Add spacing to improve readability

mbtrack2/impedance/resistive_wall.py

@@ -79,7 +79,6 @@ class CircularResistiveWall(WakeField):
     [4] : Zotter, Bruno W., and Semyon A. Kheifets (1998). Impedances and wakes
     in high-energy particle accelerators. World Scientific.
 
-
     """
 
     def __init__(self,
@@ -168,7 +167,8 @@ class CircularResistiveWall(WakeField):
         if exact == True:
             idx2 = time == 0
             idx3 = np.logical_not(np.logical_or(idx1, idx2))
-            factor = self.Z0 * c / (3 * np.pi * self.radius**2) * self.length
+            factor = ( self.Z0 * c / (3 * np.pi * self.radius**2) *
+                       self.length )
             if np.any(idx2):
                 # fundamental theorem of beam loading
                 wl[idx2] = 3 * factor / 2
@@ -217,8 +217,9 @@ class CircularResistiveWall(WakeField):
         if exact == True:
             idx2 = time == 0
             idx3 = np.logical_not(np.logical_or(idx1, idx2))
-            factor = ( (self.Z0 * c**2 * self.t0) / (3 * np.pi * self.radius**4) *
-                  self.length )
+            factor = ( (self.Z0 * c**2 * self.t0) /
+                       (3 * np.pi * self.radius**4) *
+                       self.length )
             wt[idx3] = self.__TransWakeExact(time[idx3], factor)
         else:
             idx2 = np.logical_not(idx1)
@@ -226,22 +227,31 @@ class CircularResistiveWall(WakeField):
         return wt
 
     def __LongWakeExact(self, t, factor):
-        wl = np.real( factor * ( 4 * np.exp(-1 * t / self.t0)
-            * np.cos(np.sqrt(3) * t / self.t0)
-            + wofz(1j * np.sqrt(2 * t / self.t0))
-            - wofz(np.exp(1j * np.pi / 6) * np.sqrt(2 * t / self.t0))
-            - wofz(-1 * np.exp(-1j * np.pi / 6) * np.sqrt(2 * t / self.t0)) ) )
+        wl = np.real( factor *
+                     ( 4 * np.exp(-1 * t / self.t0) *
+                      np.cos(np.sqrt(3) * t / self.t0)
+                      + wofz( 1j *
+                             np.sqrt(2 * t / self.t0) )
+                      - wofz( np.exp(1j * np.pi / 6) *
+                              np.sqrt(2 * t / self.t0) )
+                      - wofz( -1 * np.exp(-1j * np.pi / 6) *
+                              np.sqrt(2 * t / self.t0)) ) )
         return wl
 
     def __TransWakeExact(self, t, factor):
-        wt = np.real( factor * ( 2 * np.exp(-1 * t / self.t0)
-            * ( np.sqrt(3) * np.sin(np.sqrt(3) * t / self.t0)
-            - np.cos(np.sqrt(3) * t / self.t0) )
-            + wofz(1j * np.sqrt(2 * t / self.t0))
-            + np.exp(-1j * np.pi / 3) * wofz( np.exp(1j * np.pi / 6)
-            * np.sqrt(2 * t / self.t0) )
-            + np.exp(1j * np.pi / 3) * wofz( -1 * np.exp(-1j * np.pi / 6)
-            * np.sqrt(2 * t / self.t0) ) ) )
+        wt = np.real( factor *
+                     ( 2 * np.exp(-1 * t / self.t0) *
+                      ( np.sqrt(3) *
+                        np.sin(np.sqrt(3) * t / self.t0) -
+                        np.cos(np.sqrt(3) * t / self.t0) )
+                      + wofz( 1j *
+                              np.sqrt(2 * t / self.t0) )
+                      + np.exp(-1j * np.pi / 3) *
+                        wofz( np.exp(1j * np.pi / 6) *
+                              np.sqrt(2 * t / self.t0) )
+                      + np.exp(1j * np.pi / 3) *
+                        wofz( -1 * np.exp(-1j * np.pi / 6) *
+                              np.sqrt(2 * t / self.t0) ) ) )
         return wt
 
     def __LongWakeApprox(self, t):