vim-profiler.py 文件源码

def stdev(arr):
    """
    Compute the standard deviation.
    """
    if sys.version_info >= (3, 0):
        import statistics
        return statistics.pstdev(arr)
    else:
        # Dependency on NumPy
        try:
            import numpy
            return numpy.std(arr, axis=0)
        except ImportError:
            return 0.