python-numpy.random.randint()
numpy.random.randint
numpy.random.randint(low, high=None, size=None, dtype='l')
Return random integers from low (inclusive) to high (exclusive).
Return random integers from the “discrete uniform” distribution of the specified dtype in the “half-open” interval [low, high). If high is None (the default), then results are from [0, low
| Parameters: |
low : int Lowest (signed) integer to be drawn from the distribution (unless high : int, optional If provided, one above the largest (signed) integer to be drawn from the distribution (see above for behavior if size : int or tuple of ints, optional Output shape. If the given shape is, e.g., dtype : dtype, optional Desired dtype of the result. All dtypes are determined by their name, i.e., ‘int64’, ‘int’, etc, so byteorder is not available and a specific precision may have different C types depending on the platform. The default value is ‘np.int’. New in version 1.11.0. |
|---|---|
| Returns: |
out : int or ndarray of ints size-shaped array of random integers from the appropriate distribution, or a single such random int if size not provided. |
Examples
>>> np.random.randint(2, size=10)
array([1, 0, 0, 0, 1, 1, 0, 0, 1, 0])
>>> np.random.randint(1, size=10)
array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0])>>> np.random.randint(5, size=(2, 4))
array([[4, 0, 2, 1],
[3, 2, 2, 0]])引數說明：
low：指定了隨機數的可能最小值（包含）；
high：指定了隨機數的可能最大值（不包含）；
size：如不指定，預設值為為1，此時返回一個隨機值；
dtype：返回值的型別。
當high不指定時，即high=None，此時low值當做隨機數上界，隨機數的取值範圍為：[0,low)