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:dfn:`Call`

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Python expressions can call a function which returns a value. They begin with an expression (usually a variable), followed by a left-parenthesis, a comma-separated list of arguments, and a right-parenthesis. The argument list begins with the position arguments, which are python expressions. These are followed by keyword arguments, which consist of the argument name, and equals sign, and an expression. In the example example::

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we call the Character function. It's given one positional argument, the string "Eileen". It's given two keyword argument: ``type`` with the value of the ``adv`` variable, and ``color`` with a string value of "#0f0".

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Constructors are a type of function which returns a new object, and are called the same way.

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When reading this documentation, you might see a function signature like:

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A sample function that doesn't actually exist in Ren'Py, but is used only in documentation.

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This function:

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Has the name "Sample"

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Has two positional parameters, a name and a delay. In a real function, the types of these parameters would be made clear from the documentation.

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Has one keyword argument, position, which has a default value of (0, 0).