Fix issue running setup.py egg_info

Since the main __init__.py imports most of the modules in the project,
it was not a good idea to add the `__version__` rariable there. While
doing:

```
from ravenpackapi import __version__
```

imported everything else, so when we run

```
python setup.py egg_info
```

For example, we would get errors like `No module named 'retry'`.
By storing the variable in a separate module, we can do some "tricks" to
import it in the `setup.py` but skipping the `__init__.py`.

Author: joserc87

ravenpackapi/__init__.py

@@ -1,4 +1,3 @@
-__version__ = "1.1.1"
 from .core import RPApi
 from .exceptions import ApiConnectionError
 from .models.dataset import Dataset

ravenpackapi/core.py

@@ -1,8 +1,6 @@
 import logging
 import os
-from platform import python_version
 
-from ravenpackapi import __version__
 from ravenpackapi.exceptions import get_exception
 from ravenpackapi.key_events.module import KeyEventsApi
 from ravenpackapi.models.dataset import Dataset
@@ -15,6 +13,7 @@
 from ravenpackapi.util import get_python_version, to_curl
 from ravenpackapi.utils.date_formats import as_date_str, as_datetime_str
 from ravenpackapi.utils.dynamic_sessions import DynamicSession
+from ravenpackapi.version import __version__
 
 _VALID_METHODS = ("get", "post", "put", "delete", "patch")
 

ravenpackapi/tests/unit/test_core.py

@@ -1,8 +1,8 @@
 import pytest
 
-from ravenpackapi import __version__
 from ravenpackapi.core import RPApi
 from ravenpackapi.util import get_python_version
+from ravenpackapi.version import __version__
 
 
 class TestRPApiRequests:

ravenpackapi/version.py

@@ -0,0 +1 @@
+__version__ = "1.1.1"

setup.py

@@ -1,6 +1,13 @@
+import sys
+
 from setuptools import find_packages, setup
 
-from ravenpackapi import __version__
+# Hack to get the version number from the package without importing the
+# __init__.py and all its dependencies.
+sys.path.insert(0, "./ravenpackapi/")
+__version__ = __import__("version").__version__
+sys.path = sys.path[1:]
+
 
 with open("README.rst") as readme_file:
     readme = readme_file.read()