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→PART 3 - Iterating Over Lists
</source>The final '''return "ok"''' will only take place if a previous return has not taken place before it. Once return has been used in a function, the function immediately exits and returns the value.
:#Call describe_temperature like this to confirm the results:<source>
print(describe_temperature(50))
# Will return 'hot'
print(describe_temperature(20))
# Will return 'perfect'
print(describe_temperature(-50))
# Will return 'cold'
print(describe_temperature(25))
# Will return 'ok'
print(describe_temperature(10))
# Will return 'ok'
</source>
:#Create a new python file for testing.
:#Import the '''''os''''' module in your python file.
:#You can issue operating system commands by using the '''system()''' function. Try it:<source lang="python">
os.system('ls')
print(list_of_numbers)
print(new_list_of_numbers)
</source>The above is just one example of a quick use of for loops mixed with lists. But be careful when passing lists into functions. When you give a function a list as an argument, it is the actual list reference and NOT a copy. This means a function can change the list without making a new list. While you do have to be careful , this can also be useful, a . A function can modify any given list, ''without '' have to return it.<br><br>
:#To demonstrate, run the following code:<source lang="python">
list_of_numbers = [ 1, 5, 2, 6, 8, 5, 10, 2 ]