--description--

For the second day of Space Week, you are given a string where each character represents the luminosity reading of a star. Determine if the readings have detected an exoplanet using the transit method. The transit method is when a planet passes in front of a star, reducing its observed luminosity.

• Luminosity readings only comprise of characters 0-9 and A-Z where each reading corresponds to the following numerical values:
• Characters 0-9 correspond to luminosity levels 0-9.
• Characters A-Z correspond to luminosity levels 10-35.

A star is considered to have an exoplanet if any single reading is less than or equal to 80% of the average of all readings. For example, if the average luminosity of a star is 10, it would be considered to have a exoplanet if any single reading is 8 or less.

--hints--

has_exoplanet("665544554") should return False.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(has_exoplanet("665544554"), False)`)
}})

has_exoplanet("FGFFCFFGG") should return True.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(has_exoplanet("FGFFCFFGG"), True)`)
}})

has_exoplanet("MONOPLONOMONPLNOMPNOMP") should return False.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(has_exoplanet("MONOPLONOMONPLNOMPNOMP"), False)`)
}})

has_exoplanet("FREECODECAMP") should return True.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(has_exoplanet("FREECODECAMP"), True)`)
}})

has_exoplanet("9AB98AB9BC98A") should return False.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(has_exoplanet("9AB98AB9BC98A"), False)`)
}})

has_exoplanet("ZXXWYZXYWYXZEGZXWYZXYGEE") should return True.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(has_exoplanet("ZXXWYZXYWYXZEGZXWYZXYGEE"), True)`)
}})

--seed--

--seed-contents--

def has_exoplanet(readings):

    return readings

--solutions--

def has_exoplanet(readings):
    values = [int(c, 36) for c in readings]
    average = sum(values) / len(values)
    threshold = average * 0.8
    for v in values:
        if v <= threshold:
            return True
    return False