fortranformat 1.0.1

Mimics Fortran textual IO in Python

FORTRAN format interpreter for Python

Generates text from a Python list of variables or will read a line of text into Python variables according to the FORTRAN format statement passed.

Licensed under the MIT license

The library is extensively unit-tested against the Intel FORTRAN compiler on a Linux platform. Differences between platforms/compilers are generally minor.

To read Fortran records,

import fortranformat as ff
header_line = FortranRecordReader('(A15, A15, A15)')
header_line.read('              x              y              z')
['              x', '              y', '              z']
line = FortranRecordReader('(3F15.3)')
line.read('          1.000          0.000          0.500')
# Returns [1.0, 0.0, 0.5]
line.read('          1.100          0.100          0.600')
# Returns [1.1, 0.1, 0.6]

To write Fortran records,

import fortranformat as ff
header_line = FortranRecordWriter('(A15, A15, A15)')
header_line.write(['x', 'y', 'z'])
# Results in '              x              y              z'
line = FortranRecordWriter('(3F15.3)')
line.write([1.0, 0.0, 0.5])
# Results in '          1.000          0.000          0.500'
line.write([1.1, 0.1, 0.6])
# Results in '          1.100          0.100          0.600'

For more detailed usage, see the guide.

Notes

• At present the library mimics the IO of the Intel FORTRAN compiler v.9.1 run on a Linux system. Differences to other FORTRAN compilers and platforms are generally minor.
• The library should run on Python versions from at least 2.7

Development

Generating the tests for a FORTRAN compiler

The bulk of the tests are auto generated using Python scripts located in tests/autogen/generate. The tests were generated as follows ...

1. Configure gen_input_tests.py for your particular FORTRAN compiler
2. Run the above scripts to generate the .test files in the relevant raw directory under the tests/autogen/input directory. These generate, compile and execute hundreds of combinations of edit descriptor in the FORTRAN compiler under test and saves the results in the .test files
3. Repeat for the 'output' tests
4. Run build_unittests.py to generate Python test files based on the generated .test files

Running tests

Make sure that nose tests is installed and run using

sh scripts/runtests.sh

Note some of the Z input edit descriptor tests fail because in FORTRAN they overflow whereas Python can handle arbitrarily large integers

Some of the F output edit descriptors fail due to precision issues

Deploying a new package version

Update versions in setup.py and __init__.py

To create a local build to test run ...

python setup.py build sdist --formats=gztar bdist_wininst

To upload a version to PyPI run ...

python setup.py sdist --formats=gztar bdist_wininst upload

Bugs

Although the library has a large body of automatically generated test code behind it, it has not been extensively user tested. Bug reports are welcome!

Please report bugs to,

https://github.com/brendanarnold/py-fortranformat/issues