Merge pull request #11398 from Carreau/fix-input-docstring

Fix to allow entering docstring into IPython.

IPython/core/inputtransformer2.py

@@ -355,9 +355,14 b' class EscapedCommand(TokenTransformBase):'
         """Find the first escaped command (%foo, !foo, etc.) in the cell.
         """
         for line in tokens_by_line:
+            if not line:
+                continue
             ix = 0
-            while line[ix].type in {tokenize.INDENT, tokenize.DEDENT}:
+            ll = len(line)
+            while ll > ix and line[ix].type in {tokenize.INDENT, tokenize.DEDENT}:
                 ix += 1
+            if ix >= ll:
+                continue
             if line[ix].string in ESCAPE_SINGLES:
                 return cls(line[ix].start)
 

IPython/core/tests/test_inputtransformer2.py

@@ -233,6 +233,17 b' def test_check_complete():'
         for k in short:
             cc(c+k)
 
+def test_check_complete_II():
+    """
+    Test that multiple line strings are properly handled.
+
+    Separate test function for convenience
+
+    """
+    cc = ipt2.TransformerManager().check_complete
+    nt.assert_equal(cc('''def foo():\n    """'''), ('incomplete', 4))
+
+
 def test_null_cleanup_transformer():
     manager = ipt2.TransformerManager()
     manager.cleanup_transforms.insert(0, null_cleanup_transformer)