a = "240" print(a.zfill(4))

 Code :

a = "240"

print(a.zfill(4))

Solution and Explanation : 

The zfill() method in Python is used to pad a string with zeros (0) on the left side until the string reaches the specified width. In your case, you've specified a width of 4.

Here's how it works:

a = "240"

result = a.zfill(4)

print(result)

Output:

0240

In this example, the original string "240" has a length of 3. The zfill(4) method pads zeros on the left side to make the length of the string 4. Therefore, the result is "0240".