Myujth

I have started learning Python. I have created a class which has a function and in that function i have a dictionary . No i am checking whether a key exists in the dictionary or not , after checking i am returning a value from the function .

Now i cam trying to access the function but when when i am doing so i am getting an error "TypeError: first_func() takes 0 positional arguments but 1 was given"

Below is the code which i am using :

class myFirst:
 def first_func():
 flag=0
 phonebook = 
 "A" : 938477566,
 "B" : 938377264,
 "C" : 947662781
 
 # testing code
 if "A" in phonebook:
 flag=1
 if "D" not in phonebook:
 flag = 0
 return flag

myclassObj = myFirst()
status = myclassObj.first_func()

if status > 1:
 print ("Pass")
else:
 print ("fail")

methods (functions or procedures belonging to a class) require a self argument (you may be familiar with this from other languages) like so:

class myFirst:
 def first_func(self): # here
 flag=0
 phonebook = 
 "A" : 938477566,
 "B" : 938377264,
 "C" : 947662781
 
 # testing code
 if "A" in phonebook:
 flag=1
 if "D" not in phonebook:
 flag = 0
 return flag

myclassObj = myFirst()
status = myclassObj.first_func()

if status > 1:
 print ("Pass")
else:
 print ("fail")

it should work with that minor change

The error is you're not referencing self in your function signature. Change the signature to

def first_func(self):
 # rest of code

In addition to adding the self argument, you could consider shortening your code as well. Your function returns a boolean value which you assigned to status, and then you compared status to an int. Instead, you can do something like this to save a few lines-

myClassObj = myFirst()
if myClassObj.first_func():
 print "Pass"
else
 print "Fail"

The complexity gain is quite minimal, but there's no reason to assign the boolean value to another variable when you can just use the value that's returned by your function.