Custom Query (121 matches)

Reported by pschmitt@…, 4 years ago.

I dont understand how PyYAML reads YML files with "Block Mapping", (I call these "Nested variables" in my example):

>>> document = """
 Variable 1:
   x: a
   y: b
   z: c
 Variable 2:
   1: a
   2: b
   3: c
 """
>>> yml=yaml.load(document)
>>> yml.keys()
['Variable 2', 'Variable 1']

>>> yml["Variable 1"].keys()
 ['y', 'x', 'z']

So it looks like PyYAML loads the document in reverse order, "Variable 2" is read before "Variable 1". That's fine. But why is ymlVariable 1?.keys() in a random order? It seems like it should either be chronological (x,y,z) or reverse chronological (z,y,x).

I'm having a hard time parsing tickets #29 and #116, which might be related... Can you offer up some insight?

PS: Sorry if this is the wrong place for a question... I couldn't find a mailing list.

Reported by michael.the.drummer@…, 5 years ago.

Current trunk (revision 298) of libyaml does not compile no either my Ubuntu box or on OSX Tiger. There are 2 separate issues.

The first is a simple error in yaml_private.h. A Diff of this file is below.

Index: src/yaml_private.h
===================================================================
--- src/yaml_private.h	(revision 298)
+++ src/yaml_private.h	(working copy)
@@ -1231,7 +1231,7 @@
  * The information of a node being emitted.
  */
 
-struct typedef yaml_node_data_s {
+typedef struct yaml_node_data_s {
     /* The node id. */
     int id;
     /* The collection iterator. */

The second problem I am not sure about. Build log is attached.

Michael

Reported by dfnord@…, 6 years ago.

Even though yaml specification allows lists ("flow collections on yaml jargon") to be keys, pyaml fails to use them, as lists are unhashable.

For instance, loading "[1, 2]: something" gives the error "found unacceptable key (list objects are unhashable)"

As a away around this, flow collections could be translated into a simple hasheable subclass of list, such as:

class HasheableList(list):
    #############################
    ## Public Methods
    #############################
    def __hash__(self):
        return hash(tuple(self))