I Received an Error Message That I Don't Quite Understand

function addition(x,y, callback){
  var result =x+y;
  var error = isNaN(result) ? 'Bad input!' : undefined;
  callback(result, error);
}

addition(1, 2, function(res, err) {
  console.log(res);
  if(err) {
    console.log(err);
  }
});

addition('apple', 2, function(res, err) {
  console.log(res);
  if(err) {
    console.log(err);
  }
});

Error message: "'chromedriver' executable needs to be available in the path"

You can test if it actually is in the PATH, if you open a cmd and type in chromedriver (assuming your chromedriver executable is still named like this) and hit Enter. If Starting ChromeDriver 2.15.322448 is appearing, the PATH is set appropriately and there is something else going wrong.

Alternatively you can use a direct path to the chromedriver like this:

 driver = webdriver.Chrome('/path/to/chromedriver') 

So in your specific case:

 driver = webdriver.Chrome("C:/Users/michael/Downloads/chromedriver_win32/chromedriver.exe")

Struggling to Understand Error Message

According to this documentation the parameters to trapz(y, x, dx, axis) are:

• y - Array like - input array to integrate.
• x - Optional array - If x is None, then spacing between all y elements is dx.
• dx - Optional scalar - If x is None, spacing given by dx is assumed. Default is 1.
• axis - Optional Int - specify the axis.

So you shouldn't specify both x and dx - one of them should be None.

Perhaps this is what you want: trapz(Bwavelength, None, h).

See this answer for more details on the error message and NumPy's "braodcasting rule".

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