diff --git a/solventmapcreator/io/__init__.py b/solventmapcreator/io/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/solventmapcreator/solvationcalculation/__init__.py b/solventmapcreator/solvationcalculation/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/solventmapcreator/test/__init__.py b/solventmapcreator/test/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/solventmapcreator/test/iotest/__init__.py b/solventmapcreator/test/iotest/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/solventmapcreator/test/solvationcalculationtest/__init__.py b/solventmapcreator/test/solvationcalculationtest/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391