Plz Explain the question

Question

def f(r):
j = range(1,r+1)
return eval("*".join([str(i)for I in j])
print(f(4))

Answer 1

First, let me explain what eval is.

eval means evaluate and it evaluates the string to be specific.

For example:

x = " 2 + 2 "
print(eval(x))
>> 4
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So in your code, you called the function with argument 4.
j = range(1, 5)
j is an iterator from 1 to 4

"*".join means it will convert the list to string with * between each element.

So, our list or iterator is like this: [1, 2, 3, 4]
Then we will convert it to string with * in between.

" 1 * 2 * 3 * 4 "
- - - - - - - - - - - - - -
Then finally, evaluate the given string using "eval" method/function.

eval ( " 1 * 2 * 3 * 4 " )
1 * 2 * 3 * 4
24

return the 24 and print the returned value

Output:
>> 24

And by the way, that function is to solve the factorial of a number using iterators instead of recursion..

If my explanation is still unclear, please feel free to ask. Thanks!

Answer 2

《 Nicko12 》 thank you so much brother..