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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def map_colors(arr, crange, cmap, hex=True):
 """ Maps an array of values to RGB hex strings, given a color range and colormap. """

    if isinstance(crange, np.ndarray):
        xsorted = np.argsort(crange)
        ypos = np.searchsorted(crange, arr)
        arr = xsorted[ypos]
    else:
        if isinstance(crange, tuple):
            cmin, cmax = crange
        else:
            cmin, cmax = np.nanmin(arr), np.nanmax(arr)
        arr = (arr - cmin) / (cmax-cmin)
        arr = np.ma.array(arr, mask=np.logical_not(np.isfinite(arr)))
    arr = cmap(arr)
    if hex:
        return rgb2hex(arr)
    else:
        return arr