f90nml - a Python Module for Parsing Fortran Namelist Files. 90nml - A Fortran namelist parser, generator, and editor, f90nml is a Python module and command line tool that provides a simple interface for the reading, writing, and modifying Fortran namelist files. A namelist file is parsed and converted into an Namelist object, which behaves like a standard Python dict. Values are converted from Fortran data types to equivalent primitive Python types. The command line tool f90nml can be used to modify individual values inside of a shell environment. It can also be used to convert the data between namelists and other configuration formats. JSON and YAML formats are currently supported.