IF statement Python

Question

I have this code:

def Gradiente(grado):
   suma = 0
   for i in range(porcent):
       x1 = entrenamiento[i][0]
       x2 = entrenamiento[i][1]
       y = entrenamiento[i][2]
       h = 1 / (1 + math.exp(-(t0 + t1 * x1 + x2))

       if (grado == 1):
           suma = suma + (h - y)
       elif(grado == 2):
           suma = suma + (h - y) * x1 

   return suma / porcent

at the if, it keeps saying invalid syntax (at the ":"), is it wrong?

Missing closing ) for this expression: (1 + math.exp(-(t0 + t1 * x1 + x2)) — Ashwini Chaudhary
– Ashwini Chaudhary, Commented Nov 13, 2013 at 6:24
i know about identation is just when i paste the code, the correct answer is the missin ")" thanks all — Menticolcito
– Menticolcito, Commented Nov 13, 2013 at 6:31

paxdiablo · Accepted Answer · 2013-11-13 06:41:44Z

97.2% of all problems people have with Python involves incorrect indentation :-) In your original question, your indentation was incorrect and you need to indent it properly:

def Gradiente(grado):
    suma = 0
    for i in range(porcent):
        x1 = entrenamiento[i][0]
        x2 = entrenamiento[i][1]
        y = entrenamiento[i][2]
        h = 1 / (1 + math.exp(-(t0 + t1 * x1 + x2)))  # <-- fix

        if grado == 1:                                # <-- style
            suma = suma + (h - y)
        elif grado == 2:                              # <-- style
            suma = suma + (h - y) * x1 

    return suma / porcent

However, you've since made it clear that was a typo on your part when entering the question in which case it'll simply be the missing close-parenthesis on that large mathematical formula (which is also fixed in my code above).

One other change made is the removal of superfluous punctuation from the if statements. People who use them tend to come from a C (or similar language) background where they're necessary. Using them in Python usually just clutters the code unnecessarily.

bob · Accepted Answer · 2013-11-13 06:24:38Z

1

Indent everything one tab after line 1. Indentation matters in Python.

answered Nov 13, 2013 at 6:24

bob

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