Cyclic References in Python

What this snippet does

Reference counting fails on cycles; Python's garbage collector periodically detects and cleans them.

Expected output

Cyclic refs require GC

Why practise typing this

Typing memory management code builds muscle memory for the symbols and indentation Python uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.

More Python practice

• Reference CountingMemory Management · advanced
• Del Method GCMemory Management · advanced
• Weak ReferenceMemory Management · advanced
• Weak CacheMemory Management · advanced
• Unreferable TypesMemory Management · advanced
• Dynamic TypingVariables & Types · beginner