Python help to print an object to a string

Question

so I have a project that is pretty straight forward. It's a simple BMI calculator and should just simply print,

"The BMI for (name) is (BMI), (status, like if they're underweight, overweight etc.)

name = str(input("What is your name? "))
age = int(input("What is your age? "))
weight_float = float(input("What is your weight in pounds? "))
height_float = float(input("What is your height in inches? "))

Pounds2Kilogram = weight_float * 0.453592
Inches2Meter = height_float * 0.0254

weight = Pounds2Kilogram
height = Inches2Meter


class calcBMI:

    def __init__(self, name, age, weight, height):
        self.__name = name
        self.__age = age
        self.__weight = weight
        self.__height = height

    def getBMI(self):
        return self.__weight / (self.__height **2)

    def getStatus(self):
        if BMI < 18.5:
            self.__getStatus = "Underweight"
        elif 18.5 < BMI < 24.9:
            self.__getStatus = "Normal"
        elif 25.0 < BMI < 29.9:
            self.__getStatus = "Overweight"
        elif BMI > 30:
            self.__getStatus = "Obese"

    def getName(self):
        return self.__name

    def getAge(self):
        return self.__age

    def getWeight(self):
        return self.__weight

    def getHeight(self):
        return self.__height

    def __str__(self):
        return "The BMI for", + self.__name(), + "is", + self.__getBMI()

    def PrintBMI(self):
        print(self.__str__())

a = caclBMI     
print(a)

I keep getting:

 <class '__main__.calcBMI'>

I know that means I need to convert the object to a string and I'm sure I'm missing something simple.

Thanks for helping if you do so choose to.

The call to __getBMI() in __str__() probably doesn't work since it's not defined. — theorifice
– theorifice, Commented Dec 4, 2016 at 3:06
It looks like you're not actually instantiating the object. You need to instantiate an instance of CalcBMI — theorifice
– theorifice, Commented Dec 4, 2016 at 3:07
Also note that __str__ method as defined above returns a 4-tuple (if anything) instead of a string. — hilberts_drinking_problem
– hilberts_drinking_problem, Commented Dec 4, 2016 at 3:08
__str__ has problem in syntax, OP used both comma and plus sign which doesn't make sense! — Wasi Ahmad
– Wasi Ahmad, Commented Dec 4, 2016 at 3:21

Ignacio Vazquez-Abrams · Accepted Answer · 2016-12-04 03:07:32Z

1

a = caclBMI

You've rebound a to the class. You need to instantiate the class instead.

answered Dec 4, 2016 at 3:07

Ignacio Vazquez-Abrams

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Comments

theorifice · Accepted Answer · 2016-12-04 03:08:56Z

0

It looks like you're not actually instantiating the object. You need to instantiate an instance of CalcBMI

...

my_calc_bmi = CalcBMI(my_name, my_age, ...)
print "String representation is: ", my_calc_bmi
print "Or converting explicitly: %s" % (str(my_calc_bmi))

answered Dec 4, 2016 at 3:08

theorifice

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Comments

Stephane Martin · Accepted Answer · 2016-12-04 03:10:30Z

0

Just implement __str__ and __repr__ methods.

https://docs.python.org/3/reference/datamodel.html#object.str

https://docs.python.org/3/reference/datamodel.html#object.repr

class calcBMI:
    def __str__(self):
        return "The BMI for {} is {}".format(self.__name, self.getBMI())

    def __repr__(self):
        return 'calcBMI({}, {}, {), {})'.format(self.__name, self.__age, self.__height, self.__weight)

...

a = calcBMI("Zogzog", 123, 210, 176)
print(a)

edited Dec 4, 2016 at 3:10

answered Dec 4, 2016 at 3:06

Stephane Martin

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1 Comment

theorifice Over a year ago

It looks like OP has implemented __str__()

Wasi Ahmad · Accepted Answer · 2016-12-04 03:15:56Z

0

You have problem in the following method:

def __str__(self):
        return "The BMI for " + self.__name + " is " + str(self.getBMI())

Since self.getBMI() is returning float value, you need to convert it to string.

Moreover, you need to instantiate the class instead as follows:

a = caclBMI(name, age, weight, height)

For example:

a = calcBMI('Alex', 25, 100, 60)
print(a)

It outputs:

The BMI for Alex is 0.027777777777777776

edited Dec 4, 2016 at 3:15

answered Dec 4, 2016 at 3:09

Wasi Ahmad

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6 Comments

The Illusion Over a year ago

now I'm getting TypeError: 'str' object is not callable,

The Illusion Over a year ago

I have a = calcBMI(name, age, weight, height)

Wasi Ahmad Over a year ago

make sure you are using - self.__name and str(self.getBMI()). if not, please update your code and we will be able to check.

The Illusion Over a year ago

return "The BMI for", self.__name, "is", str(self.__getBMI())

The Illusion Over a year ago

I get the error, AttributeError: 'calcBMI' object has no attribute 'calcBMI_getBMI'

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