write yaml output and simplifies to better reading

check

@@ -10,7 +10,7 @@ from trytond.transaction import Transaction
 from trytond.pool import Pool
 import logging
 from lxml import etree
-import pprint
+import yaml
 
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.DEBUG)
@@ -28,6 +28,20 @@ pool.init()
 
 context = {'company': 1}
 
+try:
+    # Using LibYaml-based parser if available because it is much faster.
+    from yaml import CSafeDumper as SafeDumper
+except ImportError:
+    from yaml import SafeDumper
+
+def to_yaml(obj, output_file, padding=None, separator=None):
+    res = yaml.dump(obj, output_file,  Dumper=SafeDumper, default_flow_style=False)
+    if padding:
+        res = '\n'.join([padding + x for x in
+                res.splitlines()])
+    if separator:
+        res = separator.join(res.splitlines())
+    return res
 
 def download_fields_view_get():
     '''
@@ -37,7 +51,6 @@ def download_fields_view_get():
     version = '4.8'
     filename = "%s_%s"%(dbname, version)
     log_file = open(filename, 'w')
-    pp = pprint.PrettyPrinter(depth=2, stream=log_file)
     with Transaction().start(dbname, 1):
         View = pool.get('ir.ui.view')
         views = View.search([
@@ -64,7 +77,9 @@ def download_fields_view_get():
 
             r = res.copy()
             del r['arch']
-            pp.pprint(r)
+            r['fields'] = r['fields'].keys()
+
+            to_yaml(r, log_file)
 
 
 def check_data():