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浮動小数点数のリストの表示出力

Last updated at Posted at 2014-11-06

こんにちは。
浮動小数点数のリストを、見栄え良く print 表示出力(小数点以下の桁数を指定、float クラス の subclassing)。分数の表示(リスト)prettyfrac()と同様。

print(prettyfloat([1./3, 2./3], ndec=3)) # print pretty float numbers
# ==> [0.333, 0.667]
# ndec: a number of decimal places

def prettyfloat(x, ndec=2):
    def pfform(x):
        return ("%0." + str(ndec) + "f") % x
    pfclas = type('', (float,), {'__repr__': pfform, '__str__': pfform})
    def pf(x):
        if isinstance(x, float):
            return pfclas(x)
        else:
            return x
    return map_recur(pf, x)
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