(reuse-py3.10) ⬢ 📺 carmenbianca reuse-tool $ echo 'SPDX-License-Identifier: <invalid>' > foo.py
(reuse-py3.10) ⬢ 📺 carmenbianca reuse-tool $ reuse lint
# MISSING LICENSES

'<invalid>' found in:
* foo.py

# INVALID SPDX LICENSE EXPRESSIONS

'foo.py' contains invalid SPDX License Expressions:
* <invalid>

# MISSING COPYRIGHT AND LICENSING INFORMATION

The following files have no copyright information:
* foo.py

# SUMMARY

* Bad licenses: 0
* Deprecated licenses: 0
* Licenses without file extension: 0
* Missing licenses: <invalid>
* Unused licenses: 0
* Used licenses: <invalid>, Apache-2.0, CC-BY-SA-4.0, CC0-1.0, GPL-3.0-or-later
* Read errors: 0
* Invalid SPDX License Expressions: 1
* Files with copyright information: 136 / 137
* Files with license information: 137 / 137

Unfortunately, your project is not compliant with version 3.3 of the REUSE Specification :-(


# RECOMMENDATIONS

* Fix missing licenses: For at least one of the license identifiers provided by
  the 'SPDX-License-Identifier' tags, there is no corresponding license text
  file in the 'LICENSES' directory. For SPDX license identifiers, you can simply
  run 'reuse download --all' to get any missing ones. For custom licenses
  (starting with 'LicenseRef-'), you need to add these files yourself.
* Fix invalid SPDX License Expressions: In one or more files there are SPDX
  License Expressions which cannot be parse. Check whether the value that
  follows 'SPDX-License-Identifier:' is correct. If the detected expression is
  not meant to be valid, put it between 'REUSE-IgnoreStart' and 'REUSE-
  IgnoreEnd' comments.
* Fix missing copyright/licensing information: For one or more files, the tool
  cannot find copyright and/or licensing information. You typically do this by
  adding 'SPDX-FileCopyrightText' and 'SPDX-License-Identifier' tags to each
  file. The tutorial explains additional ways to do this:
  <https://reuse.software/tutorial/>

(reuse-py3.10) ⬢ 📺 carmenbianca reuse-tool $ reuse lint --lines
foo.py: missing license '<invalid>'
foo.py: invalid SPDX License Expression '<invalid>'
foo.py: no copyright notice