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Short summary

Python variables are names bound to objects, not boxes holding values. The key distinction is mutation (modifying the object at a memory address, visible to all names pointing there) versus rebinding (pointing a name at a different address, invisible to other names). The += operator mutates mutable objects like lists but rebinds immutable objects like integers. Shallow copies share inner object references, so mutating nested elements affects both copies. Two diagnostic questions resolve most mutation bugs: is another name pointing to the same object, and was this a rebinding?

• •Python variables are name-to-object bindings, not boxes; mutation changes the object, rebinding changes the name pointer
• •+= mutates mutable objects (lists) but rebinds immutable objects (integers), explaining divergent behavior
• •Shallow copies share inner references; mutating nested elements affects both original and copy
• •Two diagnostic questions resolve most Python mutation bugs faster than a debugger

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