fix for pylint

Author: jepler

jepler_udecimal/utrig.py

@@ -198,11 +198,10 @@ def asin(x, context=None):
 
     with localcontext(context) as ctx:
         ctx.prec += 2
-        pi = Decimal(1).atan() * 4
         if x == 1:
-            r = pi / 2  # pi * 1/2 radians
+            r = atan(Decimal(1)) * 2  # pi * 1/2 radians
         elif x == -1:
-            r = pi / -2  # pi * -1/2 radians
+            r = atan(Decimal(1)) * -2  # pi * -1/2 radians
         else:
             r = atan(x / (1 - x * x).sqrt())
     return r / 1
@@ -227,7 +226,7 @@ def acos(x, context=None):
         if x == 1:
             r = Decimal(0)  # 0 radians
         elif x == -1:
-            r = Decimal(1).atan() * 4  # pi radians
+            r = atan(Decimal(1)) * 4  # pi radians
         else:
             r = atan((1 - x * x).sqrt() / x)
         if r < 0: