制表符和空格的使用不一致

Question

I'm getting the error "inconsistent use of tabs and spaces in indentation" but as far as I can tell everything is as it should be. Specifically it refers to the for item in poly(1:): and it has an up carrot below the last colon. I'm using Notepad++ editor and Python 3.4. Any thoughts?

def compute_deriv(poly):
    new_poly = ()
    for item in poly(1:):
        new_poly.append(poly.index(item)*item)
    return new_poly

print(compute_deriv(-13.89,0.0,17.5,3.0,1.0))

Answer 1

You are not creating a list at all and are slicing incorrectly:

new_poly = [] # now it's a list
for item in poly[1:]: # poly[1:] not poly(1:)

Your syntax is completely invalid, tabs and spaces are not the cause of that. You also cannot append to a tuple, you append to a list.

I would also use enumerate to get the indexes unless you only want the first index for repeated elements:

def compute_deriv(poly):
    new_poly = []
    for ind , item in enumerate(poly[1:],1):
        new_poly.append(ind*item)
    return new_poly

If you want a tuple then you should know tuples have no append and they are immutable so you would have to create a new tuple every iteration or simply use a list and return tuple(new_poly) .

You also pass no sliceable object when you call the function, instead you pass 5 args to a function that takes 1.

If you really want a tuple just use a gen exp and call tuple in it:

def compute_deriv(poly):
    return tuple(ind*item for ind, item in enumerate(poly[1:]))

Call it passing a tuple of items:

 print(compute_deriv((-13.89,0.0,17.5,3.0,1.0)))

Output:

(0.0, 17.5, 6.0, 3.0)