[Samples] Add ck2yaml demo to python examples

interfaces/cython/cantera/examples/input/ck2yaml_demo.py

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+"""
+Illustrate conversion of chemkin input files to cantera yaml input files.
+
+The script runs the conversion utility `ck2yaml` as a shell command. The
+following GRI-3.0 derived input files are re-created:
+ * gri30.yaml (without deprecated phases)
+ * h2o2.yaml
+ * air.yaml
+ * argon.yaml
+ * airNASA9.yaml
+ * nasa.yaml
+ * silane.yaml
+
+Requires: cantera >= 2.5.0
+"""
+
+import subprocess
+
+opt = {}
+
+# options for gri30.yaml
+opt['gri30'] = ["--input=gri30.inp", "--output=gri30.yaml",
+                "--thermo=gri30_thermo.dat", "--transport=gri30_tran.dat",
+                "--name=gri30", "--bibtex=gri30.bib"]
+
+# options for h2o2.yaml
+opt['h2o2'] = ["--input=h2o2.inp", "--output=h2o2.yaml",
+               "--transport=gri30_tran.dat",
+               "--name=ohmech"]
+
+# options for air.yaml
+opt['air'] = ["--input=air.inp", "--output=air.yaml",
+              "--transport=gri30_tran.dat",
+              "--name=air"]
+
+# options for argon.yaml (the --quiet option suppresses warnings about
+# unexpected/unused species in thermo data)
+opt['argon'] = ["--input=argon.inp", "--output=argon.yaml",
+                "--thermo=gri30_thermo.dat", "--transport=gri30_tran.dat",
+                "--name=argon", "--quiet"]
+
+# options for airNASA9.yaml
+opt['airNASA9'] = ["--input=airNASA9.inp", "--output=airNASA9.yaml",
+                   "--thermo=airDataNASA9.dat",
+                   "--name=airNASA9", "--bibtex=airNASA9.bib"]
+
+# options for nasa.yaml
+opt['nasa'] = ["--thermo=nasathermo.dat", "--output=nasa.yaml",
+               "--permissive"]
+
+# options for silane.yaml (during validation, discontinuities of
+# thermodynamic properties are detected)
+opt['silane'] = ["--input=silane.inp", "--output=silane.yaml"]
+
+# display help text
+print('Executing shell command:')
+print('ck2yaml --help\n')
+subprocess.run(['ck2yaml', '--help'])
+
+for o in opt:
+
+    # print command
+    print('\nExecuting shell command to create `{}.yaml`:'.format(o))
+    print('ck2yaml {}\n'.format(' '.join(opt[o])))
+    subprocess.run(['ck2yaml'] + opt[o])