在 Python 中將日期時間陣列轉換為字串陣列,並傳遞單位
要在 Python NumPy 中將日期時間陣列轉換為字串陣列,可以使用 numpy.datetime_as_string() 方法。此方法返回一個與輸入陣列形狀相同的字串陣列。第一個引數是要格式化的 UTC 時間戳陣列。“units”引數設定日期時間單位以更改精度。我們傳遞了秒單位。
步驟
首先,匯入所需的庫:
import numpy as np
建立一個 datetime 陣列。'M' 型別指定 datetime:
arr = np.arange('2022-02-20T02:10', 6*60, 60, dtype='M8[m]')
顯示我們的陣列:
print("Array...\n",arr)
獲取資料型別:
print("\nArray datatype...\n",arr.dtype)
獲取陣列的維度:
print("\nArray Dimensions...\n",arr.ndim)
獲取陣列的形狀:
print("\nOur Array Shape...\n",arr.shape)
獲取陣列的元素個數:
print("\nNumber of elements in the Array...\n",arr.size)
# 要在 Python NumPy 中將日期時間陣列轉換為字串陣列,可以使用 numpy.datetime_as_string() 方法
# 此方法返回一個與輸入陣列形狀相同的字串陣列:
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'))
輸出
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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