This question is not directly about Python code, but rather...
February 4, 2025 at 04:32 PM
This question is not directly about Python code, but rather about the concept of "scope" in programming—specifically in Python. The concept of scope in Python describes:
-
Where a variable is accessible (visibility):
Scope determines the part of the program where a variable can be accessed or referenced. For example:- A variable defined inside a function has a local scope and can only be accessed within that function.
- Variables declared outside of all functions, at the top level, have a global scope and can be accessed throughout the entire script unless shadowed by local variables.
-
The lifetime of a variable:
The scope also defines how long a variable exists or remains in memory:- Local variables exist only as long as the function in which they are declared is running. When the function exits, the local variables are destroyed.
- Variables with a global or module-level scope exist as long as the program is running or the module is loaded.
In Python, scope is largely determined by the LEGB rule:
- Local scope: Variables defined inside a function.
- Enclosing scope: Variables in the enclosing function(s) of a nested function.
- Global scope: Variables defined at the top level of a module.
- Built-in scope: Names pre-defined in Python's built-in namespace (e.g.,
len
,print
).
In summary, scope describes a variable's visibility and lifetime within a program.
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