如何打印小数点后3位的numpy数组？[重复]

 np.set_printoptions(formatter={'float': lambda x: "{0:0.3f}".format(x)})

这会将numpy设置为使用此lambda函数来格式化其打印出的每个浮点数。

您可以定义其他格式的类型（来自函数的文档字符串）

    - 'bool'    - 'int'    - 'timedelta' : a `numpy.timedelta64`    - 'datetime' : a `numpy.datetime64`    - 'float'    - 'longfloat' : 128-bit floats    - 'complexfloat'    - 'longcomplexfloat' : composed of two 128-bit floats    - 'numpy_str' : types `numpy.string_` and `numpy.unipre_`    - 'str' : all other stringsOther keys that can be used to set a group of types at once are::    - 'all' : sets all types    - 'int_kind' : sets 'int'    - 'float_kind' : sets 'float' and 'longfloat'    - 'complex_kind' : sets 'complexfloat' and 'longcomplexfloat'    - 'str_kind' : sets 'str' and 'numpystr'