CODEWITHSUNDEEP
python
3qu1n0x
3qu1n0x

Reputation: 1

What is the right way to import modules inside my class

I am new to python and I'm trying to add math module inside my class but I don't know what is the right way adding it

import math
class myClass():
    #some code

or

class myClass():
    import math
    #some code

What is the right way the first or the second one?

Upvotes: 0

Views: 284

Answers (1)

blhsing
blhsing

Reputation: 106455

Anything declared inside a class definition becomes a class variable, a module included, so by importing math within a class definition, it becomes a class variable that is accessible only via the class object or the instance object, so:

class myClass:
    import math

    def __init__(self, value):
        self.value = value

    def sqrt(self):
        return math.sqrt(self.value)

print(myClass(4).sqrt())

would result in:

NameError: name 'math' is not defined

but changing the sqrt method to:

def sqrt(self):
    return self.math.sqrt(self.value)

would properly output:

2.0

That said, there is usually no good reasons to import modules as class variables. In the vast majority of cases modules are imported outside the class, as global variables.

Upvotes: 3

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