------------------------------------------------------------------+
 | E402       | module level import not at top of file                               |
 +------------+----------------------------------------------------------------------+
+| E403       | missing whitespace after import statement                            |
++------------+----------------------------------------------------------------------+
 +------------+----------------------------------------------------------------------+
 | **E5**     | *Line length*                                                        |
 +------------+----------------------------------------------------------------------+

pep8.py

@@ -855,6 +855,21 @@ def imports_on_separate_lines(logical_line):
             yield found, "E401 multiple imports on one line"
 
 
+def missing_whitespace_after_import_statement(logical_line):
+    r"""Multiple imports in form from x import (a, b, c) should have space
+    between import statement and parenthesised name list.
+
+    Okay: from foo import (bar, baz)
+    E403: from foo import(bar, baz)
+    E403: from fake.importable.module import(bar, baz)
+    """
+    line = logical_line
+    if line.startswith('from '):
+        found = line.find(' import')
+        if -1 < found and line[found + len(" import")] == "(":
+            yield found, "E403 missing whitespace after import statement"
+
+
 def module_imports_on_top_of_file(
         logical_line, indent_level, checker_state, noqa):
     r"""Imports are always put at the top of the file, just after any module

testsuite/E40.py

@@ -36,3 +36,15 @@
 a = 1
 
 import bar
+#: Okay
+from u import (a, b)
+from v import c, d
+#: E403
+from w import(e, f)
+#: E403
+from fake.importable.module import(e, f)
+#: E403
+try:
+    from fake.importable.module import(e, f)
+except ImportError:
+    pass