create utility function instead

constructor/utils.py

@@ -9,6 +9,7 @@
 import math
 import re
 import sys
+from io import StringIO
 from os import sep, unlink
 from os.path import basename, isdir, isfile, islink, normpath
 from shutil import rmtree
@@ -17,7 +18,7 @@
 from ruamel.yaml import YAML
 
 logger = logging.getLogger(__name__)
-yaml = YAML(typ=["rt", "string"])
+yaml = YAML(typ="rt")
 yaml.default_flow_style = False
 yaml.indent(mapping=2, sequence=4, offset=2)
 
@@ -38,6 +39,12 @@ def filename_dist(dist):
         return dist
 
 
+def yaml_to_string(data):
+    blob = StringIO()
+    yaml.dump(data, blob)
+    return blob.getvalue()
+
+
 def fill_template(data, d, exceptions=[]):
     pat = re.compile(r'__(\w+)__')
 
@@ -120,7 +127,7 @@ def add_condarc(info):
         if channel_alias:
             condarc['channel_alias'] = channel_alias
     if isinstance(condarc, dict):
-        condarc = yaml.dump_to_string(condarc)
+        condarc = yaml_to_string(condarc)
     yield '# ----- add condarc'
     if info['_platform'].startswith('win'):
         yield 'Var /Global CONDARC'