Python Programming: Lesson 62 - Iterators and the exec Function

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In the previous lesson (https://youtu.be/spPlErG9kmg), we took a look at some more OOP fundamentals, reviewing the call and contains magic methods. We also introduced running a module as a script. We say a little more about that in this video, but then we bring up the exec function and iterators. The exec function allows you to execute Python code within a string, and iterators allow you to iterate (parse) through the elements in a particular data structure.

W = iter(D) accepts a data structure and returns an iterator
N = next(W) returns the next element in the data structure D

myTuple = 8 , 2 , "sup" , 9
b = iter(myTuple)
w,x,y,z = myTuple
c = 0
c += next(b)
c += next(b)
c += z
c = c + ( myTuple[1] // 2 )
print(c) prints 20 on the console

exec(x) accepts a string x and executes it as Python code

exec( "a=" + "10" )
exec( "b,c = a,a-1" )
exec( "print( \"a+b+c\"= + str(a+b+c))" )

prints "a+b+c"=29

7:15 NEW: exec(x) for some Python code string x executes the Python code within " "
10:40 NEW: Iterators

The Java connection to a topic on iterators is provided in this video: https://youtu.be/Qfr9kEb4IDc

More on iterators in Python can be found in a video a little further down the road: https://youtu.be/xSNK_dqXfu0

Ready for the next video, which is on matrices (2D lists of lists or tuples with numbers in them)? They will be discussed in the next video [and the video after]: https://youtu.be/y-sqYQGxUaE

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