/
io.py
698 lines (576 loc) · 20.6 KB
/
io.py
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from typing import Union
from typing import Optional
from typing import List
from typing import Sequence
from typing import IO
from typing import Any
from typing import cast
from typing import overload
from typing import Literal
import os
import io
import tempfile
import pathlib
from rdkit.Chem import PandasTools
from rdkit.Chem import rdmolfiles # type: ignore
import pandas as pd
import fsspec
import fsspec.utils
import datamol as dm
from .types import Mol
def read_csv(
urlpath: Union[str, os.PathLike, IO],
smiles_column: Optional[str] = None,
mol_column: str = "mol",
**kwargs: Any,
) -> pd.DataFrame:
"""Read a CSV file.
Args:
urlpath: Path to a file or a file-like object. Path can be remote or local.
smiles_column: Use this column to build a mol column.
mol_column: Name to give to the mol column. If not None a mol column will be build.
Avoid when loading a very large file.
**kwargs: Arguments to pass to `pd.read_csv()`.
Returns:
df: a `pandas.DataFrame`
"""
df = pd.read_csv(urlpath, **kwargs)
df = cast(pd.DataFrame, df)
if smiles_column is not None:
PandasTools.AddMoleculeColumnToFrame(df, smiles_column, mol_column)
return df
def read_excel(
urlpath: Union[str, os.PathLike, IO],
sheet_name: Optional[Union[str, int, list]] = 0,
smiles_column: Optional[str] = None,
mol_column: str = "mol",
**kwargs: Any,
) -> pd.DataFrame:
"""Read an excel file.
Args:
urlpath: Path to a file or a file-like object. Path can be remote or local.
sheet_name: see `pandas.read_excel()` doc.
mol_column: Name to give to the mol column. If not None a mol column will be build.
Avoid when loading a very large file.
mol_column: name to give to the mol column.
**kwargs: Arguments to pass to `pd.read_excel()`.
Returns:
df: a `pandas.DataFrame`
"""
df = pd.read_excel(urlpath, sheet_name=sheet_name, **kwargs)
df = cast(pd.DataFrame, df)
if smiles_column is not None:
PandasTools.AddMoleculeColumnToFrame(df, smiles_column, mol_column)
return df
def _get_supplier_mols(
supplier: rdmolfiles.ForwardSDMolSupplier,
max_num_mols: Optional[int],
) -> List[dm.Mol]:
"""Given a supplier, read the molecules until we reach the `max_num_mols` limit.
Useful when reading SDF files.
"""
if max_num_mols is None:
mols = list(supplier)
else:
mols = []
for _ in range(max_num_mols):
try:
mols.append(next(supplier))
except StopIteration:
break
return mols
@overload
def read_sdf(
urlpath: Union[str, os.PathLike, IO],
sanitize: bool = ...,
as_df: Literal[False] = ...,
smiles_column: Optional[str] = ...,
mol_column: Optional[str] = ...,
include_private: bool = ...,
include_computed: bool = ...,
strict_parsing: bool = ...,
remove_hs: bool = ...,
max_num_mols: Optional[int] = ...,
discard_invalid: bool = ...,
n_jobs: Optional[int] = ...,
) -> List[Mol]: ...
@overload
def read_sdf(
urlpath: Union[str, os.PathLike, IO],
sanitize: bool = ...,
as_df: Literal[True] = ...,
smiles_column: Optional[str] = ...,
mol_column: Optional[str] = ...,
include_private: bool = ...,
include_computed: bool = ...,
strict_parsing: bool = ...,
remove_hs: bool = ...,
max_num_mols: Optional[int] = ...,
discard_invalid: bool = ...,
n_jobs: Optional[int] = ...,
) -> pd.DataFrame: ...
@overload
def read_sdf(
urlpath: Union[str, os.PathLike, IO],
sanitize: bool = ...,
as_df: bool = ...,
smiles_column: Optional[str] = ...,
mol_column: Optional[str] = ...,
include_private: bool = ...,
include_computed: bool = ...,
strict_parsing: bool = ...,
remove_hs: bool = ...,
max_num_mols: Optional[int] = ...,
discard_invalid: bool = ...,
n_jobs: Optional[int] = ...,
) -> Union[List[Mol], pd.DataFrame]: ...
def read_sdf(
urlpath: Union[str, os.PathLike, IO],
sanitize: bool = True,
as_df: bool = False,
smiles_column: Optional[str] = "smiles",
mol_column: Optional[str] = None,
include_private: bool = False,
include_computed: bool = False,
strict_parsing: bool = True,
remove_hs: bool = True,
max_num_mols: Optional[int] = None,
discard_invalid: bool = True,
n_jobs: Optional[int] = 1,
) -> Union[List[Mol], pd.DataFrame]:
"""Read an SDF file.
Note: This function is meant to be used with dataset that fit _in-memory_.
For a more advanced usage we suggest you to use directly `Chem.ForwardSDMolSupplier`.
Args:
urlpath: Path to a file or a file-like object. Path can be remote or local.
sanitize: Whether to sanitize the molecules.
as_df: Whether to return a list mol or a pandas DataFrame.
smiles_column: Name of the SMILES column. Only relevant if `as_df` is True.
mol_column: Name of the mol column. Only relevant if `as_df` is True.
include_private: Include private properties in the columns. Only relevant if
`as_df` is True.
include_computed: Include computed properties in the columns. Only relevant if
`as_df` is True.
strict_parsing: If set to false, the parser is more lax about correctness of the contents.
remove_hs: Whether to remove the existing hydrogens in the SDF files.
max_num_mols: Maximum number of molecules to read from the SDF file. Read all by default when set
to `None`.
discard_invalid: Discard the molecules that failed to be read correctly. Otherwise,
invalid molecules will be loaded as `None`.
n_jobs: Optional number of jobs for parallelization of `to_df`. Leave to 1 for no
parallelization. Set to -1 to use all available cores. Only relevant is `as_df` is True
"""
# File-like object
if isinstance(urlpath, io.IOBase):
supplier = rdmolfiles.ForwardSDMolSupplier(
urlpath,
sanitize=sanitize,
strictParsing=strict_parsing,
removeHs=remove_hs,
)
mols = _get_supplier_mols(supplier, max_num_mols)
# Regular local or remote paths
else:
with fsspec.open(urlpath, compression="infer") as f:
supplier = rdmolfiles.ForwardSDMolSupplier(
f,
sanitize=sanitize,
strictParsing=strict_parsing,
removeHs=remove_hs,
)
mols = _get_supplier_mols(supplier, max_num_mols)
# Discard None values
if discard_invalid:
mols = [mol for mol in mols if mol is not None]
# Convert to dataframe
if as_df:
return dm.to_df(
mols,
smiles_column=smiles_column,
mol_column=mol_column,
include_private=include_private,
include_computed=include_computed,
n_jobs=n_jobs,
) # type: ignore
return mols
def to_sdf(
mols: Union[Mol, Sequence[Mol], pd.DataFrame],
urlpath: Union[str, os.PathLike, IO],
smiles_column: Optional[str] = "smiles",
mol_column: Optional[str] = None,
):
"""Write molecules to a file.
Args:
mols: a dataframe, a molecule or a list of molecule.
urlpath: Path to a file or a file-like object. Path can be remote or local.
smiles_column: Column name to extract the molecule.
mol_column: Column name to extract the molecule. It takes
precedence over `smiles_column`.
"""
if isinstance(mols, pd.DataFrame):
mols = dm.from_df(mols, smiles_column=smiles_column, mol_column=mol_column)
elif isinstance(mols, Mol):
mols = [mols]
# Filter out None values
mols = [mol for mol in mols if mol is not None]
# File-like object
if isinstance(urlpath, io.IOBase):
writer = rdmolfiles.SDWriter(urlpath)
for mol in mols:
writer.write(mol)
writer.close()
# Regular local or remote paths
else:
with fsspec.open(urlpath, mode="w") as f:
writer = rdmolfiles.SDWriter(f)
for mol in mols:
writer.write(mol)
writer.close()
def read_mol2file(
urlpath: Union[str, os.PathLike, IO],
sanitize: bool = True,
cleanup_substructures: bool = True,
remove_hs: bool = True,
fail_if_invalid: bool = False,
) -> List[Mol]:
"""Read a Mol2 File
Args:
urlpath: Path to a file or a file-like object. Path can be remote or local.
sanitize: Whether to sanitize the molecules.
remove_hs: Whether to remove the existing hydrogens in the SDF files.
cleanup_substructures: Whether to clean up substructure in the Mol2 Files.
fail_if_invalid: If set to true, the parser will raise an exception if the molecule is invalid
instead of returning None.
"""
block = []
mols = []
with fsspec.open(urlpath, compression="infer") as f:
f = cast(IO, f)
fReadLines = f.readlines()
# reversing due to ambiguous end line for mol2 files
fReadLines.reverse()
for line in fReadLines:
# ignores any header info
if b"#" not in line:
block.append(str(line, "utf-8"))
# since reversed, this is the 'end' a mol2
if b"@<TRIPOS>MOLECULE" in line:
block.reverse()
mol2block = ",".join(block).replace(",", "")
mol = rdmolfiles.MolFromMol2Block(
mol2block,
sanitize=sanitize,
removeHs=remove_hs,
cleanupSubstructures=cleanup_substructures,
)
if mol is None and fail_if_invalid:
raise ValueError(f"Invalid molecule: {mol2block}")
mols.append(mol)
block = []
mols.reverse()
return mols
def read_molblock(
molblock: str,
sanitize: bool = True,
strict_parsing: bool = True,
remove_hs: bool = True,
fail_if_invalid: bool = False,
) -> Optional[dm.Mol]:
"""Read a Mol block.
Note that potential molecule properties are **not** read.
Args:
molblock: String containing the Mol block.
sanitize: Whether to sanitize the molecules.
strict_parsing: If set to false, the parser is more lax about correctness of the contents.
remove_hs: Whether to remove the existing hydrogens in the SDF files.
fail_if_invalid: If set to true, the parser will raise an exception if the molecule is invalid
instead of returning None.
"""
mol = rdmolfiles.MolFromMolBlock(
molblock,
sanitize=sanitize,
removeHs=remove_hs,
strictParsing=strict_parsing,
)
if mol is None and fail_if_invalid:
raise ValueError(f"Invalid molecule: {molblock}")
return mol
def to_molblock(
mol: Mol,
include_stereo: bool = True,
conf_id: int = -1,
kekulize: bool = True,
force_V3000: bool = False,
):
"""Convert a molecule to a mol block string.
Note that any molecule properties are lost.
Args:
mol: A molecule.
include_stereo: Toggles inclusion of stereochemical information in the output.
conf_id: Selects which conformation to output.
kekulize: Triggers kekulization of the molecule before it's written,
as suggested by the MDL spec.
force_V3000: Force generation a V3000 mol block (happens automatically
with more than 999 atoms or bonds).
"""
molblock = rdmolfiles.MolToMolBlock(
mol,
includeStereo=include_stereo,
confId=conf_id,
kekulize=kekulize,
forceV3000=force_V3000,
)
return molblock
def read_pdbblock(
molblock: str,
sanitize: bool = True,
remove_hs: bool = True,
flavor: int = 0,
proximity_bonding: bool = True,
) -> dm.Mol:
"""Read a PDB string block.
Args:
molblock: String containing the Mol block.
sanitize: Whether to sanitize the molecules.
remove_hs: Whether to remove the existing hydrogens in the SDF files.
flavor: RDKit flavor options.
proximity_bonding: Whether to toggles automatic proximity bonding.
"""
mol = rdmolfiles.MolFromPDBBlock(
molblock,
sanitize=sanitize,
removeHs=remove_hs,
flavor=flavor,
proximityBonding=proximity_bonding,
)
return mol
def to_pdbblock(mol: Mol, conf_id: int = -1) -> str:
"""Convert a molecule to a PDB string block.
Args:
mol: A molecule.
conf_id: Selects which conformation to use.
"""
molblock = rdmolfiles.MolToPDBBlock(mol, confId=conf_id)
return molblock
def read_pdbfile(
urlpath: Union[str, os.PathLike],
sanitize: bool = True,
remove_hs: bool = True,
flavor: int = 0,
proximity_bonding: bool = True,
) -> Mol:
"""Read a PDB file.
Args:
urlpath: Path to a file or a file-like object. Path can be remote or local.
sanitize: Whether to sanitize the molecules.
remove_hs: Whether to remove the existing hydrogens in the SDF files.
flavor: RDKit flavor options.
proximity_bonding: Whether to toggles automatic proximity bonding.
Returns:
mol: a molecule
"""
with fsspec.open(urlpath, "r") as f:
f = cast(IO, f)
mol = read_pdbblock(
f.read(),
sanitize=sanitize,
remove_hs=remove_hs,
flavor=flavor,
proximity_bonding=proximity_bonding,
)
return mol
def to_pdbfile(
mol: Mol,
urlpath: Union[str, os.PathLike],
conf_id: int = -1,
):
"""Save a molecule to a PDB file.
Args:
mol: A molecule.
urlpath: Path to a file or a file-like object. Path can be remote or local.
conf_id: Selects which conformation to use.
"""
molblock = to_pdbblock(mol, conf_id=conf_id)
with fsspec.open(urlpath, "w") as f:
f = cast(IO, f)
f.write(molblock)
def to_smi(
mols: Sequence[Mol],
urlpath: Union[str, os.PathLike, IO],
error_if_empty: bool = False,
):
"""Save a list of molecules in an `.smi` file.
Note: We **strongly** recommend you to use `dm.to_csv` instead
of `dm.to_smi` since `.smi` files are CSV-like format. The only difference are the
default settings which changes:
- The default separator is a space ` ` instead of a comma `,`.
- The headers of the column are not included.
By modifying the args of `dm.to_csv()`, you will be able to save a SMI compatible file.
Args:
mols: a list of molecules.
urlpath: Path to a file or a file-like object. Path can be remote or local.
error_if_empty: whether to raise and error if the input list is empty.
"""
if len(mols) == 0 and error_if_empty:
raise ValueError("The list of mols/smiles provided is empty.")
# Filter out None values
mols = [mol for mol in mols if mol is not None]
# File-like object
if isinstance(urlpath, io.IOBase):
writer = rdmolfiles.SmilesWriter(urlpath, includeHeader=False, nameHeader="")
for mol in mols:
writer.write(mol)
writer.close()
# Regular local or remote paths
else:
with fsspec.open(urlpath, "w") as f:
writer = rdmolfiles.SmilesWriter(f, includeHeader=False, nameHeader="")
for mol in mols:
writer.write(mol)
writer.close()
def read_smi(
urlpath: Union[str, pathlib.Path, io.IOBase, fsspec.core.OpenFile],
) -> Sequence[Mol]:
"""Read a list of smiles from am `.smi` file.
Note: We **strongly** recommend you to use `dm.read_csv` or `pandas.read_csv` instead
of `dm.read_smi` since `.smi` files are CSV-like format. The only difference are the
default settings which changes:
- The default separator is a space ` ` instead of a comma `,`.
- The headers of the column are not included.
By modifying the args of `dm.read_csv()`, you will be able to read an `.smi` files.
Args:
urlpath: Path to a file or a file-like object. Path can be remote or local.
"""
active_path = urlpath
# NOTE(hadim): the temporary local file copy
# is because `SmilesMolSupplier` does not support
# using file-like object, only path.
# Copy to a local temporary path if the path is a remote one.
if not fsspec.utils.can_be_local(str(urlpath)):
active_path = pathlib.Path(tempfile.mkstemp()[1])
dm.utils.fs.copy_file(urlpath, active_path, force=True)
# Read the molecules
supplier = rdmolfiles.SmilesMolSupplier(str(active_path), titleLine=0)
mols = [mol for mol in supplier if mol is not None]
# Delete the local temporary path
if not fsspec.utils.can_be_local(str(urlpath)):
pathlib.Path(str(active_path)).unlink()
return mols
def to_xlsx(
mols: Union[Mol, Sequence[Mol], pd.DataFrame],
urlpath: Union[str, os.PathLike],
smiles_column: Optional[str] = "smiles",
mol_column: str = "mol",
mol_size: List[int] = [300, 300],
):
"""Write molecules to an Excel file with a molecule column as an RDKit rendered
image.
Args:
mols: a dataframe, a molecule or a list of molecule.
urlpath: Path to a file or a file-like object. Path can be remote or local.
smiles_column: Column name to extract the molecule.
mol_column: Column name to extract the molecule. It takes
precedence over `smiles_column`.
Column name to write the RDKit rendered image. If none,
the molecule images are not written.
"""
if isinstance(mols, Mol):
mols = [mols]
if isinstance(mols, Sequence):
mols = [mol for mol in mols if mol is not None]
mols = dm.to_df(mols, smiles_column=smiles_column, mol_column=mol_column)
if mols is None or mols.empty: # type: ignore
raise ValueError("No molecules to write")
with fsspec.open(urlpath, mode="wb") as f:
PandasTools.SaveXlsxFromFrame(mols, f, molCol=mol_column, size=mol_size)
EXTENSIONS_DICT = {
"csv": [
".csv",
".csv.gz",
".csv.bz2",
".csv.zip",
".csv.xz",
".csv.zst",
".csv.tar",
".csv.tar.gz",
".csv.tar.xz",
".csv.tar.bz2",
],
"excel": [".xlsx"],
"parquet": [".parquet"],
"json": [
".json",
".json.gz",
".json.bz2",
".json.zip",
".json.xz",
".json.zst",
".json.tar",
".json.tar.gz",
".json.tar.xz",
".json.tar.bz2",
],
"sdf": [
".sdf",
".sdf.gz",
],
}
def _guess_filetype(path: str):
"""Return a filetype given an input path. Filetypes returned can be from
`csv, excel, parquet, json, sdf`.
"""
for name, extensions in EXTENSIONS_DICT.items():
for ext in extensions:
if path.endswith(ext):
return name
def open_df(path: str, **kwargs: Any) -> pd.DataFrame:
"""Open a dataframe file whatever its filetype from
`csv, excel, parquet, json, sdf`.
Args:
path: path to the file.
**kwargs: keyword arguments to pass to the underlying reader.
"""
filetype = _guess_filetype(path)
data = None
if filetype == "csv":
data = pd.read_csv(path, **kwargs)
elif filetype == "excel":
data = pd.read_excel(path, **kwargs)
elif filetype == "parquet":
data = pd.read_parquet(path, **kwargs)
elif filetype == "json":
data = pd.read_json(path, **kwargs)
elif filetype == "sdf":
kwargs.setdefault("as_df", True)
data = dm.read_sdf(path, **kwargs)
else:
raise ValueError(f"The file type of {path} is not supported.")
data = cast(pd.DataFrame, data)
return data
def save_df(
data: pd.DataFrame,
path: str,
**kwargs: Any,
):
"""Save a dataframe file whatever its filetype from
`csv, excel, parquet, json, sdf`.
Args:
data: dataframe to save.
path: path to save the file.
**kwargs: additional arguments to pass that are specific to the file save type.
"""
filetype = _guess_filetype(path)
if filetype == "csv":
kwargs.setdefault("index", False)
data.to_csv(path, **kwargs)
elif filetype == "excel":
kwargs.setdefault("index", False)
data.to_excel(path, **kwargs)
elif filetype == "parquet":
data.to_parquet(path, **kwargs)
elif filetype == "json":
data.to_json(path, **kwargs)
elif filetype == "sdf":
dm.to_sdf(data, path, **kwargs)
else:
raise ValueError(f"The file type of {path} is not supported.")