#### NOTE
[Go to the end](#sphx-glr-download-auto-examples-readers-writers-plot-data-file-reader-py)
to download the full example code.
# Data File Reader
The `DataFileParser` handles LAMMPS data files containing complete system definitions.
The [`UniverseSequence`](../../api/pylimer_tools_cpp.UniverseSequence.html.md#pylimer_tools_cpp.UniverseSequence) provides a convenient way to have these data files read
into the [`Universe`](../../api/pylimer_tools_cpp.Universe.html.md#pylimer_tools_cpp.Universe) objects.
```Python
import os
from pathlib import Path
from pylimer_tools_cpp import UniverseSequence
def _find_fixtures_dir() -> Path:
for cur in (
[Path(__file__).resolve().parent] if "__file__" in globals() else []
) + [Path.cwd()]:
for p in [cur] + list(cur.parents):
candidate = p / "tests" / "pylimer_tools" / "fixtures"
if candidate.is_dir():
return candidate
return Path("tests/pylimer_tools/fixtures").resolve()
_fixtures_dir = _find_fixtures_dir()
base_structure_path = str(_fixtures_dir / "structure")
# Load a single data file
data_file = os.path.join(
base_structure_path,
"melt_83_a_100.structure.out",
)
one_universe_seq = UniverseSequence()
one_universe_seq.initialize_from_data_sequence([data_file])
universe = one_universe_seq.at_index(0)
# Load multiple data files as a sequence
sequence = UniverseSequence()
sequence.initialize_from_data_sequence(
[
os.path.join(
base_structure_path,
"3d-diamond-lattice_10x10x10_a_3_d_0.85_imperfect.structure.out",
),
os.path.join(
base_structure_path,
"3d-diamond-lattice_10x10x10_a_3_d_0.85_v_0.V-fixed.structure.out",
),
]
)
for universe in sequence:
print(f"Loaded universe with {universe.get_nr_of_atoms()} atoms")
```
```none
Loaded universe with 56000 atoms
Loaded universe with 56000 atoms
```
Please note that the `hybrid` and `tdpd` atom styles are not fully supported.
If your data files don’t hint the atom style in the line that starts with “Atom”,
you should specify it manually, see [`read()`](../../api/pylimer_tools_cpp.DataFileReader.html.md#pylimer_tools_cpp.DataFileReader.read)
and [`set_data_file_atom_style()`](../../api/pylimer_tools_cpp.UniverseSequence.html.md#pylimer_tools_cpp.UniverseSequence.set_data_file_atom_style).
**Total running time of the script:** (0 minutes 0.130 seconds)
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[`Download Python source code: plot_data_file_reader.py`](_downloads/74dcca5ad9c0401b9b61a9e8c9109c8c/plot_data_file_reader.py)
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