Python can't define tuples in a function

function, python, python-3.x, tuples

Solution

Tuple parameters are no longer supported in Python3: http://www.python.org/dev/peps/pep-3113/

You may unpack your tuple at the beginning of your function:

def add_vectors(v1, v2):
    angle_1, l_1 = v1
    angle_2, l_2 = v2
    x=math.sin(angle1)*l_1+math.sin(angle2)*l_2
    y=math.cos(angle1)*l_1+math.cos(angle2)*l_2

    angle=0.5*math.pi-math.atan2(y, x)
    length=math.hypot(x, y)
    return (angle, length)

Problem

For some reason in python everytime I try to define tuples in a function I get a syntax error. For example I have a function that adds vectors to the program, it looks like this: ``` def add_vectors((angle_1, l_1),(angle_2, l_2)): x=math.sin(angle1)*l_1+math.sin(angle2)*l_2 y=math.cos(angle1)*l_1+math.cos(angle2)*l_2 angle=0.5*math.pi-math.atan2(y, x) length=math.hypot(x, y) return (angle, length) ``` Which seems alright, but the interpretor says there is a syntax error and highlights the first bracket of the first tuple. I am using Python 3.2.3. What am I doing wrong?

Original source

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