Doubt: Function of generators

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Write your own generator function which works as the internal enumerate function. Using the function thus:

lessons = ["Why Python Programming", "Data Types and Operators", "Control Flow", "Functions", "Scripting"]

for i, lesson in my_enumerate(lessons, 1):
    print("Lesson {}: {}".format(i, lesson))

should result in the exit:

Lesson 1: Why Python Programming
Lesson 2: Data Types and Operators
Lesson 3: Control Flow
Lesson 4: Functions
Lesson 5: Scripting

" So guys, I’m having a really hard time on this subject(Generators), I can’t understand how I can solve this problem , I believe I should use the function enumerate() , but my lack of understanding of the subject is compromising my attempts. "

lessons = ["Why Python Programming", "Data Types and Operators", "Control Flow", "Functions", "Scripting"]

def my_enumerate(iterable, start=0):
    # Implement your generator function here


for i, lesson in my_enumerate(lessons, 1):
    print("Lesson {}: {}".format(i, lesson))
python function

  • You can include which error is preventing you from succeeding with the code?

  • @Williamlio actually I’m not even able to think how I should create this code , I repeat , because I don’t understand the subject related to generators .

  • When I first read it, I understood something very different, when I reread it. I found it very interesting. I’ll keep an eye out, I also want to know the answer ;)

  • @Barbetta , me too, I’m not in any way able to find or come up with a code to solve this.

1 answer

5


You don’t need to know the background of generators to make a replica of enumerate, because this is simple. Its implementation would be something like:

def my_enumerate(iterable, start=0):
    current = start  # começa no numero passado como segundo parametro
    for elem in iterable: 
        yield current, elem  # gera uma nova tupla
        current += 1  # aumenta o numero corrente

The yield is responsible for generating each tuple with the position and element of the eternal.

See the example working on Ideone

This is a topic that you should follow with some calm and preferably when you have mastered the basics of Python, as it is more complicated, and still has many details.

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