Revert accidental extra changes included in r82391.

Demo/parser/unparse.py

@@ -1,4 +1,3 @@
-#! /usr/bin/env python3.1
 "Usage: unparse.py <path to source file>"
 import sys
 import math
@@ -312,35 +311,11 @@ class Unparser:
         self.write(t.id)
 
     def _Num(self, t):
-        # Python doesn't have negative numeric literals, but in Python
-        # 2.x and early versions of Python 3.1, there's a compile-time
-        # operation that turns "-<number>" into a single _Num, instead
-        # of an unary minus applied to a _Num.  Here we reverse that.
-        infstr = "1e" + repr(sys.float_info.max_10_exp + 1)
-
-        if isinstance(t.n, complex):
-            # check that real part is as expected:  0 with appropriate sign
-            print(t.n)
-            print(str(t.n.real), str(math.copysign(0.0, t.n.imag)))
-            assert str(t.n.real) == str(math.copysign(0.0, t.n.imag))
-            negate = math.copysign(1.0, t.n.imag) < 0
-        elif isinstance(t.n, float):
-            negate = math.copysign(1.0, t.n) < 0
-        elif isinstance(t.n, int):
-            negate = t.n < 0
-
-        if negate:
-            self.write("(- ")
-            val = -t.n
+        if isinstance(t.n, float) and math.isinf(t.n):
+            # Subsitute overflowing decimal literal for AST infinity
+            self.write("1e" + repr(sys.float_info.max_10_exp + 1))
         else:
-            val = t.n
-
-        # Subsitute an overflowing decimal literal for an AST infinity
-        self.write(repr(t.n).replace("inf", infstr))
-
-        if negate:
-            self.write(")")
-
+            self.write(repr(t.n))
 
     def _List(self, t):
         self.write("[")