You have given a Python list. Write a program to find value 20 in the list, and if it is present, replace it with 200. Only update the first occurrence of an item.

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YasminRadwan26

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2022-05-04

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Replace list’s item with new value if found

You have given a Python list. Write a program to find value 20 in the list, and if it is present, replace it with 200. Only update the first occurrence of an item.

Given:

list1 = [5, 10, 15, 20, 25, 50, 20]

Expected output:

[5, 10, 15, 200, 25, 50, 20]

Python programming,

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YasminRadwan26

2022-05-04

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Hint:

Use list method index(20) to get the index number of a 20
Next, update the item present at the location using the index number

Solution:

list1 = [5, 10, 15, 20, 25, 50, 20]

# get the first occurrence index
index = list1.index(20)

# update item present at location
list1[index] = 200
print(list1)

Explanation in video: