conda install psycopg2 errors

Question

New mackbookpro running Catalina. Installed anaconda using homebrew. Tried to install psycopg2 using the command conda install -c anaconda psycopg2 but failed due to package conflicts. Here's some of the output from the attempted install:

$ conda install -c anaconda psycopg2
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: / 
Found conflicts! Looking for incompatible packages.
This can take several minutes.  Press CTRL-C to abort.
failed                                                                                                                                                \ 

UnsatisfiableError: The following specifications were found to be incompatible with each other:

Output in format: Requested package -> Available versions

Package six conflicts for:
pyopenssl -> cryptography[version='>=2.8'] -> six[version='>=1.4.1']
pytest-doctestplus -> pytest[version='>=3.0'] -> six[version='>=1.10.0']
python-dateutil -> six[version='>=1.5']
nltk -> six

Any thoughts on what's happening or how to fix?

Answer 1

The reason might be there are too many conflicts between [anaconda==2020.02] and [70+ PACKAGES] Try the following worked for me:

conda -V conda update -n base conda

To ensure you are in version conda 4.8.2 Then

conda update --all

Then the following packages will be DOWNGRADED:

anaconda 2020.02-py37_0 --> custom-py37_1

Then

conda install psycopg2

Then packages libpq,psycopg2 would be installed, some packages would be updated, some packages would be superseded by higher-priority channel.