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  1. Function is a block of code written to carry out a specified task. Functions provide better modularity and a high degree of code reusing. I. Built-in functions The Python interpreter has a number of functions built into it that are always available. They are listed here in alphabetical order. II.

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  2. When a function is called programmers commonly say that the “control” of the program has been transferred to the function. The function is responsible for the program’s execution. Functions must be defined before they can be used. In Python we generally place all of our functions at the beginning of our programs. print (“Hello there!”)

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  3. Function Definition def fct(x,y,z): """documentation""" # statements block, res computation, etc. return res function name (identifier) result value of the call, if no computed result to return: return None ☝ parameters and all variables of this block exist only in the block and during the function call (think of a “black box”) named ...

  4. Find the function definition, function name, parameter(s), and return value. What is the “calling” function? What’s the difference between arguments and parameters? arguments are the values passed in when function is called! def main(): mid = average(10.6, 7.2) print(mid) Note that we’re storing the returned value in a variable!

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  5. One of the building blocks of programming is associating a name to a value. This is called assignment. The associated name is usually called a variable. In this example x is a variable and it’s value is 4. If you try to use a name that is not associated with any value, python gives an error message. File "<stdin>", line 1, in ?

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  6. • Functions are full-fledged objects in Python • This means you can pass functions as parameters • Example: Calculate the average of the values of a function

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  8. WhatPythonistasSayAboutPython Basics: A Practical In- troductiontoPython3 “I love [the book]! The wording is casual, easy to understand, and makestheinformation @owwell. Ineverfeellostinthematerial,

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