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# NumPy char | ljust method

schedule Aug 12, 2023
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NumPy's `np.char.ljust(~)` method adds padding to the input strings so that they are of the specified length, and places the strings at the left side.

# Parameters

1. `a` | `array-like`

The input array.

2. `width` | `int`

The desired length of each string.

3. `fillchar`link | `string` or `unicode` | `optional`

The characters to fill with if the specified width exceeds the size of the input string. By default, an empty space will be added.

# Return Value

A NumPy array of strings, with each string being exactly of size `width` and extra spaces filled with `fillchar`.

# Examples

## Cases when size of string is larger than width

``` np.char.ljust(["abcd", "efg"], 2) array(['ab', 'ef'], dtype='<U2') ```

Since the specified width is larger than the size of the strings, the first 2 characters were extracted.

## Case when padding is required

``` np.char.ljust(["abcd", "e"], 2) array(['ab', 'e '], dtype='<U2') ```

Notice how an empty space was added to `'e '` to ensure each returned string is of length 2, and how the character was left-aligned.

## Specifying a custom filler

Instead of an empty whitespace, we can specify our own characters to pad with:

``` np.char.ljust(["abcd", "e"], 2, "z") array(['ab', 'ez'], dtype='<U2') ```

Here, instead of `"e "`, we get `"ez"`.

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