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+# Naming conventions
+
+## C++
+
+### In the code:
+* The classes and functions of a package should be in a sub-namespace of the `Gudhi` namespace. The sub-namespace names are in lowercase and use underscore separators. E.g. `Gudhi::package_name::`
+* Concepts are named with camel case starting with uppercase. E.g. `PersistentHomology` for the concept of Persitence homology.
+* Classes start with an uppercase letter and use underscore separators. E.g. `Skeleton_blocker_contractor`.
+* Member functions and free functions are in lowercase and use underscore separators. E.g. `int num_vertices()`.
+* Constants and macros are in uppercase.
+* Macros should begin with the prefix `GUDHI_`.
+
+### File names:
+* All headers are named *.h and all sources are named *.cpp.
+* If a single class or function is provided in a file, its name (with the same letter case) should be used for the file name.
+* If a file does not contain a single class, its name should not begin with a capital letter.
+* Test files should be called `test_[what_is_tested].cpp`. E.g. `test_sparsify_point_set.cpp`
+* Example files should be called `example_[what_it_is].cpp`. E.g. `example_sparsify_point_set.cpp`
+
+### In CMakeLists.txt files:
+* The name of the "project" should be in this form: `Package_[tests|examples|…]`. E.g. `project(Simplex_tree_examples)`.
+* The name if each "target" (first parameter of add_executable) should be in this form: `Package_{name of the cpp file without extension}`. E.g `add_executable(Subsampling_test_sparsify_point_set test_sparsify_point_set.cpp)`.
+
+### Code style
+We are using [google c++ style guide](https://google.github.io/styleguide/cppguide.html) recommendations with 120 characters per line of code.
+[clang-format](https://clang.llvm.org/docs/ClangFormat.html) can be used to format automatically your code:
+```bash
+cd src # there is a .clang-format file with these specifications
+clang-format -style=file -i Simplex_tree/include/gudhi/Simplex_tree.h # -i means in place, your file will be modified
+```
+
+### Template
+Please use the file [following template](copyright_template.h).
+
+## Python
+
+In progress...
+
+### Code style
+We are using [PEP8 Python style guide](https://www.python.org/dev/peps/pep-0008/) recommendations with 120 characters per line of code.
+[black](https://black.readthedocs.io/en/stable/) can be used to format automatically your code:
+```bash
+black -l 120 src/python/example/bottleneck_basic_example.py
+```
+
+### Template
+Please use the file [following template](copyright_template.py).