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Python String zfill() - GeeksforGeeks

Last Updated : 02 Jan, 2025

zfill() method in Python is used to pad a string with zeros (0) on the left until it reaches a specified width. In this article, we'll see how zfill() method works.

s = "42"

padded_text = s.zfill(5)
print(padded_text) 

• The string "42" is padded with three zeros on the left to make its total length 5.
• The zfill() method ensures that the string is right-aligned and padded with zeros.

string.zfill(width)

• width (required):
  • The total length of the string after padding.
  • If the specified width is less than or equal to the length of the original string, no padding is applied.

• Returns a new string with zeros padded on the left to meet the specified width.

Let's see how zfill() behaves with a string shorter than the specified width:

s = "7"
padded_text = s.zfill(3)
print(padded_text)  

• The original string "7" has a length of 1.
• The zfill(3) method pads the string with two zeros on the left to make its total length 3.

What happens when the string length matches the specified width?

s = "12345"

padded_text = s.zfill(5)
print(padded_text) 

• The string "12345" already has a length of 5.
• No padding is added because the string length matches the specified width.

Let’s see how zfill() handles a string longer than the specified width:

s = "Python"

padded_text = s.zfill(4)
print(padded_text) 

• The string "Python" has a length of 6, which is greater than the specified width of 4.
• The method returns the original string without any changes.

When dealing with strings representing numbers, the zfill() method correctly handles the sign:

#positive and negative numbers
s1 = "42"
s2 = "-42"

print(s1.zfill(5))  
print(s2.zfill(5)) 

• For "42", zeros are added to the left to make its total length 5.
• For "-42", the minus sign is preserved, and zeros are added after the sign to maintain the width.

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