use .warning

nbformat/current.py

@@ -12,7 +12,7 @@
 import re
 import warnings
 
-warnings.warn("""nbformat.current is deprecated.
+warnings.warning("""nbformat.current is deprecated.
 
 - use nbformat for read/write/validate public API
 - use nbformat.vX directly to composing notebooks of a particular version
@@ -50,15 +50,15 @@ class NBFormatError(ValueError):
 
 
 def _warn_format():
-    warnings.warn("""Non-JSON file support in nbformat is deprecated.
+    warnings.warning("""Non-JSON file support in nbformat is deprecated.
     Use nbconvert to create files of other formats.""")
 
 
 def parse_py(s, **kwargs):
     """Parse a string into a (nbformat, string) tuple."""
     nbf = current_nbformat
     nbm = current_nbformat_minor
-    
+
     pattern = r'# <nbformat>(?P<nbformat>\d+[\.\d+]*)</nbformat>'
     m = re.search(pattern,s)
     if m is not None:
@@ -72,12 +72,12 @@ def parse_py(s, **kwargs):
 
 def reads_json(nbjson, **kwargs):
     """DEPRECATED, use reads"""
-    warnings.warn("reads_json is deprecated, use reads")
+    warnings.warning("reads_json is deprecated, use reads")
     return reads(nbjson)
 
 def writes_json(nb, **kwargs):
     """DEPRECATED, use writes"""
-    warnings.warn("writes_json is deprecated, use writes")
+    warnings.warning("writes_json is deprecated, use writes")
     return writes(nb, **kwargs)
 
 def reads_py(s, **kwargs):
@@ -189,4 +189,3 @@ def write(nb, fp, format='DEPRECATED', **kwargs):
     if isinstance(s, bytes):
         s = s.decode('utf8')
     return fp.write(s)
-

nbformat/v3/nbbase.py

@@ -54,7 +54,7 @@ def cast_str(obj):
     if isinstance(obj, bytes):
         # really this should never happend, it should
         # have been base64 encoded before.
-        warnings.warn(
+        warnings.warning(
             "A notebook got bytes instead of likely base64 encoded values."
             "The content will likely be corrupted.",
             UserWarning,
@@ -225,4 +225,3 @@ def new_author(name=None, email=None, affiliation=None, url=None):
     if url is not None:
         author.url = str_passthrough(url)
     return author
-