Metadata
class#
Bases: OrderedDict
Interface to metadata
Note that the constructor is not generally useful from outside this class. See Metadata.from_file, etc., for more useful initialization functions.
This object is essentially a collections.OrderedDict
, with a few extra features:
1) Keys are always forced to be valid python identifiers, whether setting or
getting.
2) There are a few extra methods for constructing these objects from json data or
files or txt files, and outputting them to json or txt files.
3) If an attribute does not exist on the object, the keys are searched. This
allows for tab-completion on the key names.
4) Properties (methods without parentheses) that attempt to automatically
determine the resolution and lev number from the 'simulation-name'.
Source code in sxs/metadata/metadata.py
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|
lev
property
#
Try to determine an integer "Lev" number from the "simulation-name" field
resolution
property
#
Try to determine the resolution from the "simulation-name" field
simulation_group
property
#
Remove any trailing "/LevN" part of the simulation-name
__dir__()
#
__getattribute__(name)
#
Include keys as attributes
This allows retrieval of a key like md["simulation_name"]
as md.simulation_name
.
Source code in sxs/metadata/metadata.py
__init__(*args, **kwargs)
#
Initialize the OrderedDict, converting all keys to valid identifiers
Note that the constructor is not generally useful from outside this class. See Metadata.from_file, etc., for more useful initialization functions.
This function intercepts the allowed args and kwargs and converts any keys before simply calling the base class's initialization function.
Source code in sxs/metadata/metadata.py
add_com_parameters(first_only=True, raise_on_errors=False)
#
Add any translation and boost parameters found in all CoM files in this directory
Adds a new key com_parameters
to the top level of the metadata dictionary
containing the space_translation
and boost_velocity
parameters for the COM
correction.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
first_only |
bool
|
If True, add the first set of parameters directly under the top-level key
|
True
|
raise_on_errors |
bool
|
If False, suppress any exceptions that happen in the core loop of this function; otherwise, raise. |
False
|
Source code in sxs/metadata/metadata.py
add_extras(raise_on_errors=False)
#
Add information to the metadata from other files in its directory
Source code in sxs/metadata/metadata.py
add_standard_parameters(raise_on_errors=False)
#
Add standard parameters that aren't included in the default metadata fields
New parameters include 'object_types', 'initial_mass_ratio', and 'reference_mass_ratio'. If 'reference_dimensionless_spin*' are not present, but the parameters necessary to compute them are, they are also added. Finally, we also add 'reference_chi_eff', 'reference_chi1_perp', and 'reference_chi2_perp'.
Source code in sxs/metadata/metadata.py
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|
from_file(file_name, ignore_invalid_lines=False, cache_json=True)
classmethod
#
Read a file into a Metadata object
Parameters:
Name | Type | Description | Default |
---|---|---|---|
file_name |
str
|
The input |
required |
ignore_invalid_lines |
bool
|
If True, invalid lines will be ignored; otherwise, an error will be raised. |
False
|
cache_json |
bool
|
If True, and the |
True
|
Raises:
Type | Description |
---|---|
SyntaxError : on `.txt` parse errors when `ignore_invalid_lines` is False.
|
|
Source code in sxs/metadata/metadata.py
from_json_data(json_data)
classmethod
#
Read metadata from a file-like object (not a file)
Parameters:
Name | Type | Description | Default |
---|---|---|---|
json_data |
file-like object
|
Note that this cannot be just a file name; it must be a file-like object
(such as an open file handle). See the |
required |
See Also
sxs.Metadata.from_json_file : .json
files
sxs.Metadata.from_file : reads .txt
or .json
files
Source code in sxs/metadata/metadata.py
from_json_file(json_file)
classmethod
#
Read metadata.json file
Parameters:
Name | Type | Description | Default |
---|---|---|---|
json_file |
str
|
The path to an |
required |
See Also
sxs.Metadata.from_file : reads .txt
or .json
files
Source code in sxs/metadata/metadata.py
from_txt_file(txt_file, ignore_invalid_lines=False, cache_json=True)
classmethod
#
Read metadata.txt file
Parameters:
Name | Type | Description | Default |
---|---|---|---|
txt_file |
str
|
The path to an old-style |
required |
ignore_invalid_lines |
bool
|
If True, invalid lines will be ignored; otherwise, an error will be raised. |
False
|
cache_json |
bool
|
If True, a new |
True
|
See Also
sxs.Metadata.from_file : reads .txt
or .json
files
Notes
A standard metadata.txt file is close to being an executable python script that just defines a bunch of constants. The three main problems with the metadata.txt format are
1) variable names contain dashes, which is the subtraction operator in python, 2) strings are not enclosed in quotes, and 3) lists are not enclosed in brackets
It is easy to correct these problems. In particular, (1) is resolved by
changing dashes to underscores in the identifiers. A bug in SpEC
metadata.txt files -- whereby some comment lines are missing the initial #
--
is also fixed. There are also occasional other problems, like commas missing
from lists. All syntax errors as of this writing are fixed in this function.
Note that this function is not very flexible when it comes to generalizing the syntax of the metadata.txt files. In particular, it assumes that the right-hand sides are either numbers or strings (or lists of either numbers or strings). For example, I think I've seen cases where the eccentricity is given as something like "<1e-5". Since python has no "less-than" type, this is converted to a string. But generally, this does seem to work on metadata.txt files in the SXS waveform repository.
Source code in sxs/metadata/metadata.py
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reorder_keys(order=None)
#
Return a copy of this object with keys reordered
It is sometimes nice to reorder the keys of the metadata to display the most interesting quantities first. The usual order output by SpEC, for example, hides crucial quantities like the masses and spins after lots of uninteresting keys like the author list and various bibtex groups. This function allows the keys to be reordered using exact matches and regular expressions.
Source code in sxs/metadata/metadata.py
to_json(indent=4, separators=(',', ': '))
#
to_json_file(json_file, indent=4, separators=(',', ': '))
#
Write to JSON file
Source code in sxs/metadata/metadata.py
to_txt()
#
Export to string like metadata.txt contents
Source code in sxs/metadata/metadata.py
to_txt_file(txt_file)
#
Write to file in metadata.txt format