THRIFT-557 charset problem with file Autogenerated by Thrift
Client: Python
Patch: zhenghuabin <zhenghuabin@bytedance.com>

This closes #601
diff --git a/compiler/cpp/src/generate/t_py_generator.cc b/compiler/cpp/src/generate/t_py_generator.cc
index 2002c1e..10b1680 100644
--- a/compiler/cpp/src/generate/t_py_generator.cc
+++ b/compiler/cpp/src/generate/t_py_generator.cc
@@ -99,6 +99,11 @@
     iter = parsed_options.find("utf8strings");
     gen_utf8strings_ = (iter != parsed_options.end());
 
+    iter = parsed_options.find("coding");
+    if (iter != parsed_options.end()) {
+        coding_ = iter->second;
+    }
+
     copy_options_ = option_string;
 
     if (gen_twisted_) {
@@ -276,6 +281,12 @@
   bool gen_utf8strings_;
 
   /**
+   * specify generated file encoding
+   * eg. # -*- coding: utf-8 -*-
+   */
+  string coding_;
+
+  /**
    * File streams
    */
 
@@ -382,7 +393,11 @@
  * Autogen'd comment
  */
 string t_py_generator::py_autogen_comment() {
-  return std::string("#\n") + "# Autogenerated by Thrift Compiler (" + THRIFT_VERSION + ")\n"
+  string coding;
+  if (!coding_.empty()) {
+      coding = "# -*- coding: " + coding_ + " -*-\n";
+  }
+  return coding + std::string("#\n") + "# Autogenerated by Thrift Compiler (" + THRIFT_VERSION + ")\n"
          + "#\n" + "# DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING\n" + "#\n"
          + "#  options string: " + copy_options_ + "\n" + "#\n";
 }
@@ -2429,6 +2444,7 @@
     "    twisted:         Generate Twisted-friendly RPC services.\n"
     "    tornado:         Generate code for use with Tornado.\n"
     "    utf8strings:     Encode/decode strings using utf8 in the generated code.\n"
+    "    coding=CODING:   Add file encoding declare in generated file.\n"
     "    slots:           Generate code using slots for instance members.\n"
     "    dynamic:         Generate dynamic code, less code generated but slower.\n"
     "    dynbase=CLS      Derive generated classes from class CLS instead of TBase.\n"