fixes ERROR: Inconsistent literal block quoting. PEP8 fixes

Author: oesteban

nipype/interfaces/fsl/possum.py

@@ -10,7 +10,6 @@
   .. Note:: This was written to work with FSL version 5.0.6.
 
   .. testsetup::
-
     # Change directory to provide relative paths for doctests
     import os
     filepath = os.path.dirname( os.path.realpath( __file__ ) )
@@ -30,32 +29,33 @@ class B0CalcInputSpec(FSLCommandInputSpec):
                     name_template='%s_b0field', output_name='out_file',
                     desc='filename of B0 output volume')
 
+    x_grad = traits.Float(0.0, argstr='--gx=%0.4f',
+                          desc='Value for zeroth-order x-gradient field (per mm)')
+    y_grad = traits.Float(0.0, argstr='--gy=%0.4f',
+                          desc='Value for zeroth-order y-gradient field (per mm)')
+    z_grad = traits.Float(0.0, argstr='--gz=%0.4f',
+                          desc='Value for zeroth-order z-gradient field (per mm)')
 
-    x_grad = traits.Float(0.0, argstr='--gx=%0.4f', desc=('Value for zeroth-order x-gradient field '
-                          '(per mm)'))
-    y_grad = traits.Float(0.0, argstr='--gy=%0.4f', desc=('Value for zeroth-order y-gradient field '
-                          '(per mm)'))
-    z_grad = traits.Float(0.0, argstr='--gz=%0.4f', desc=('Value for zeroth-order z-gradient field '
-                          '(per mm)'))
-
-    x_b0 = traits.Float(0.0, argstr='--b0x=%0.2f', desc=('Value for zeroth-order b0 field '
-                        '(x-component), in Tesla'), xor=['xyz_b0'])
-    y_b0 = traits.Float(0.0, argstr='--b0y=%0.2f', desc=('Value for zeroth-order b0 field '
-                        '(y-component), in Tesla'), xor=['xyz_b0'])
-    z_b0 = traits.Float(1.0, argstr='--b0=%0.2f', desc=('Value for zeroth-order b0 field '
-                        '(z-component), in Tesla'), xor=['xyz_b0'])
+    x_b0 = traits.Float(0.0, argstr='--b0x=%0.2f', xor=['xyz_b0'],
+                        desc='Value for zeroth-order b0 field (x-component), in Tesla')
+    y_b0 = traits.Float(0.0, argstr='--b0y=%0.2f', xor=['xyz_b0'],
+                        desc='Value for zeroth-order b0 field (y-component), in Tesla')
+    z_b0 = traits.Float(1.0, argstr='--b0=%0.2f', xor=['xyz_b0'],
+                        desc='Value for zeroth-order b0 field (z-component), in Tesla')
 
     xyz_b0 = traits.Tuple(
         traits.Float, traits.Float, traits.Float,
-        argstr='--b0x=%0.2f --b0y=%0.2f --b0=%0.2f', xor=['x_b0','y_b0','z_b0'],
+        argstr='--b0x=%0.2f --b0y=%0.2f --b0=%0.2f', xor=['x_b0', 'y_b0', 'z_b0'],
         desc='Zeroth-order B0 field in Tesla')
 
-    delta = traits.Float(-9.45e-6, argstr='-d %e', desc='Delta value (chi_tissue - chi_air)')
-    chi_air = traits.Float(4.0e-7, argstr='--chi0=%e', desc='susceptibility of air')
+    delta = traits.Float(-9.45e-6, argstr='-d %e',
+                         desc='Delta value (chi_tissue - chi_air)')
+    chi_air = traits.Float(
+        4.0e-7, argstr='--chi0=%e', desc='susceptibility of air')
     compute_xyz = traits.Bool(False, argstr='--xyz',
                               desc='calculate and save all 3 field components (i.e. x,y,z)')
-    extendboundary = traits.Float(1.0, argstr='--extendboundary=%0.2f', desc=('Relative proportion to '
-                                  'extend voxels at boundary'))
+    extendboundary = traits.Float(1.0, argstr='--extendboundary=%0.2f',
+                                  desc='Relative proportion to extend voxels at boundary')
     directconv = traits.Bool(False, argstr='--directconv',
                              desc='use direct (image space) convolution, not FFT')
 
@@ -65,13 +65,15 @@ class B0CalcOutputSpec(TraitedSpec):
 
 
 class B0Calc(FSLCommand):
+
     """
     B0 inhomogeneities occur at interfaces of materials with different magnetic susceptibilities,
     such as tissue-air interfaces. These differences lead to distortion in the local magnetic field,
     as Maxwell’s equations need to be satisfied. An example of B0 inhomogneity is the first volume
     of the 4D volume ```$FSLDIR/data/possum/b0_ppm.nii.gz```.
 
-    Examples ::
+    Examples
+    --------
 
     >>> from nipype.interfaces.fsl import B0Calc
     >>> b0calc = B0Calc()
@@ -85,5 +87,3 @@ class B0Calc(FSLCommand):
     _cmd = 'b0calc'
     input_spec = B0CalcInputSpec
     output_spec = B0CalcOutputSpec
-
-