Handling TypeError exception in python

Calling a non-callable object or function

If we call a non-callable object then a TypeError exception occurs. For example, calling an integer value will give an error.

Code

value = 12
value()

Output

TypeError: 'int' object is not callable

Incorrect type of lists index

The list indices should be integer only. If we access them with a character, string, float, etc. then we will get the TypeError exception.

Code

values = [1, 2, 3, 4, 5]
print(values['1'])

Output

TypeError: list indices must be integers or slices, not str

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Iterating a non-iterative object

If we try to iterate a non-iterative object, then also we will get the TypeError exception. For example, iterating an integer value.

Code

values = [1, 2, 3, 4, 5]
print(values['1'])

Output

TypeError: 'int' object is not iterable

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Handling TypeErrors

We can handle the TypeError using the ‘try’ and ‘except’ blocks. We can explicitly mention it in the except block.

Code

list = ["Coding", "Ninjas", "CodingNinjas"]
indices = [0, 1, "2"]
for i in range(len(indices)):
    try:
        print(list[indices[i]])
    except TypeError:
        print("TypeError: Check list of indices")

Output

Coding
Ninjas
TypeError: Check list of indices

You can try it on online python compiler.

Check out Escape Sequence in Python

FAQs

1. What is a TypeError?
   TypeError is one of the Exceptions in Python. Whenever we make a call or access any object which does not exist or is unsupported then the TypeError exception occurs.
    
2. How do we handle TypeErrors?
   We can handle the TypeError using the ‘try’ and ‘except’ blocks. We can explicitly mention TypeError in the except block.

Conclusion 

In this article, we have extensively discussed the following things:

1. We first discussed what are TypeErrors and how they occur.
2. Then we discussed how to handle TypeErrors.

We hope that this blog has helped you enhance your knowledge regarding TypeErrors in Python language and if you would like to learn more, check out our articles here. Do upvote our blog to help other ninjas grow. Happy Coding!