In Python, a namespace is a mapping between names and objects. It provides a way to keep track of all the names defined in a program and to avoid naming conflicts between different parts of the program.


        Every Python object, such as variables, functions, and classes, is stored in a namespace. Each namespace has a unique name, which is used to access the objects it contains.

        There are several types of namespaces in Python:
  • Local namespace: This namespace contains the local variables in a function. It is created when the function is called, and destroyed when the function returns.
  • Global namespace: This namespace contains the variables and functions defined at the top-level of a module or a script. It is created when the module or script is imported or executed, and lasts until the interpreter exits.
  • Built-in namespace: This namespace contains the built-in functions and exceptions that are part of the Python language. It is created when the interpreter starts, and lasts until the interpreter exits.
        When a name is referenced in a Python program, the interpreter looks for it in the local namespace first, then in the global namespace, and finally in the built-in namespace. If the name is not found in any of these namespaces, a NameError is raised.

        In summary, a namespace in Python is a mapping between names and objects, and provides a way to keep track of all the names defined in a program and to avoid naming conflicts. There are different types of namespaces in Python, such as local, global, and built-in namespaces, which are searched in a specific order when a name is referenced in a program.