TypeError: check_card_number() takes 1 positional argument but 2 were given code example

Example 1: takes 1 positional argument but 2 were given python

This error is often caused by the fact that the self is omitted as a parameter in the method of the class.

https://careerkarma.com/blog/python-takes-one-positional-argument-but-two-were-given/#:~:text=Conclusion,the%20methods%20in%20a%20class.
0

Example 2: takes 2 positional arguments but 3 were given

# just put self in other functions like this
class myclass:
  def __init__(self, parameter):
  	self.parameter = parameter
  def function(self, otherparameter):
    # put a self ^ there
    print(self.parameter + otherparameter)

object=myclass(1)
object.function(2)
# output is 3