TypeError: Class() takes no arguments in Python [Solved]

# TypeError: Class() takes no arguments in Python

The Python "TypeError: Class() takes no arguments" occurs when we forget to define an __init__() method in a class but provide arguments when instantiating it.

To solve the error, make sure to define the __init__() (two underscores on each side) method in the class.

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Traceback (most recent call last):
  File "/home/borislav/Desktop/bobbyhadz_python/main.py", line 62, in <module>
    emp = Employee('Bobby Hadz', 100)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Class() takes no arguments
TypeError: Object() takes no arguments

Here is an example of how the error occurs.

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class Employee():
    def get_salary(self):
        return self.salary


# ⛔️ TypeError: Employee() takes no arguments
emp = Employee('Bobby Hadz', 100)
print(emp)

We haven't defined an __init__() method but are passing arguments to the class.

When a class is instantiated, its __init__() method gets called with the supplied arguments.

# Define an __init__ method to solve the error

To solve the error, make sure to define an __init__() method or correct your spelling if your class already has one.

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class Employee():

    def __init__(self, name, salary):
        self.name = name
        self.salary = salary

    def get_salary(self):
        return self.salary


emp = Employee('Bobby Hadz', 100)

print(emp.name)  # 👉️ Bobby Hadz
print(emp.get_salary())  # 👉️ 100

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def __init__(self, name, salary): # ✅ Correct

def _init_(self, name, salary): # ⛔️ Incorrect

def __init(self, name, salary)__: # ⛔️ Incorrect

If you mistype the __init__ method in the class's definition, it won't get invoked when the class is instantiated.

When a class defines the __init__() method, the method is invoked when an instance is created.

The following line calls the __init__() method of the class.

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emp = Employee('Bobby Hadz', 100)

If you pass arguments when instantiating a class, the arguments are passed on to the __init__() method.

The __init__() method isn't supposed to return anything.

Note that the first argument the __init__() method takes is self.

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def __init__(self, name, salary):
    self.name = name
    self.salary = salary

You could name this argument anything because the name self has no special meaning in Python.

self represents an instance of the class, so when we assign a variable as self.my_var = 'some value', we are declaring an instance variable - a variable unique to each instance.

When defining the __init__ method, make sure you have indented the code block consistently.

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class Employee():


def __init__(self, name, salary): # ⛔️ Forgot to indent the method
    self.name = name
    self.salary = salary

If the method isn't indented correctly, you will either get an error or the method won't run when you instantiate the class.

Note that unlike other methods, the __init__ method isn't supposed to return anything.

The method is used to assign properties to the newly created class instance.

If you use a return statement in your __init__ method, you'd get an error: TypeError: __init__() should return None, not 'X'.

# Additional Resources

You can learn more about the related topics by checking out the following tutorials:

• Call a class method from another Class in Python
• Purpose of 'return self' from a class method in Python
• Convert a string to a Class object in Python
• Creating class instances from a Dictionary in Python
• How to Create an incremental ID in a Class in Python
• How to get the File path of a Class in Python
• How to Update or access Class variables in Python
• How to access Parent class Attributes in Python
• Error: filename.whl is not supported wheel on this platform