[Python] Specify string format for numeric during conversion to pl.String

Is there any way to specify a format specifier if, for example, casting a pl.Float32, without resorting to complex searches for the period character? As in something like:

s = pl.Series([1.2345, 2.3456, 3.4567])

s.cast(pl.String, format="%0.2f") # format obviously isn't an argument


My current method is the following:

n = 2 # number of decimals desired
expr = pl.concat_str((
s.floor().cast(pl.Int32).cast(pl.String),
pl.lit('.'),
((s%1)*(10**n)).round(0).cast(pl.Int32).cast(pl.String)
)).str.pad_end(width)


i.e separate the pre-decimal and post-decimal, format individually as strings, and concat together. Is there an easier way to do this?

Expected output:


shape: (3,)
Series: '' [str]
[
"1.23"
"2.34"
"3.45"
]

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