QGIS corrupted plugins upon reinstallation

Question

I had various bugs in my GIS softwares (QGIS, ArcGIS) after uninstalling PyCharm from my computer (time limited school license). For a school assignment we had to change the PythonPATH and PythonHOME and after uninstalling the said IDE, some plugins stoped working in QGIS.

I uninstalled the programs, ran CCleaner to remove old registries and just re-installed these:

• ArcGIS 10.2
• OSGeo4W (including QGIS Lyon 2.12.3)
• OpenGeoSuite 4.8 (without QGIS)
• Python 2.7
• PyScripter

Now the Processing toolbox and other plugins are corrupted and there is this error message:

AttributeError: 'module' object has no attribute 'openssl_md_meth_names'

Also, when the program starts I have other Python errors.

Impossible to load fTools plugin provokes error when calling classFactory()

(translated from french)

Here's the logfile:

Traceback (most recent call last):
              File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 306, in startPlugin
                plugins[packageName] = package.classFactory(iface)
              File "C:/OSGEO4~1/apps/qgis/./python/plugins\fTools\__init__.py", line 33, in classFactory
                from .fTools import fToolsPlugin
              File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 572, in _import
                mod = _builtin_import(name, globals, locals, fromlist, level)
              File "C:/OSGEO4~1/apps/qgis/./python/plugins\fTools\fTools.py", line 52, in <module>
                import doRandom
              File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 572, in _import
                mod = _builtin_import(name, globals, locals, fromlist, level)
              File "C:\OSGEO4~1\apps\qgis\python\plugins\fTools\tools\doRandom.py", line 37, in <module>
                import random
              File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 572, in _import
                mod = _builtin_import(name, globals, locals, fromlist, level)
              File "C:\Python27\Lib\random.py", line 49, in <module>
                import hashlib as _hashlib
              File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 572, in _import
                mod = _builtin_import(name, globals, locals, fromlist, level)
              File "C:\Python27\Lib\hashlib.py", line 138, in <module>
                _hashlib.openssl_md_meth_names)
            AttributeError: 'module' object has no attribute 'openssl_md_meth_names'

Answer 1

Cleaning registries and re-installations did not solve the problem.

I opened C:\Python27\Lib\hashlib.py (the problematic file) in Notepad++ and checked on line 138 (where the problem was specified) and compared it to the same file on an other computer, where QGIS works correctly.

Note: I only edited the python file, not the compiled python file.

I found 2 extra command lines that I commented out (using #) for the code to be like the one on the working computer.

I saved the file, re-opened QGIS and found no error and geoprocessing tool back.

Here are the 2 extra lines that I commented out in case someone else gets a similar problem:

(first line = 133)

try:
    import _hashlib
    new = __hash_new
    __get_hash = __get_openssl_constructor
#    algorithms_available = algorithms_available.union(
#        _hashlib.openssl_md_meth_names)
except ImportError:
    new = __py_new
    __get_hash = __get_builtin_constructor

(last line = 141)