Fortran 90 namelist parser
Project description
A Python module for parsing Fortran namelist files
About f90nml
The f90nml module takes a Fortran 90 namelist file and parses it into a Python dict of namelist groups, each containing a dict of its variables. Fortran data types are converted to equivalent Python types.
Usage
To read a Fortran namelist file as a dict, use the read() method:
nml = f90nml.read(nml_filename)
To output a Python dict as a Fortran namelist file, use the write() method:
nml.write(output_filename)
This method will abort if the output file already exists.
Additional Features
Derived types
Additional NmlDicts are created to traverse user-defined types. For example, if you want to access z in the following namelist:
&dtype_nml
x%y%z = 1
/
then z can be accessed in the equivalent namelist nml by typing
z = nml['dtype_nml']['x']['y']['z']
Overwriting an existing file
To overwrite an existing file when using the write method, use the force flag:
nml.write(nml_filename, force=True)
Notes
The read method produces an NmlDict, which behaves as a dict with case-insensitive keys, due to the case insensitivity of Fortran. This implementation is currently not a true case-insensitive dict, and is only intended to accommodate individual references and assignments.
In a Fortran executable, the data types of values in the namelist files are set by the corresponding variables within the program, and cannot in general be determined from the namelist file alone. Therefore, f90nml only makes an approximate guess about its data type.
The following namelist features are currently not supported:
Multidimensional vector assignment (v(:,:) = 1, 2, 3, 4)
Upcast vector elements if components differ (x(i) = 1, x(j) = 2.0)
stdin/stdout support (?, ?=)
Licensing
f90nml is distributed under the Apache 2.0 License.
Contact
Marshall Ward <python@marshallward.org>
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