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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def check(jail=None,
          chroot=None,
          root=None,
          depends=False,
          recompute=False,
          checksum=False):
    '''
    Sanity checks installed packages

    jail
        Perform the sanity check in the specified jail

        CLI Example:

        .. code-block:: bash

            salt '*' pkg.check jail=<jail name or id>

    chroot
        Perform the sanity check in the specified chroot (ignored if ``jail``
        is specified)

    root
        Perform the sanity check in the specified root (ignored if ``jail``
        is specified)

        CLI Example:

        .. code-block:: bash

            salt '*' pkg.check chroot=/path/to/chroot


    Of the below, at least one must be set to ``True``.

    depends
        Check for and install missing dependencies.

        CLI Example:

        .. code-block:: bash

            salt '*' pkg.check recompute=True

    recompute
        Recompute sizes and checksums of installed packages.

        CLI Example:

        .. code-block:: bash

            salt '*' pkg.check depends=True

    checksum
        Find invalid checksums for installed packages.

        CLI Example:

        .. code-block:: bash

            salt '*' pkg.check checksum=True
    '''
    if not any((depends, recompute, checksum)):
        return 'One of depends, recompute, or checksum must be set to True'

    opts = ''
    if depends:
        opts += 'dy'
    if recompute:
        opts += 'r'
    if checksum:
        opts += 's'

    cmd = _pkg(jail, chroot, root)
    cmd.append('check')
    if opts:
        cmd.append('-' + opts)
    return __salt__['cmd.run'](
        cmd,
        output_loglevel='trace',
        python_shell=False
    )