Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory \\METADATA

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TL;DR:

Problem: Long install path

Solution 1: Install the desired python package (in my case tensorflow) in the folder which has a shorter path (for example C:/my_py_packages/some_package)

Solution 2: Set the registry value HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem@LongPathsEnabled to 1 as mentioned here.

Original answer:
I got here by having this kind of error when I tried installing tensorflow library. My error was the following:

Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: ‘c:\moj
ifajlovi\faks\11master\1semestar\siap-sistemizaistrazivanjeianalizupodataka_(datamining)\projek
at\rad\venvs\siap_venv\Lib\site-packages\tensorflow_estimator\python\estimator\canned\line
ar_optimizer\python\utils\pycache\sharded_mutable_dense_hashtable.cpython-37.pyc’

So, there was no sharded_mutable_dense_hashtable.cpython-37.pyc file in the __pycache__ directory. But, sharded_mutable_dense_hashtable.cpython-37.pyc file was in the utils directory (which is the parent directory of __pycache__ directory).

That’s why I tried manually copying the sharded_mutable_dense_hashtable.cpython-37.pyc file in the __pycache__ directory. When I tried that, I had a copy error which stated that the path was too long, so it couldn’t put the file in the directory.

So, the solution:

Install the desired python package (in my case tensorflow) in the folder which has a shorter path (for example C:/my_py_packages/some_package) or set the registry value HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem@LongPathsEnabled to 1 as mentioned here.

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