import pip
pip.main(args=['install', 'requests'])

py3

import os
help(os.access)

Help on built-in function access in module posix:

access(path, mode, *, dir_fd=None, effective_ids=False, follow_symlinks=True)
    Use the real uid/gid to test for access to a path.
    
      path
        Path to be tested; can be string, bytes, or open-file-descriptor int.
      mode
        Operating-system mode bitfield.  Can be F_OK to test existence,
        or the inclusive-OR of R_OK, W_OK, and X_OK.
      dir_fd
        If not None, it should be a file descriptor open to a directory,
        and path should be relative; path will then be relative to that
        directory.
      effective_ids
        If True, access will use the effective uid/gid instead of
        the real uid/gid.
      follow_symlinks
        If False, and the last element of the path is a symbolic link,
        access will examine the symbolic link itself instead of the file
        the link points to.
    
    dir_fd, effective_ids, and follow_symlinks may not be implemented
      on your platform.  If they are unavailable, using them will raise a
      NotImplementedError.
    
    Note that most operations will use the effective uid/gid, therefore this
      routine can be used in a suid/sgid environment to test if the invoking user
      has the specified access to the path.