Fix broken format_node due to missing inspect import.

nipype/pipeline/engine/base.py

@@ -15,6 +15,8 @@
 
 """
 
+from __future__ import absolute_import
+
 from future import standard_library
 standard_library.install_aliases()
 from builtins import object

nipype/pipeline/engine/nodes.py

@@ -15,6 +15,8 @@
 
 """
 
+from __future__ import absolute_import
+
 from future import standard_library
 standard_library.install_aliases()
 from builtins import range

nipype/pipeline/engine/utils.py

@@ -5,6 +5,8 @@
 """Utility routines for workflow graphs
 """
 
+from __future__ import absolute_import
+
 from future import standard_library
 standard_library.install_aliases()
 
@@ -22,6 +24,10 @@
 from copy import deepcopy
 from glob import glob
 from collections import defaultdict
+try:
+    from inspect import signature
+except ImportError:
+    from funcsigs import signature
 import os
 import re
 import numpy as np
@@ -115,15 +121,17 @@ def _write_inputs(node):
 
 def format_node(node, format='python', include_config=False):
     """Format a node in a given output syntax."""
+    from .nodes import MapNode
     lines = []
     name = node.fullname.replace('.', '_')
     if format == 'python':
         klass = node._interface
         importline = 'from %s import %s' % (klass.__module__,
                                             klass.__class__.__name__)
         comment = '# Node: %s' % node.fullname
-        spec = inspect.signature(node._interface.__init__)
-        args = spec.args[1:]
+        spec = signature(node._interface.__init__)
+        args = [p.name for p in spec.parameters.values()]
+        args = args[1:]
         if args:
             filled_args = []
             for arg in args:

nipype/pipeline/engine/workflows.py

@@ -15,6 +15,8 @@
 
 """
 
+from __future__ import absolute_import
+
 from future import standard_library
 standard_library.install_aliases()
 from builtins import range