Noom’s source

noom is python library that defines Noom datatype - an alternative to number type but with limited capabilities. This is developed as part of a learning exercise in literate programmimg - using nbdev and fastcore. The goal here is to create a noom class whose objects are compatible with common arithmetic (+, -, x, /, //) and comparison(=, < , >, <=, >=) operators.

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Noom

 Noom (val)

Noom is a number datatype alternative with limited capabilities.

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Noom.add

 Noom.__add__ (oth)

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Noom.sub

 Noom.__sub__ (oth)

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Noom.mul

 Noom.__mul__ (oth)

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Noom.truediv

 Noom.__truediv__ (oth)

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Noom.floordiv

 Noom.__floordiv__ (oth)

Now, we have defined the arithmetic operations for noom objects using Python’s magic methods. Let’s take a look at few examples:

a = Noom(5)
b = Noom(6)

a + b

a - b

-1

a * b

a / b

0.8333333333333334

b // a

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Noom.eq

 Noom.__eq__ (oth)

Return self==value.

Let’s define a few nooms and look at examples…

p = Noom(5)
q = Noom(5)
r = Noom(6)

Here are a couple of example to check equality of noom objects:

p == q, p != q

(True, False)

p == r, p != r

(False, True)

Equality check can be done for Noom objects only after __eq__ is defined. So now, we can add tests for the arithmetic operators as weel.

test_eq(a + b, Noom(11))

We need not define __ne__ , it is auto inferred by python once __eq__ is defined. This is valid for other comparison operators too.

test_ne(a + b, Noom(12))

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Noom.lt

 Noom.__lt__ (oth)

Return self<value.

Examples:

p < q, p > q

(False, False)

p < r, p > r

(True, False)

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Noom.le

 Noom.__le__ (oth)

Return self<=value.

Examples:

p <= q, p >= q

(True, True)

p <= r, p >= r

(True, False)