pygamess

pygamess is a GAMESS wrapper for Python

Requirements

• Python 3.7 or later (pygamess <0.5 supports only Python2)
• RDKit >= 2020.03.5
• GAMESS > Jun2020R1
• ruamel.YAML

Setup

$ pip install pygamess

set GAMESS_HOME environment in your .bashrc or .zshrc:

$ export GAMESS_HOME=/usr/local/gamess

*** Mac users can obtain the pre-compiled binary executables from GAMESS download site. But Linux users will need to compile the souce code. ***

Test

$ pytest

Basic Usage

Single point calculation

>>> from pygamess import Gamess
>>> from pygamess.utils import rdkit_optimize
>>> m = rdkit_optimize("CCO")
>>> g = Gamess()
>>> r = g.run(m)
>>> r.total_energy
-152.127991054

Or use rdkit directly:

>>> from pygamess import Gamess
>>> from rdkit import Chem
>>> from rdkit.Chem import AllChem
>>> m = Chem.MolFromSmiles("CCO")
>>> m = Chem.AddHs(m)
>>> AllChem.EmbedMolecule(m)
0
>>> AllChem.UFFOptimizeMolecule(m,maxIters=200)
0
>>> g = Gamess()
>>> r = g.run(m)
>>> r.total_energy
-152.1279910526

The GamessOut object(r) contains the results of the GAMESS calculation and the RDKit Chem object with the calculation results:

>>> r.total_energy
-152.1279910526
>>> r.HOMO
-0.3453
>>> r.nHOMO
-0.3978
>>> r.LUMO
0.5594
>>> r.nLUMO
0.6127
>>> r.dipole_moment
[0.681619, -0.605188, 1.146253, 1.464497]
>>> r.orbital_energies
[-20.2521, -11.0932, -11.0402, -1.286, -0.9614, -0.7909, -0.6269, -0.5716, -0.5347, -0.4976, -0.4705, -0.3978, -0.3453, 0.5594, 0.6127, 0.6639, 0.69, 0.7002, 0.7388, 0.7549, 0.7852]
>>> r.mulliken_charges
[-0.171226, 0.024351, -0.298162, 0.049615, 0.055831, 0.061924, 0.042714, 0.061112, 0.173842]
>>> r.lowdin_charges
[-0.089262, 0.062464, -0.212689, 0.022024, 0.02752, 0.031644, 0.010235, 0.026611, 0.121453]

The RDKit Chem object has the same information to store these data into SDF:

>>> r.mol
<rdkit.Chem.rdchem.Mol object at 0x7ffd48217f30>
>>> r.mol.GetProp("total_energy")
'-152.12799105260001'
>>> r.mol.GetProp("HOMO")
'-0.3453'
>>> r.mol.GetProp("nHOMO")
'-0.39779999999999999'
>>> r.mol.GetProp("LUMO")
'0.55940000000000001'
>>> r.mol.GetProp("nLUMO")
'0.61270000000000002'
>>> r.mol.GetProp("dipole_moment")
'1.4644969999999999'
>>> r.mol.GetProp("dx")
'0.68161899999999997'
>>> r.mol.GetProp("dy")
'-0.60518799999999995'
>>> r.mol.GetProp("dz")
'1.146253'
>>> r.mol.GetProp("orbital_energies")
'-20.2521 -11.0932 -11.0402 -1.286 -0.9614 -0.7909 -0.6269 -0.5716 -0.5347 -0.4976 -0.4705 -0.3978 -0.3453 0.5594 0.6127 0.6639 0.69 0.7002 0.7388 0.7549 0.7852'
>>> for a in r.mol.GetAtoms():
...   print("{}:\t{:.4f}\t{:.4f}".format(a.GetSymbol(), float(a.GetProp("mulliken_charge")), float(a.GetProp("lowdin_charge"))))
... 
C:  -0.1712 -0.0893
C:  0.0244  0.0625
O:  -0.2982 -0.2127
H:  0.0496  0.0220
H:  0.0558  0.0275
H:  0.0619  0.0316
H:  0.0427  0.0102
H:  0.0611  0.0266
H:  0.1738  0.1215

Geometry optimization

Set the run_type as 'optimize'. This optimization process updates the coordinates of the molecule:

>>> from pygamess import Gamess
>>> from pygamess.utils import rdkit_optimize
>>> m = rdkit_optimize("CCO")
>>> g = Gamess()
>>> g.run_type('optimize')
>>> r = g.run(m)
>>> r.total_energy
-152.1330661028
>>> original_conf = m.GetConformer(0)
>>> optimized_conf = r.mol.GetConformer(0)
>>> for c in original_conf.GetPositions():
...   print(c)
... 
[ 0.91206647 -0.11944851 -0.1294722 ]
[-0.47153193  0.42043351  0.21118521]
[-1.44831334 -0.21539324 -0.56715297]
[ 0.9650486  -1.2050043   0.09903891]
[1.67955732 0.41189183 0.47186063]
[ 1.12654515  0.0378618  -1.20780162]
[-0.67995345  0.27545635  1.29552482]
[-0.49851483  1.50993204 -0.00177488]
[-1.58490399 -1.11572948 -0.17140791]
>>> for c in optimized_conf.GetPositions():
...   print(c)
... 
[ 0.91442972 -0.13086468 -0.12174822]
[-0.48373921  0.42850882  0.23169745]
[-1.54145595 -0.17763397 -0.52424945]
[ 0.97874385 -1.18768306  0.12185969]
[1.67944907 0.39674369 0.43935649]
[ 1.11452802 -0.00923776 -1.18177409]
[-0.65534535  0.31918718  1.31002371]
[-0.51450285  1.49751073  0.00304491]
[-1.4921073  -1.13653094 -0.2782105 ]

Or pass the options to a constractor::

>>> from pygamess import Gamess
>>> from pygamess.utils import rdkit_optimize
>>> m = rdkit_optimize("CCO")
>>> g = Gamess(options={"contrl":{"runtyp":"optimize"}})
>>> r = g.run(m)
>>> r.total_energy
-152.1330661279

Changing basis sets

Use basis_sets method:

>>> from pygamess import Gamess
>>> from pygamess.utils import rdkit_optimize
>>> m = rdkit_optimize("CCO")
>>> g = Gamess()
>>> g.run_type = "optimize"
>>> g.run(m).total_energy
-152.127991054
>>> g.basis_sets("3-21G")
>>> g.run(m).total_energy
-153.2170653562
>>> g.basis_sets("6-31G")
>>> g.run(m).total_energy
-154.0054866151
>>> g.basis_sets("6-31G*")
>>> g.run(m).total_energy
-154.0702703669
>>> g.basis_sets("6-31G**")
>>> g.run(m).total_energy
-154.0843823698

Or edit the basis attribute directly:

>>> g.options({'basis':{'gbasis': 'sto', 'ngauss': '3'}})
>>> g.run(m).total_energy
-152.127991054

Changing the electronic state

The ground state (default):

>>> from pygamess.utils import rdkit_optimize
>>> from pygamess import Gamess
>>> g = Gamess()
>>> g.basis_sets("6-31G*")
>>> m = rdkit_optimize("CCO")
>>> g.run_type("optimize")
>>> r = g.run(m)
>>> r.total_energy
-154.0755757352

The cationic state:

>>> g.scf_type("uhf")
>>> g.charge(1)
>>> g.multiplicity(2)
>>> r = g.run(m)
>>> r.total_energy
-153.7367666449

Or:

>>> g.options({"contrl":{"icharg": 1, "mult": 2, "scftyp": "uhf"}})
>>> r = g.run(m)
>>> r.total_energy
-153.7367666449

The anionic state:

>>> g.options({"contrl":{"icharg": -1, "mult": 2, "scftyp": "uhf"}})
>>> r = g.run(m)
>>> r.total_energy
-153.9302151707

The triplet state:

>>> g.options({"contrl":{"icharg": 0, "mult": 3, "scftyp": "uhf"}})
>>> r = g.run(m)
>>> r.total_energy
-153.9581403463

DFT calculation

B3LYP/6-31G*:

>>> from pygamess import Gamess
>>> from pygamess.utils import rdkit_optimize
>>> m = rdkit_optimize("CCO")
>>> g = Gamess()
>>> g.run_type("optimize")
>>> g.basis_sets("6-31G*")
>>> g.dft_type("B3LYP")
>>> g.run(m).total_energy
-154.9387962055

M062X/6-31G**:

>>> from pygamess import Gamess
>>> from pygamess.utils import rdkit_optimize
>>> m = rdkit_optimize("CCO")
>>> g = Gamess()
>>> g.run_type("optimize")
>>> g.dft_type("M06-2X")
>>> g.basis_sets("6-31G**")
>>> g.run(m).total_energy
-154.9636095207

PCM calculation

Pygamess currently only supports CPCM, but will support IEFPCM in the future:

>>> from pygamess import Gamess
>>> from pygamess.utils import rdkit_optimize
>>> m = rdkit_optimize("CCO")
>>> g = Gamess()
>>> g.basis_sets("6-31G*")
>>> g.pcm_type("water")
>>> g.run_type("optimize")
>>> r = g.run(m)
>>> r.total_energy
-154.0824604616
>>> r.internal_energy
-154.0748367584
>>> r.delta_internal_energy
0.0
>>> r.electrostatic_interaction
-0.0076237032
>>> r.pierotti_cavitation_energy
0.0
>>> r.dispersion_free_energy
0.0
>>> r.repulsion_free_energy
0.0
>>> r.total_interacion
-0.0076237032

TDDFT calculation

The example compound(Methyl yellow) was downloaded from PubchemQC project.

>>> from pygamess import Gamess
>>> from rdkit import Chem
>>> m = Chem.MolFromMolFile("examples/methyl_yellow.mol", removeHs=False)
>>> g = Gamess()
>>> g.dft_type("b3lyp", tddft=True)
>>> g.basis_sets("6-31G*")
>>> r = g.run(m)
>>> r.uv_spectra # (exitation ev, oscillator strength)
[('2.629', '0.0000'), ('3.217', '0.9349'), ('4.209', '0.0066'), ('4.263', '0.0020'), ('4.424', '0.1041'), ('4.779', '0.1068'), ('4.913', '0.0563'), ('4.940', '0.0001'), ('5.051', '0.0000'), ('5.430', '0.0006')]

• ref: 独習 量子化学計算(Self-study Quantum Chemical Calculations)

NMR spectra calculation

Optimizing the compound:

>>> from pygamess import Gamess
>>> from rdkit import Chem
>>> g = Gamess()
>>> from pygamess.utils import rdkit_optimize
>>> m = rdkit_optimize("C=CCBr")
>>> g.run_type("optimize")
>>> g.dft_type("b3lyp")
>>> g.basis_sets("6-31G*")
>>> r = g.run(m)
>>> with open("examples/C=CCBr.mol", "w") as f:
...   f.write(Chem.MolToMolBlock(r.mol))
... 

NMR spectra calculation (It takes a long time):

>>> from pygamess import Gamess
>>> from rdkit import Chem
>>> m = Chem.MolFromMolFile("examples/C=CCBr.mol", removeHs=False)
>>> g = Gamess(num_cores=1) # PARALLEL EXECUTION IS NOT ENABLED.
>>> g.basis_sets("6-31G*")
>>> g.run_type("nmr")
>>> r = g.run(m)
>>> r.isotropic_shielding
[79.8218, 68.6661, 157.7233, 2476.7501, 27.0851, 27.2072, 26.4652, 28.7654, 28.7932]

# NMR MAY BE COMPUTED ONLY FOR SCFTYP=RHF,
# NO CORRELATION OPTION (DFTTYP, CITYP, CCTYP, MPLEVL) MAY BE CHOSEN
# NO SEMI-EMPIRICAL OPTION (GBASIS=AM1/PM3/MNDO) MAY BE CHOSEN
# DIRECT AO INTEGRAL CALCULATION (DIRSCF) IS NOT ENABLED,
# AND/OR PARALLEL EXECUTION IS NOT ENABLED.

• ref: 独習 量子化学計算(Self-study Quantum Chemical Calculations)

Printing GAMESS INPUT

use input method:

>>> from pygamess import Gamess
>>> from pygamess.utils import rdkit_optimize
>>> m = rdkit_optimize("CO")
>>> g = Gamess()
>>> print(g.input(m))
$contrl scftyp=rhf runtyp=energy $end
$basis gbasis=sto ngauss=3 $end
$system mwords=100 $end
$DATA
6324
C1
C      6.0     -0.3577002260    0.0075902163   -0.0214817423 
O      8.0      0.9087355734   -0.5349924519   -0.2611189822 
H      1.0     -0.5468334701    0.0717914414    1.0721087268 
H      1.0     -0.4337681128    1.0193437527   -0.4757947304 
H      1.0     -1.1269974200   -0.6479305528   -0.4789564639 
H      1.0      1.5565636556    0.0841975943    0.1652431920 
$END

Parsing a GAMESS output file

use gparse:

>>> from pygamess.gamout_parser import gparse
>>> r = gparse("/somewhere/gamess.out")

Debugging pygamess

set PYGAMESS_DEBUG environment:

$ export PYGAMESS_DEBUG=1

This won't remove the all files generated by the GAMESS executable, including the output files.

set logger level:

>>> from pygamess import Gamess, logger
>>> import logging
>>> logger.setLevel(logging.DEBUG)
>>> g = Gamess()
DEBUG:pygamess.gamess:tmpdir: /var/folders/gm/4tcnnyqd09d2jt7p0dtvr28m0000gn/T/tmp889j9c7e

History

0.6.3 (2021-05-09)

• Support hessend (#8)
• Support TD-DFT (#2)
• Store the energy of each step during structural optimization (#7)
• Add the calculation condition into Chem object (#6)
• Support NMR calculation

0.6.2 (2021-05-05)

• Support options
• Add parser description

0.6.1 (2021-05-03)

• Fix bug (ModuleNotFoundError: No module named 'pygamess_utils')
• Change README format (rst -> md)

0.6.0 (2021-05-02)

• Support DFT calculation
• Support PCM calculation (C-PCM only)
• Improve the parser
• Support logger levels
• Change method name from "basis_set" to "basis_sets"

0.5.0 (2020-09-13)

• Support Python3

0.4.1.1 (2017-09-16)

• Update Readme

0.4.1 (2017-09-16)

• Bug fix (coordinates problem)

0.4.0 (2017-09-13)

• Change the backend library from openbabel to RDKit

0.3.0 (2012-03-31)

• Use internal rungms (default)
• Add basis_set method(STO-3G,3-21G,6-31G,6-311G,6-31G*,6-31G**,AM1,PM3,MNDO)
• Constructor can accept options
• Bug fixed (spin multiplicity)

0.2.2 (2012-03-30)

• Add charge settings
• Change Method name (gamess_input -> input)

0.2.1 (2012-03-23)

• Bug fix (multiplicity setting for pybel)
• Bug fix (print error when rungms exec failed)
• Add document

0.2.0 (2012-03-06)

• Run method accepts OBMol and Pybel-Molecule object

0.1.2 (2011-09-23)

• Add CIS method (and optimization)

0.1.1 (2011-08-06)

• Update document
• Semiempical method (AM1, PM3, MNDO)
• Add statpt option
• Change default error print message (10 lines)

0.1 (2011-6-25)

• First release