Cannot install GIS4WRF in QGIS 3.4 on Windows: No module named pip

[dmey]

After upgrading to QGIS 3.4, GIS4WRF fails to install dependencies: No module named pip.

Couldn't load plugin 'gis4wrf' due to an error when calling its classFactory() method 

RuntimeError: GIS4WRF: Error installing Python packages Log: Added C:\Users\Testing\AppData\Local\gis4wrf\python37 as module search pathAdded C:\Users\Testing\AppData\Local\gis4wrf\python37\lib\site-packages as module search pathPackage directory: C:\Users\Testing\AppData\Local\gis4wrf\python37C:\Program Files\QGIS 3.4\bin\python-qgis.bat -m pip install --prefix C:\Users\Testing\AppData\Local\gis4wrf\python37 f90nml==1.0.2 netCDF4==1.2.9C:\PROGRA~1\QGIS3~1.4\apps\Python37\python.exe: No module named pip 
Traceback (most recent call last):
  File "C:/Users/Testing/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gis4wrf\__init__.py", line 39, in bootstrap_with_ui
    for msg_type, msg_val in bootstrap():
  File "C:/Users/Testing/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gis4wrf\bootstrap.py", line 197, in bootstrap
    for line in run_subprocess(args, LOG_PATH):
  File "C:/Users/Testing/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gis4wrf\bootstrap.py", line 226, in run_subprocess
    raise subprocess.CalledProcessError(process.returncode, args)
subprocess.CalledProcessError: Command '['C:\\Program Files\\QGIS 3.4\\bin\\python-qgis.bat', '-m', 'pip', 'install', '--prefix', 'C:\\Users\\Testing\\AppData\\Local\\gis4wrf\\python37', 'f90nml==1.0.2', 'netCDF4==1.2.9']' returned non-zero exit status 1.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:/PROGRA~1/QGIS3~1.4/apps/qgis/./python\qgis\utils.py", line 335, in startPlugin
    plugins[packageName] = package.classFactory(iface)
  File "C:/Users/Testing/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gis4wrf\__init__.py", line 22, in classFactory
    bootstrap_with_ui(iface)
  File "C:/Users/Testing/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gis4wrf\__init__.py", line 62, in bootstrap_with_ui
    raise RuntimeError(PLUGIN_NAME + ': Error installing Python packages\nLog:\n' + log) from e
RuntimeError: GIS4WRF: Error installing Python packages
Log:
Added C:\Users\Testing\AppData\Local\gis4wrf\python37 as module search pathAdded C:\Users\Testing\AppData\Local\gis4wrf\python37\lib\site-packages as module search pathPackage directory: C:\Users\Testing\AppData\Local\gis4wrf\python37C:\Program Files\QGIS 3.4\bin\python-qgis.bat -m pip install --prefix C:\Users\Testing\AppData\Local\gis4wrf\python37 f90nml==1.0.2 netCDF4==1.2.9C:\PROGRA~1\QGIS3~1.4\apps\Python37\python.exe: No module named pip



Python version: 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)] 
QGIS version: 3.4.0-Madeira Madeira, 4a4b62ed19 

Python Path:
C:/PROGRA~1/QGIS3~1.4/apps/qgis/./python
C:/Users/Testing/AppData/Roaming/QGIS/QGIS3\profiles\default/python
C:/Users/Testing/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins
C:/PROGRA~1/QGIS3~1.4/apps/qgis/./python/plugins
C:\Program Files\QGIS 3.4\bin\python37.zip
C:\PROGRA~1\QGIS3~1.4\apps\Python37\DLLs
C:\PROGRA~1\QGIS3~1.4\apps\Python37\lib
C:\Program Files\QGIS 3.4\bin
C:\PROGRA~1\QGIS3~1.4\apps\Python37
C:\PROGRA~1\QGIS3~1.4\apps\Python37\lib\site-packages
C:\PROGRA~1\QGIS3~1.4\apps\Python37\lib\site-packages\win32
C:\PROGRA~1\QGIS3~1.4\apps\Python37\lib\site-packages\win32\lib
C:\PROGRA~1\QGIS3~1.4\apps\Python37\lib\site-packages\Pythonwin
C:/Users/Testing/AppData/Roaming/QGIS/QGIS3\profiles\default/python
C:\Users\Testing\AppData\Local\gis4wrf\python37
C:\Users\Testing\AppData\Local\gis4wrf\python37\lib\site-packages

[letmaik]

Reported at https://issues.qgis.org/issues/20249.

[dmey]

I have mitigated this with a hot-fix (#99) release for now until the QGIS team resolves this issue.

[dmey]

Fixed in https://issues.qgis.org/issues/20249 and available in QGIS 3.4.1.

[dmey]

I will close this once we finish testing and make GIS4WRF available on QGIS 3.4.1