Complex-number literals raise JSON error in Python

[jakelishman]

Hello,

We use CodeClimate in a numerical Python library for quantum physics (QuTiP). I noticed that the duplication check errors out on Python files with complex literals in them (e.g. 1+1j), because they're reported as constant numerical values by the AST, but they can't be serialised directly to JSON.

For example, if I have a file complex.py with three different representations of the same complex literal:

def a():
    return 1 + 1j

def b():
    return 1+1j

def c():
    return (1+1J)

I run codeclimate analyze on it (setting mass_threshold: 1 in the configuration to be sure), but it reports no errors. Running it with debug on shows that it errored out in the parsing:

$ CODECLIMATE_DEBUG=1 codeclimate analyze complex.py
Starting analysis
I, [2021-06-16T17:08:13.904775 #1]  INFO -- : starting engine duplication
D, [2021-06-16T17:08:13.913623 #1] DEBUG -- : /config.json content: {"enabled"=>true, "config"=>{"languages"=>{"python"=>{"python_version"=>3, "mass_threshold"=>1}}}, "channel"=>"stable", "include_paths"=>["complex.py"], "debug"=>"1"}
D, [2021-06-16T17:08:13.936497 #1] DEBUG -- : docker run: ["docker", "run", "--name", "cc-engines-duplication-stable-9469e0f0-c421-4472-abf1-f5b5360dcaa8", "--cap-drop", "all", "--label", "com.codeclimate.label=550a3ba1-6b4f-4c1a-a0d7-16be3f7a0698", "--log-driver", "none", "--memory-swap", "-1", "--net", "none", "--rm", "--volume", "/Users/jake/tmp/complex:/code:ro", "--volume", "/tmp/cc/8997f528-5780-451e-81c2-d750bc7cfcd8:/config.json:ro", "--user", "9000:9000", "--memory", "1024000000", "codeclimate/codeclimate-duplication"]
D, [2021-06-16T17:08:14.336583 #1] DEBUG -- : engine stderr: 13
D, [2021-06-16T17:08:14.336766 #1] DEBUG -- : engine stderr: Parser process id: 13
D, [2021-06-16T17:08:14.338017 #1] DEBUG -- : engine stderr: codeclimate-parser socket not present
D, [2021-06-16T17:08:14.338164 #1] DEBUG -- : engine stderr: waiting 1s...
D, [2021-06-16T17:08:16.015964 #1] DEBUG -- : engine stderr: D, [2021-06-16T17:08:16.013924 #1] DEBUG -- : Processing 1 python files concurrency=2
D, [2021-06-16T17:08:16.016154 #1] DEBUG -- : engine stderr: /home/app/.rubies/ruby-2.5.1/lib/ruby/gems/2.5.0/gems/concurrent-ruby-1.0.0/lib/concurrent/atomic/mutex_atomic_fixnum.rb:80: warning: constant ::Fixnum is deprecated
D, [2021-06-16T17:08:16.018794 #1] DEBUG -- : engine stderr: D, [2021-06-16T17:08:16.015640 #1] DEBUG -- : Processing python file: complex.py
D, [2021-06-16T17:08:16.070863 #1] DEBUG -- : engine stderr: I, [2021-06-16T17:08:16.069556 #1]  INFO -- : Skipping file complex.py due to exception (CC::Engine::Analyzers::ParserError): `python3 /usr/src/app/lib/cc/engine/analyzers/python/parser.py` exited with code 1:
D, [2021-06-16T17:08:16.071149 #1] DEBUG -- : engine stderr: Traceback (most recent call last):
D, [2021-06-16T17:08:16.071247 #1] DEBUG -- : engine stderr:   File "/usr/src/app/lib/cc/engine/analyzers/python/parser.py", line 47, in <module>
D, [2021-06-16T17:08:16.071290 #1] DEBUG -- : engine stderr:     print(json.dumps(to_json(ast.parse(source))))
D, [2021-06-16T17:08:16.072500 #1] DEBUG -- : engine stderr:   File "/usr/local/python3/lib/python3.7/json/__init__.py", line 231, in dumps
D, [2021-06-16T17:08:16.072665 #1] DEBUG -- : engine stderr:     return _default_encoder.encode(obj)
D, [2021-06-16T17:08:16.072790 #1] DEBUG -- : engine stderr:   File "/usr/local/python3/lib/python3.7/json/encoder.py", line 199, in encode
D, [2021-06-16T17:08:16.072916 #1] DEBUG -- : engine stderr:     chunks = self.iterencode(o, _one_shot=True)
D, [2021-06-16T17:08:16.072970 #1] DEBUG -- : engine stderr:   File "/usr/local/python3/lib/python3.7/json/encoder.py", line 257, in iterencode
D, [2021-06-16T17:08:16.073069 #1] DEBUG -- : engine stderr:     return _iterencode(o, 0)
D, [2021-06-16T17:08:16.073165 #1] DEBUG -- : engine stderr:   File "/usr/local/python3/lib/python3.7/json/encoder.py", line 179, in default
D, [2021-06-16T17:08:16.073217 #1] DEBUG -- : engine stderr:     raise TypeError(f'Object of type {o.__class__.__name__} '
D, [2021-06-16T17:08:16.073252 #1] DEBUG -- : engine stderr: TypeError: Object of type complex is not JSON serializable
D, [2021-06-16T17:08:16.073348 #1] DEBUG -- : engine stderr:
D, [2021-06-16T17:08:16.074902 #1] DEBUG -- : engine stderr: /usr/src/app/lib/cc/engine/analyzers/command_line_runner.rb:26:in `block in run'
D, [2021-06-16T17:08:16.075792 #1] DEBUG -- : engine stderr: /home/app/.rubies/ruby-2.5.1/lib/ruby/2.5.0/timeout.rb:93:in `block in timeout'
D, [2021-06-16T17:08:16.076834 #1] DEBUG -- : engine stderr: /home/app/.rubies/ruby-2.5.1/lib/ruby/2.5.0/timeout.rb:33:in `block in catch'
D, [2021-06-16T17:08:16.078338 #1] DEBUG -- : engine stderr: /home/app/.rubies/ruby-2.5.1/lib/ruby/2.5.0/timeout.rb:33:in `catch'
D, [2021-06-16T17:08:16.078990 #1] DEBUG -- : engine stderr: /home/app/.rubies/ruby-2.5.1/lib/ruby/2.5.0/timeout.rb:33:in `catch'
D, [2021-06-16T17:08:16.081147 #1] DEBUG -- : engine stderr: /home/app/.rubies/ruby-2.5.1/lib/ruby/2.5.0/timeout.rb:108:in `timeout'
D, [2021-06-16T17:08:16.081442 #1] DEBUG -- : engine stderr: /usr/src/app/lib/cc/engine/analyzers/command_line_runner.rb:18:in `run'
D, [2021-06-16T17:08:16.082227 #1] DEBUG -- : engine stderr: /usr/src/app/lib/cc/engine/analyzers/python/parser.rb:23:in `parse'
D, [2021-06-16T17:08:16.083131 #1] DEBUG -- : engine stderr: /usr/src/app/lib/cc/engine/analyzers/python/main.rb:26:in `process_file'
D, [2021-06-16T17:08:16.083798 #1] DEBUG -- : engine stderr: /usr/src/app/lib/cc/engine/analyzers/analyzer_base.rb:41:in `run'
D, [2021-06-16T17:08:16.083935 #1] DEBUG -- : engine stderr: /usr/src/app/lib/cc/engine/analyzers/reporter.rb:76:in `block in process_files'
D, [2021-06-16T17:08:16.083999 #1] DEBUG -- : engine stderr: /usr/src/app/lib/cc/engine/analyzers/file_thread_pool.rb:24:in `block (2 levels) in run'
D, [2021-06-16T17:08:16.084422 #1] DEBUG -- : engine stderr: D, [2021-06-16T17:08:16.070274 #1] DEBUG -- : Processed 1 python files
D, [2021-06-16T17:08:16.084603 #1] DEBUG -- : engine stderr: D, [2021-06-16T17:08:16.081480 #1] DEBUG -- : Reported 0 violations...
I, [2021-06-16T17:08:16.192031 #1]  INFO -- : finished engine duplication

Analysis complete! Found 0 issues.

This is the case with both Python 2 and Python 3.