TypeError: 'range' object does not support item assignment

TypeError: 'range' object does not support item assignment #

The Python "TypeError: 'range' object does not support item assignment" occurs when we try to change an item in a range object. To solve the error, convert the range object to a list before changing the value of the specific item.

Here is an example of how the error occurs.

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my_range = range(5)

print(my_range)  # 👉️ range(0, 5)

# ⛔️ TypeError: 'range' object does not support item assignment
my_range[0] = 9

We tried updating the first value of a range object which caused the error.

To get around this, we can use the list() class to convert the range object into a list before changing the value for the item.

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my_range = list(range(5))

print(my_range)  # 👉️ [0, 1, 2, 3, 4]

my_range[0] = 9

print(my_range)  # 👉️ [9, 1, 2, 3, 4]

Range objects do not support item assignment but lists do, so converting the range into a list helps us get around this limitation.

The range class is commonly used for looping a specific number of times in for loops and takes the following parameters:

If you only pass a single argument to the range() constructor, it is considered to be the value for the stop parameter.

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for n in range(5):
    print(n)

result = list(range(5))

# 👇️ [0, 1, 2, 3, 4]
print(result)

If values for the start and stop parameters are provided, the start value is inclusive, whereas the stop value is exclusive.

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result = list(range(1, 5))

# 👇️ [1, 2, 3, 4]
print(result)

If the value for the stop parameter is lower than the value for the start parameter, the range will be empty.

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result = list(range(1, 0))

# 👇️ []
print(result)