diff --git a/CHANGELOG b/CHANGELOG
index da8cdd4..74c7922 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -6,6 +6,8 @@ Improvements:
   * SemanticVersion class added
   * MetadataVersion class added to easily manipulate metadata versions.
   * runtime_metadata_factory function to parse and validate runtime packages.
+  * __str__ is now implemented for EPDPlatform. The implementation support
+    EPDPlatform.from_epd_string(str(epd_platform)) == epd_platform (#117)
 
 2015-00-01   0.10.0:
 --------------------
diff --git a/okonomiyaki/platforms/epd_platform.py b/okonomiyaki/platforms/epd_platform.py
index 433605a..33ab4bd 100644
--- a/okonomiyaki/platforms/epd_platform.py
+++ b/okonomiyaki/platforms/epd_platform.py
@@ -252,6 +252,9 @@ class EPDPlatform(HasTraits):
     def short(self):
         return "{0}-{1}".format(self.platform_name, self.arch_bits)
 
+    def __str__(self):
+        return "{0.platform_name}_{0.arch}".format(self)
+
     def __eq__(self, other):
         if not isinstance(other, self.__class__):
             return False

Implement str(epd_platform)
Should look as follows:

```python
>>> platform = EPDPlatform.from_epd_string("rh5-64")
>>> str(platform)
rh5_x86_64
```
diff --git a/okonomiyaki/platforms/tests/test_epd_platform.py b/okonomiyaki/platforms/tests/test_epd_platform.py
index 9dfa96e..e159950 100644
--- a/okonomiyaki/platforms/tests/test_epd_platform.py
+++ b/okonomiyaki/platforms/tests/test_epd_platform.py
@@ -161,6 +161,28 @@ class TestEPDPlatform(unittest.TestCase):
             epd_platform = EPDPlatform.from_running_system("amd64")
             self.assertEqual(epd_platform.short, "rh5-64")
 
+    def test_str(self):
+        # Given
+        epd_platform = EPDPlatform.from_epd_string("rh5-64")
+
+        # When/Then
+        self.assertEqual(str(epd_platform), "rh5_x86_64")
+
+        # Given
+        epd_platform = EPDPlatform.from_epd_string("osx-32")
+
+        # When/Then
+        self.assertEqual(str(epd_platform), "osx_x86")
+
+        # Given
+        s = "osx_x86"
+
+        # When
+        epd_platform = EPDPlatform.from_epd_string(s)
+
+        # Then
+        self.assertEqual(str(epd_platform), s)
+
 
 class TestEPDPlatformApplies(unittest.TestCase):
     @mock_centos_5_8

pip install -e .[dev]
parse_log_pytest
requirements.txt
pytest pytest-cov
apt-get update apt-get install -y gcc
3.9
dev_requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
attrs==25.3.0
coverage==7.8.0
docutils==0.21.2
enum34==1.1.10
exceptiongroup==1.2.2
flake8==7.2.0
haas==0.9.0
iniconfig==2.1.0
jsonschema==4.23.0
jsonschema-specifications==2024.10.1
mccabe==0.7.0
mock==1.0.1
-e git+https://github.com/enthought/okonomiyaki.git@9830662935a3432c0619f60bf72dd1f312f0f2a8#egg=okonomiyaki
packaging==24.2
pbr==6.1.1
pluggy==1.5.0
pycodestyle==2.13.0
pyflakes==3.3.2
pytest==8.3.5
pytest-cov==6.0.0
referencing==0.36.2
rpds-py==0.24.0
six==1.17.0
statistics==1.0.3.5
stevedore==4.1.1
tomli==2.2.1
typing_extensions==4.13.0
zipfile2==0.0.12

name: okonomiyaki
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.4.4=h6a678d5_1
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=3.0.16=h5eee18b_0
  - pip=25.0=py39h06a4308_0
  - python=3.9.21=he870216_1
  - readline=8.2=h5eee18b_0
  - setuptools=75.8.0=py39h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - tzdata=2025a=h04d1e81_0
  - wheel=0.45.1=py39h06a4308_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - attrs==25.3.0
      - coverage==7.8.0
      - docutils==0.21.2
      - enum34==1.1.10
      - exceptiongroup==1.2.2
      - flake8==7.2.0
      - haas==0.9.0
      - iniconfig==2.1.0
      - jsonschema==4.23.0
      - jsonschema-specifications==2024.10.1
      - mccabe==0.7.0
      - mock==1.0.1
      - packaging==24.2
      - pbr==6.1.1
      - pluggy==1.5.0
      - pycodestyle==2.13.0
      - pyflakes==3.3.2
      - pytest==8.3.5
      - pytest-cov==6.0.0
      - referencing==0.36.2
      - rpds-py==0.24.0
      - six==1.17.0
      - statistics==1.0.3.5
      - stevedore==4.1.1
      - tomli==2.2.1
      - typing-extensions==4.13.0
      - zipfile2==0.0.12
prefix: /opt/conda/envs/okonomiyaki

okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatform::test_str
okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatform::test_guessed_epd_platform okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatformApplies::test_all okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatformApplies::test_applies_rh okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatformApplies::test_current_linux okonomiyaki/platforms/tests/test_epd_platform.py::TestGuessEPDPlatform::test_guess_linux2_platform okonomiyaki/platforms/tests/test_epd_platform.py::TestGuessEPDPlatform::test_guess_linux2_unsupported
okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatform::test_epd_platform_from_string okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatform::test_epd_platform_from_string_new_arch okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatform::test_epd_platform_from_string_new_names okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatform::test_epd_platform_from_string_new_names_underscore okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatform::test_from_running_python okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatform::test_from_running_system okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatform::test_short_names_consistency okonomiyaki/platforms/tests/test_epd_platform.py::TestEPDPlatformApplies::test_current_windows okonomiyaki/platforms/tests/test_epd_platform.py::TestGuessEPDPlatform::test_from_epd_platform_string okonomiyaki/platforms/tests/test_epd_platform.py::TestGuessEPDPlatform::test_from_epd_platform_string_invalid okonomiyaki/platforms/tests/test_epd_platform.py::TestGuessEPDPlatform::test_from_spec_depend_data okonomiyaki/platforms/tests/test_epd_platform.py::TestGuessEPDPlatform::test_guess_darwin_platform okonomiyaki/platforms/tests/test_epd_platform.py::TestGuessEPDPlatform::test_guess_solaris_unsupported okonomiyaki/platforms/tests/test_epd_platform.py::TestGuessEPDPlatform::test_guess_win32_platform
okonomiyaki/platforms/epd_platform.py CHANGELOG
okonomiyaki/platforms/epd_platform.py CHANGELOG