# Python : How to pad strings with zero, space or some other character ?

In this article we will discuss how to do left padding of strings or right padding of strings either with zero, space or some other character.

## Left padding of string in Python

Left padding a string means adding a given character at the left side of string to make it of a given length. Let’s understand by an examples,

Suppose we have a number string i.e. “5”. Now we want to convert this string of length 1 to a string of length 4 by,

• Left padding three zeros to the string i.e. “0005”
• Left padding three space to the string i.e. ”Â  Â 5″
• Left padding three characters to the string i.e. “—5”

Let’s see how to do that with examples,

### Left pad a string with zeros using string.zfill()

```numStr = "5"
print('Original String :', numStr)

# Left pad the string with 0 to make it's length 4
numStr = numStr.zfill(4)

print('Updated String :' , numStr)```

Output:

```Original String : 5
Updated String : 0005
```

string.zfill(s, width) pads a given string on the left with zeros (0) until length of string reaches the given width.

Here, 3 zeros are padded to the left of given string to make it’s length 4.

### Left pad a string with space using string.rjust()

string.rjust()

`string.rjust(s, width[, fillchar])`

string.rjust() makes the given string right justified by padding fillchar to the left of string to make it’s length equal to given width. Let’s use it,

```numStr = "5"
print('Original String :', numStr)

# Make string right justified of length 4 by padding 3 spaces to left
numStr = numStr.rjust(4, ' ')

print('Updated String :', numStr)
```

Output:

```Original String : 5
Updated String :    5```

Here, 3 spaces are padded to the left of given string to make it’s length 5.

### Left pad a string with some character using string.rjust()

We can pass the fill character in string.rjust(s, width[, fillchar]) to left pad the given string by that give character (fillchar) i.e.

```numStr = "5"
print('Original String :', numStr)

# Make string right justified of length 4 by padding 3 '-' to left
numStr = numStr.rjust(4, '-')

print('Updated String :', numStr)
```

Output:

```Original String : 5
Updated String : ---5
```

Here, three ‘-‘ are padded to the left of given string to make it’s length 4.

## Right padding of string in Python

Right padding a string means adding a given character at the right side of string to make it of a given length. Let’s understand by an examples,

Suppose we have a number string i.e. “John”. Now we want to convert this string of length 4 to a string of length 7 by,

• Right padding three zeros to the string i.e. “John000”
• Right padding three space to the string i.e. “JohnÂ  Â “
• Right padding three characters to the string i.e. “John—“

Let’s see how to do that with examples,

### Right pad a string with zeros using string.ljust()

`string.ljust(s, width[, fillchar])`

string.ljust() makes the given string left justified by padding a given character (i.e. fillchar) to the left of string to make it’s length equal to given width. Let’s use it,

```numStr = "45"
print('Original String :', numStr)

# Make string left justified of length 5 by padding 3 0s to the right of it
numStr = numStr.ljust(5, '0')

print('Updated String :', numStr)
```

Output:

```Original String : 45
Updated String : 45000```

Here, 3 zeros are padded to the right of given string to make it’s length 5.

### Right pad a string with space using string.ljust()

```userName = "John"

# Make string left justified of length 7 by padding 3 spaces to the right of it

print('Updated String :' , userName, 'is')
```

Output:

```Original String : John
Updated String : John    is
```

Here, 3 spaces are padded to the right of given string to make it’s length 7.

### Right pad a string with some character using string.ljust()

We can pass the a fill character in string.ljust(s, width[, fillchar]) to right pad the given string by that character ( i.e. fillchar) i.e.

```userName = "John"

# Make string left justified of length 7 by padding 3 '-' to the right of it

```

Output:

```Original String : John
Updated String : John---
```

Here, three ‘-‘ are padded to the right of given string to make it’s length 7.

Complete example is as follows,

```def main():

print('**** Left pad a string with 0 using s.zfill() ****')

numStr = "5"
print('Original String :', numStr)

# Left pad the string with 0 to make it's length 4
numStr = numStr.zfill(4)

print('Updated String :' , numStr)

print('**** Left pad a string with space using string.rjust() ****')

numStr = "5"
print('Original String :', numStr)

# Make string right justified of length 4 by padding 3 spaces to left
numStr = numStr.rjust(4, ' ')

print('Updated String :', numStr)

print('**** Left pad a string with a character using string.rjust() ****')

numStr = "5"
print('Original String :', numStr)

# Make string right justified of length 4 by padding 3 '-' to left
numStr = numStr.rjust(4, '-')

print('Updated String :', numStr)

print('**** Right pad a string with zeros using string.rjust() ****')

numStr = "45"
print('Original String :', numStr)

# Make string left justified of length 5 by padding 3 0s to the right of it
numStr = numStr.ljust(5, '0')

print('Updated String :', numStr)

print('**** Right pad a string with space using string.rjust() ****')

# Make string left justified of length 7 by padding 3 spaces to the right of it

print('Updated String :' , userName, 'is')

print('**** Right pad a string with a character using string.rjust() ****')

# Make string left justified of length 7 by padding 3 '-' to the right of it

if __name__ == '__main__':
main()

```

Output:

```**** Left pad a string with 0 using s.zfill() ****
Original String : 5
Updated String : 0005
**** Left pad a string with space using string.rjust() ****
Original String : 5
Updated String :    5
**** Left pad a string with a character using string.rjust() ****
Original String : 5
Updated String : ---5
**** Right pad a string with zeros using string.rjust() ****
Original String : 45
Updated String : 45000
**** Right pad a string with space using string.rjust() ****
Original String : John
Updated String : John    is
**** Right pad a string with a character using string.rjust() ****
Original String : John
Updated String : John---
```

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