Typeerror: ‘map’ object is not subscriptable

A developer can’t avoid encountering errors like typeerror: ‘map’ object is not subscriptable when working on a Python project.

As with other programming languages, it is inevitable to encounter errors.

In this article, we will talk about the error mentioned above.

Through this, you will learn a lot about the error, and by the end of this article, you will surely be able to fix it quickly.

Now, let us start by understanding the mentioned error.

What is typeerror: ‘map’ object is not subscriptable?

The typeerror: ‘map’ object is not subscriptable, as mentioned above, is an error message in Python.

This error is usually encountered by developers working on a Python project.

Why does this error occur?

Using square brackets when attempting to access or index an element in a map object triggers this error.

What is a map object?

A map object is a built-in Python iterable.

This object performs a function on each element and then returns an iterator over the results.

Back to the issue, here is a sample code that triggers this error to occur:

sl = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
s_map = map(lambda a: a*2, sl)
print(s_map[0])

In the example code above, we made an integer list.

The map() method was then used to apply the lambda function to each element of the list.

The error then happened since we used square brackets to access the first element of the map.

Error:

Traceback (most recent call last):
  File "C:\Users\path\PyProjects\sProject\main.py", line 3, in <module>
    print(s_map[0])
          ~~~~~^^^
TypeError: 'map' object is not subscriptable

Typeerror: ‘map’ object is not subscriptable – SOLUTION

The following are the solutions you can use to solve the typeerror: ‘map’ object is not subscriptable.

✅ Iterate over the map object using a for loop.

Example code:

s_map = map(lambda a: a*2, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
for e in s_map:
    print(e)

Output:

2
4
6
8
10
12
14
16
18
20

✅ Using the list() function, convert the map object into a list.

Do this if you have to access specific elements in the map object.

Example code:

s_map = map(lambda a: a*2, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
s_list = list(s_map)
print(s_list[0])

Output:

2

See also: Typeerror: ‘axessubplot’ object is not subscriptable [FIXED]

Tips to avoid getting Typeerrors

The following are some tips to avoid getting type errors in Python.

• Avoid using the built-in data types in Python in the wrong way.
  
  → Be sure that your variables and data structures are using the correct data types.

• Always check or confirm the types of your variables.
  
  → To check the types of your variables, use the type() function.
  
  This will allow you to confirm if the type of your variable is appropriate.

• Be clear and concise when writing code.
  
  → Being clear and concise when writing your code can help you avoid type errors.
  
  It is because it will become easier to understand.

• Handle the error by using try-except blocks.
  
  → Try using the try-except blocks to catch and handle any type error.

• Use the built-in functions of Python if needed.
  
  → Use built-in functions such as int(), str(), etc. if you need to convert a variable to a different type.

FAQs

Conclusion

In conclusion, the typeerror: ‘map’ object is not subscriptable occurs when you use square brackets to access an element in a map object.

You can easily fix this error by either iterating over the map object or converting it into a list.

By following the guide above, you will surely solve this error quickly.

That is all for this tutorial, IT source coders!

We hope you have learned a lot from this. Have fun coding.

Thank you for reading! 😊

Elijah Galero

Programmer & Technical Writer at PIES IT Solution

Elijah Galero is a programmer and writer at PIES IT Solution, author of 175+ tutorials at itsourcecode.com. Specializes in Python error debugging (AttributeError, TypeError, ModuleNotFoundError), Python programming tutorials, and Microsoft Excel how-to guides for BSIT students and productivity learners.

Expertise: Python · Python Errors · Python AttributeError · Python TypeError · ModuleNotFoundError · MS Excel · MS PowerPoint  · View all posts by Elijah Galero →