What's wrong with this code ? or why Python says: "variable is not used" ?

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I'm studying the basics of Python watching the 4,5 hours YouTube video from freeCodeCamp.
I reached the for-loops, and after seeing one of examples of how we can use them I wanted to write a code doing the same thing but not using the for-loop (I often do such things, that helps me understand the material I'm covering better). I tried to write a code, and according to everything I know about Pyhton (not much), this must work. But as the result I get that neither "i" nor "result1" is used and the output is "None".

What I have tried:

Python

<pre>
def raise_to_power_1(base1, power1):
    i = 0
    result1 = 1
    if i < power1:
        result1 = result1 * base1
        i = i + 1
    else:
        return result1

Posted 12-Feb-20 22:20pm

Rodion Mikhailov

Updated 12-Feb-20 23:39pm

v2

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3 solutions

Solution 2

Your algorithm needs an iteration your implementation doesn't provide. Try

Python

def raise_to_power_1(base1, power1):
  i = 0
  result1 = 1
  while True:
    if i < power1:
      result1 = result1 * base1
      i = i + 1
    else:
      return result1

print(raise_to_power_1(5,2))

Or even (since: "To iterate is human, to recurse, divine")

Python

def raise_to_power_1(base1, power1):
  if ( power1 == 0):
    return 1
  return base1 * raise_to_power_1(base1, power1-1)

print(raise_to_power_1(5,2))

Posted 12-Feb-20 23:03pm

CPallini

Updated 12-Feb-20 23:08pm

v3

Solution 3

Don't wast your time on Youtube, Python.org provides a full tutorial at The Python Tutorial — Python 3.7.6 documentation[^].

Posted 12-Feb-20 23:40pm

Richard MacCutchan

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OriginalGriff · Accepted Answer · 2020-02-12T22:55:00

for is a loop: it repeats the code inside the loop body until the condition is no longer true.
Your code doesn't - it performs it once, and then either returns 1 or just spontaneously ends without any return value.

I think you need to either study your videos rather better (and most YouTube development tutorial videos are total garbage) or try learning from a better source - a book or course perhaps - which explains what a loop is rather than assuming you can replace it without any such structure!

What's wrong with this code ? or why Python says: "variable is not used" ?

3 solutions

Solution 1

Solution 2

Solution 3

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