def theta_str(theta, taustr=TAUSTR, fmtstr='{coeff:,.1f}{taustr}'):
    r"""
    Format theta so it is interpretable in base 10

    Args:
        theta (float) angle in radians
        taustr (str): default 2pi

    Returns:
        str : theta_str - the angle in tau units

    Example1:
        >>> # ENABLE_DOCTEST
        >>> from utool.util_str import *  # NOQA
        >>> theta = 3.1415
        >>> result = theta_str(theta)
        >>> print(result)
        0.5*2pi

    Example2:
        >>> # ENABLE_DOCTEST
        >>> from utool.util_str import *  # NOQA
        >>> theta = 6.9932
        >>> taustr = 'tau'
        >>> result = theta_str(theta, taustr)
        >>> print(result)
        1.1tau
    """
    coeff = theta / TAU
    theta_str = fmtstr.format(coeff=coeff, taustr=taustr)
    return theta_str
r"""
    Format theta so it is interpretable in base 10

    Args:
        theta (float) angle in radians
        taustr (str): default 2pi

    Returns:
        str : theta_str - the angle in tau units

    Example1:
        >>> # ENABLE_DOCTEST
        >>> from utool.util_str import *  # NOQA
        >>> theta = 3.1415
        >>> result = theta_str(theta)
        >>> print(result)
        0.5*2pi

    Example2:
        >>> # ENABLE_DOCTEST
        >>> from utool.util_str import *  # NOQA
        >>> theta = 6.9932
        >>> taustr = 'tau'
        >>> result = theta_str(theta, taustr)
        >>> print(result)
        1.1tau