julia> ENV["PYTHON"]=""
""
julia> using Pkg
julia> Pkg.build("TensorFlow")
Building Arpack ──────────→ `~/.julia/packages/Arpack/UiiMc/deps/build.log`
Building SpecialFunctions → `~/.julia/packages/SpecialFunctions/sXbz6/deps/build.log`
Building Rmath ───────────→ `~/.julia/packages/Rmath/Py9gH/deps/build.log`
Building Conda ───────────→ `~/.julia/packages/Conda/uQitS/deps/build.log`
...