NumPy char | ljust method
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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. fillcharlink | 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".
