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9-functions.py
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9-functions.py
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# Tutorial: www.learnpython.org/en/Functions
# What are Functions?
# Functions are a convenient way to divide your code into useful blocks, allowing us to order our code, make it more readable, reuse it and save some time. Also functions are a key way to define interfaces so programmers can share their code.
# How do you write functions in Python?
# As we have seen on previous tutorials, Python makes use of blocks.
# A block is a area of code of written in the format of:
# block_head:
# 1st block line
# 2nd block line
# ...
# Where a block line is more Python code (even another block), and the block head is of the following format: block_keyword block_name(argument1,argument2, ...) Block keywords you already know are "if", "for", and "while".
# Functions in python are defined using the block keyword "def", followed with the function's name as the block's name. For example:
def my_function():
print("Hello From My Function!")
my_function()
# Functions may also receive arguments (variables passed from the caller to the function). For example:
def my_function_with_args(username, greeting):
print("Hello, %s , From My Function!, I wish you %s"%(username, greeting))
# Functions may return a value to the caller, using the keyword - 'return'. For example:
def sum_two_numbers(a, b):
return a + b
# How do you call functions in Python?
# Simply write the function's name followed by (), placing any required arguments within the brackets. For example, lets call the functions written above (in the previous example):
# Define our 3 functions
def my_function():
print("Hello From My Function!")
def my_function_with_args(username, greeting):
print("Hello, %s , From My Function!, I wish you %s"%(username, greeting))
def sum_two_numbers(a, b):
return a + b
# print(a simple greeting)
my_function()
#prints - "Hello, John Doe, From My Function!, I wish you a great year!"
my_function_with_args("John Doe", "a great year!")
# after this line x will hold the value 3!
x = sum_two_numbers(1,2)
# Exercise
# In this exercise you'll use an existing function, and while adding your own to create a fully functional program.
# Add a function named list_benefits() that returns the following list of strings: "More organized code", "More readable code", "Easier code reuse", "Allowing programmers to share and connect code together"
# Add a function named build_sentence(info) which receives a single argument containing a string and returns a sentence starting with the given string and ending with the string " is a benefit of functions!"
# Run and see all the functions work together!
# Modify this function to return a list of strings as defined above
def list_benefits():
return "More organized code", "More readable code", "Easier code reuse", "Allowing programmers to share and connect code together"
# Modify this function to concatenate to each benefit - " is a benefit of functions!"
def build_sentence(benefit):
return "%s is a benefit of functions!" % benefit
def name_the_benefits_of_functions():
list_of_benefits = list_benefits()
for benefit in list_of_benefits:
print(build_sentence(benefit))
name_the_benefits_of_functions()