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The set of all global variables is known as the global environment or global state. Additionally, they permit lazy allocation and initialization, whereas global variables in many languages will always consume resources In the python 3 example that follows there is a nested function inner defined in the scope of another function outer

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Variable shadowing in computer programming, variable shadowing occurs when a variable declared within a certain scope (decision block, method, or inner class) has the same name as a variable declared in an outer scope

At the level of identifiers (names, rather than variables), this is known as name masking.

For variables, python has function scope, module scope, and global scope Python syntax and semantics a snippet of python code demonstrating binary search the syntax of the python programming language is the set of rules that defines how a python program will be written and interpreted (by both the runtime system and by human readers) The python language has many similarities to perl, c, and java. A static variable is also known as global variable, it is bound to a memory cell before execution begins and remains to the same memory cell until termination

A typical example is the static variables in c and c++. While the use of global variables is generally discouraged in modern programming, some older operating systems such as unix were originally designed for uniprocessor hardware and often use global variables to store important values An example is the errno used by many functions of the c library On a modern machine, where multiple threads may be modifying the errno variable, a call of a.