conda list command broken (unknown variable: python_implementation)

Recently I had my conda environment raising a long error report when calling

conda list

One of the relevant error message refers to an unknown variable python_implementation.

raise SyntaxError('unknown variable: %s' % expr)
File "", line None
SyntaxError: unknown variable: python_implementation

My colleagues had no problems. From a fresh conda environment, no problem either. The fact is that some tools overwrote or deleted a package called xopen.

This fixed the problem for me:

conda install xopen

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