python class error: missing 1 required positional argument: 'self'

Question

Hey guys,

I'm doing a personal project to understand classes better and I can't get past this error:
TypeError: number_of_crew_members() missing 1 required positional argument: 'self'.
I'm running the method using "prometheus.number_of_crew_members()"

Does anyone know how I can fix this?
Appreciate any help!
Thanks

class prometheus:

num_of_crew_members = 0

def __init__(self, first, last, job_title, security_code=None):
self.first = first
self.last = last
self.job_title = job_title
self.security_code = security_code

#number of crew members
prometheus.num_of_crew_members += 1

# Fullname
def fullname(self):
return '{} {}'.format(self.first, self.last)

# Crew members profile
def crew_member_profile(self):
return 'Name: {}, {} ---> Tile: {} ---> Security Code: {}'.format(self.last, self.first, self.job_title, self.security_code)

def number_of_crew_members(self):
return "Number of crew members: {}".format(prometheus.num_of_crew_members)

Answer 1

thanks NotAPythonNinja. i will. i forgot you could do this.

Answer 2

NotAPythonNinja thanks so much for your help. its works.

Answer 3

NotAPythonNinja thanks for answering.
do you mean something like this:
crew = prometheus.number_of_crew_members()
then call “crew”?