CODEWITHSUNDEEP
pythonoop
Nunes
Nunes

Reputation: 61

Instantiating multiple objects in python

I'm trying to instantiate multiple objects related to the simple class defined below:

class lancamento():

    def __init__ (self,date,description,value):

    self.date=date
    self.description=description
    self.value=value

I'd like to use a for loop, which reads a csv file and sets a value to each of the class properties:

a=lancamento(input_a,input_b,input_c)

I printed the following in order to check the result:

print(a.description)

and, of course, the printed result is the one set in the last loop for iteration...

I'd like to instantiate different objects inside this for loop...

Upvotes: 1

Views: 843

Answers (2)

Meshi
Meshi

Reputation: 502

Instantiating via a loop as you suggested is correct. Below is a list comprehension that will do this for you and then 'a' will be the container for your instances

results = # "SELECT date, description, value FROM DB ..."
a = [lancamento(r[0], r[1], r[2]) for r in results]

for x in a:
    print(x.description)

Upvotes: 1

alan.elkin
alan.elkin

Reputation: 972

You didn't show your for loop code, but I'm guessing you are overwritting the name of your instance at every iteration. You could e.g. create an empty list just before the loop and append the recently created object to that list.

Upvotes: 1

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