On 2017-02-07 07:34, Rafael Skovron wrote:
I'm trying to learn how to use Classes but I keep getting NameErrors
no
matter what code I put into the script.
Any ideas why?
Assuming the code you've edited using vim is in a file mymodule.py
And after invoking the interpreter you issue the following:
import mymodule.py
your instantiation statement needs to be
rafael = mymodule.Customer('rafael', 100.0)
Alternatively you can use the following import statement (not generally
recommended:)
from mymodule import Customer
My general workflow is I edit in vim, then invoke python3 interpreter,
import the module and try to use the Class and methods from the class.
For example, importing customer.py and assigning this object yields:
rafael = Customer('rafael',100.0)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'Customer' is not defined
class Customer(object):
"""A customer of ABC Bank with a checking account. Customers have
the following properties:
Attributes: name: A string representing the customer's
name. balance: A float tracking the current balance of the
customer's account. """
def __init__(self, name, balance=0.0):
"""Return a Customer object whose name is *name* and starting
balance is *balance*."""
self.name = name
self.balance = balance
def withdraw(self, amount):
"""Return the balance remaining after withdrawing *amount*
dollars."""
if amount > self.balance:
raise RuntimeError('Amount greater than available
balance.')
self.balance -= amount
return self.balance
def deposit(self, amount):
"""Return the balance remaining after depositing *amount*
dollars."""
self.balance += amount
return self.balance
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