在 Python 中将日期时间数组转换为字符串数组,并传递单位
要在 Python NumPy 中将日期时间数组转换为字符串数组,可以使用 numpy.datetime_as_string() 方法。此方法返回一个与输入数组形状相同的字符串数组。第一个参数是要格式化的 UTC 时间戳数组。“units”参数设置日期时间单位以更改精度。我们传递了秒单位。
步骤
首先,导入所需的库:
import numpy as np
创建一个 datetime 数组。'M' 类型指定 datetime:
arr = np.arange('2022-02-20T02:10', 6*60, 60, dtype='M8[m]')
显示我们的数组:
print("Array...\n",arr)
获取数据类型:
print("\nArray datatype...\n",arr.dtype)
获取数组的维度:
print("\nArray Dimensions...\n",arr.ndim)
获取数组的形状:
print("\nOur Array Shape...\n",arr.shape)
获取数组的元素个数:
print("\nNumber of elements in the Array...\n",arr.size)
# 要在 Python NumPy 中将日期时间数组转换为字符串数组,可以使用 numpy.datetime_as_string() 方法
# 此方法返回一个与输入数组形状相同的字符串数组:
print("\nResult...\n",np.datetime_as_string(arr, unit ='s'))
示例
import numpy as np # Create an array of datetime # The 'M' type specifies datetime arr = np.arange('2022-02-20T02:10', 6*60, 60, dtype='M8[m]') # Displaying our array print("Array...\n",arr) # Get the datatype print("\nArray datatype...\n",arr.dtype) # Get the dimensions of the Array print("\nArray Dimensions...\n",arr.ndim) # Get the shape of the Array print("\nOur Array Shape...\n",arr.shape) # Get the number of elements of the Array print("\nNumber of elements in the Array...\n",arr.size) # To convert an array of datetimes into an array of strings, use the numpy.datetime_as_string() method in Python Numpy # The method returns an array of strings the same shape as the input array # The first parameter is the array of UTC timestamps to format # The "units" parameter sets the datetime unit to change the precision # We have passed the seconds unit print("\nResult...\n",np.datetime_as_string(arr, unit ='s'))
输出
Array... ['2022-02-20T02:10' '2022-02-20T03:10' '2022-02-20T04:10' '2022-02-20T05:10' '2022-02-20T06:10' '2022-02-20T07:10'] Array datatype... datetime64[m] Array Dimensions... 1 Our Array Shape... (6,) Number of elements in the Array... 6 Result... ['2022-02-20T02:10:00' '2022-02-20T03:10:00' '2022-02-20T04:10:00' '2022-02-20T05:10:00' '2022-02-20T06:10:00' '2022-02-20T07:10:00']
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