Iterators and Generators Homework

Create a generator that generates the squares of numbers up to some number N.



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def gensquares(N):
    for num in xrange(1,N):
        yield num**2



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for x in gensquares(10):
    print x

Create a generator that yields "n" random numbers between a low and high number (that are inputs). Note: Use the random library. For example:



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import random

random.randint(1,10)









    Out[6]:





1



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def rand_num(low,high,n):
    for num in xrange(n):
        yield random.randint(low,high)



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for num in rand_num(1,10,12):
    print num

Use the iter() function to convert the string below



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s = 'hello'
s_iter = iter(s)

next(s_iter)
next(s_iter)

#code here









    Out[12]:





'e'

Explain a use case for a generator using a yield statement where you would not want to use a normal function with a return statement.

loop over a large matrix or data frame

Can you explain what gencomp is in the code below? (Note: We never covered this in lecture! You will have to do some googling/Stack Overflowing!)



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my_list = [1,2,3,4,5]

gencomp = (item for item in my_list if item > 3)

for item in gencomp:
    print item

4
5

Hint google: generator comprehension is!

Great Job!



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