fix whitespace indentation for PEP-8 conformity

nltk/__init__.py

@@ -98,11 +98,11 @@ except ImportError:
 import subprocess
 if not hasattr(subprocess, 'PIPE'):
     def _fake_PIPE(*args, **kwargs):
-      raise NotImplementedError('subprocess.PIPE is not supported.')
+        raise NotImplementedError('subprocess.PIPE is not supported.')
     subprocess.PIPE = _fake_PIPE
 if not hasattr(subprocess, 'Popen'):
     def _fake_Popen(*args, **kwargs):
-      raise NotImplementedError('subprocess.Popen is not supported.')
+        raise NotImplementedError('subprocess.Popen is not supported.')
     subprocess.Popen = _fake_Popen
 
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