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The second component of a function is its code block, or body. To write a Python function, you need a header that starts with the def keyword, followed by the name of the function, an optional list of comma-separated arguments inside a required pair of parentheses, and a final colon. You’ll cover the difference between explicit and implicit return values later in this tutorial. All Python functions have a return value, either explicit or implicit.

The value that a function returns to the caller is generally known as the function’s return value. In general, a function takes arguments (if any), performs some operations, and returns a value (or object). ( Source)Įven though the official documentation states that a function “returns some value to the caller,” you’ll soon see that functions can return any Python object to the caller code. It can also be passed zero or more arguments which may be used in the execution of the body.

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The Python documentation defines a function as follows:Ī series of statements which returns some value to a caller. In Python, these kinds of named code blocks are known as functions because they always send a value back to the caller. Both procedures and functions can act upon a set of input values, commonly known as arguments. On the other hand, a function is a named code block that performs some actions with the purpose of computing a final value or result, which is then sent back to the caller code. In general, a procedure is a named code block that performs a set of actions without computing a final value or result. For example the Visual Basic programming language uses Sub and Function to differentiate between the two. Sometimes that difference is so strong that you need to use a specific keyword to define a procedure or subroutine and another keyword to define a function. In some languages, there’s a clear difference between a routine or procedure and a function. Programmers call these named code blocks subroutines, routines, procedures, or functions depending on the language they use. These named code blocks can be reused quickly because you can use their name to call them from different places in your code. Most programming languages allow you to assign a name to a code block that performs a concrete computation. If you’re totally new to Python functions, then you can check out Defining Your Own Python Function before diving into this tutorial.įree Bonus: 5 Thoughts On Python Mastery, a free course for Python developers that shows you the roadmap and the mindset you’ll need to take your Python skills to the next level. With this knowledge, you’ll be able to write more readable, maintainable, and concise functions in Python.
#Python shortcat for returning greater item how to#
