Use __all__ in bitcoin.core.scripteval

Previously was exporting the entire bitcoin.core.script namespace as
well.

 [ yapified by gitreformat (github/ghtdak) on Mon Nov 30 21:11:10 2015 ]

Author: petertodd

bitcoin/core/scripteval.py

@@ -30,6 +30,8 @@
 import bitcoin.core.key
 import bitcoin.core.serialize
 
+# Importing everything for simplicity; note that we use __all__ at the end so
+# we're not exporting the whole contents of the script module.
 from bitcoin.core.script import *
 
 nMaxNumSize = 4
@@ -788,3 +790,20 @@ def VerifySignature(txFrom, txTo, inIdx):
         raise VerifySignatureError("prevout hash does not match txFrom")
 
     VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, inIdx)
+
+
+__all__ = ('MAX_STACK_ITEMS',
+           'SCRIPT_VERIFY_P2SH',
+           'SCRIPT_VERIFY_STRICTENC',
+           'SCRIPT_VERIFY_EVEN_S',
+           'SCRIPT_VERIFY_NOCACHE',
+           'EvalScriptError',
+           'MaxOpCountError',
+           'MissingOpArgumentsError',
+           'ArgumentsInvalidError',
+           'VerifyOpFailedError',
+           'EvalScript',
+           'VerifyScriptError',
+           'VerifyScript',
+           'VerifySignatureError',
+           'VerifySignature',)