If you are dealing with selections in Python, you might have come across the “IndexError: way too many indices for variety” mistake. This mistake happens when you attempt to access a component in a range making use of way too many indices.
In this tutorial, we will certainly review the root causes of this mistake as well as offer options to repair it. We will certainly likewise cover some finest methods to prevent this mistake in the future.
Selections in Python
Arrays are a collection of aspects of the exact same information kind. In Python, selections are frequently executed making use of the numpy component. Selections can be single-dimensional or multi-dimensional.
Single-dimensional arrays are likewise called 1-D selections. They are a collection of aspects of the exact same information kind prepared in a direct series. They can be developed making use of the numpy. variety() feature. For instance:
import numpy as np arr = np.array( [1, 2, 3, 4, 5]). print( arr)
Output:
[1 2 3 4 5]
Multi-dimensional arrays are likewise called n-D selections. They are a collection of aspects of the exact same information kind prepared in a grid-like framework. They can be developed making use of the numpy. variety() feature with embedded checklists. For instance:
import numpy as np. arr = np.array( [[1, 2, 3], [4, 5, 6], [7, 8, 9]]. print( arr)
Output:
[[1 2 3] [4 5 6] [7 8 9]]
In the above instance, we have actually developed a 2-D variety with 3 rows as well as 3 columns. We can access the aspects of a multi-dimensional variety making use of indexing. For instance:
import numpy as np. arr = np.array( [[1, 2, 3], [4, 5, 6], [7, 8, 9]]. print( arr[0, 1])
Output:
2
In the above instance, we have actually accessed the aspect at row 0 as well as column 1 of the 2-D variety.
A numpy variety can have any type of variety of measurements. To obtain the variety of measurements of a numpy variety, you can utilize the ndim characteristic. Right here’s an instance:
import numpy as np.
arr = np.array( [[1, 2, 3], [4, 5, 6], [7, 8, 9]].
print(" Variety of measurements:", arr.ndim) Output:
Variety of measurements: 2
In this instance, the numpy variety arr has 2 measurements.
Why does the IndexError: way too many indices in array take place?
The IndexError: way too many indices in array mistake happens when you attempt to access a component in a NumPy variety making use of way too many indices. This indicates that you are attempting to access a component that does not exist in the variety.
Let’s have a look at an instance to comprehend this mistake much better:
import numpy as np. # produce a 2D variety. arr = np.array( [[1, 2, 3], [4, 5, 6], [7, 8, 9]]. # obtain worth at (0, 0, 0). print( arr[0, 0, 0])
Output:
---------------------------------------------------------------------------. IndexError Traceback (newest phone call last). Cell In[8], line 6. 4 arr = np.array( [[1, 2, 3], [4, 5, 6], [7, 8, 9]]. 5 # obtain worth at (0, 0, 0). -- > 6 print( arr[0, 0, 0]). IndexError: way too many indices for variety: variety is 2-dimensional, yet 3 were indexed
In this instance, we have a 2-D variety arr. We are attempting to access the aspect at ( 0, 0, 0) of arr. Nonetheless, arr just has 2 measurements, so we can not utilize 3 indices to access a component. Hence we obtain the IndexError: way too many indices for array mistake. Notification that the mistake message likewise offers us the info that array is 2-dimensional, yet 3 were indexed.
Exactly how to Repair this mistake?
To solution this mistake, we require to make certain that the variety of indices utilized to access a component in a range amounts to or much less than the variety of measurements of the variety.
For example, in the above instance, allow’s print out the variety of measurements in the variety. You can utilize the . ndim building of the numpy variety.
import numpy as np. # produce a 2D variety. arr = np.array( [[1, 2, 3], [4, 5, 6], [7, 8, 9]]. # variety of measurements. print( arr.ndim)
Output:
2
Conversely, you can likewise utilize the size of the arr. shape to obtain the variety of measurements.
# variety of measurements. print( len( arr.shape))
Output:
2
Understanding that the variety has 2 measurements, we can just utilize an optimum of 2 indices to gain access to worths in the variety. For instance, to obtain the worth in the initial row as well as the initial column, usage (0,0).
# worth at the initial row as well as initial column. print( arr[0, 0])
Output:
1
Or, you can likewise obtain the whole initial row.
# the initial row. print( arr[0])
Output:
[1 2 3]
Conclusion
In this tutorial, we found out about the IndexError: way too many indices for array mistake in Python. We likewise saw an instance of exactly how this mistake can take place as well as exactly how to repair it. Bear in mind to constantly make certain that the variety of indices utilized to access a component in a range or listing amounts to or much less than the variety of measurements of the variety.
You may likewise have an interest in–
