fix vtFunction

vn.trader/vtFunction.py

@@ -6,7 +6,6 @@
 
 import decimal
 import json
-import sys
 
 MAX_NUMBER = 10000000000000
 MAX_DECIMAL = 4
@@ -25,9 +24,6 @@ def safeUnicode(value):
         if abs(d.as_tuple().exponent) > MAX_DECIMAL:
             value = round(value, ndigits=MAX_DECIMAL)
     
-    # Reload sys, Set default encode to UTF8
-    reload(sys)
-    sys.setdefaultencoding('utf8')
     return unicode(value)
 
 #----------------------------------------------------------------------

vn.trader/vtMain.py

@@ -14,6 +14,10 @@ def main():
     if platform.uname() == 'Windows':
         ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID('vn.py demo')  
     
+    # Reload sys, Set default encode to UTF8
+    reload(sys)
+    sys.setdefaultencoding('utf8')
+
     # 初始化Qt应用对象
     app = QtGui.QApplication(sys.argv)
     app.setWindowIcon(QtGui.QIcon('vnpy.ico'))