有关datetime应用例子的代码解析
import numpy as np
import datetime
def call(self, database_folder='', shapefile='', track_no='',
start_date='', end_date='', start_dates='', end_dates='', date='', dates='',
time_window='', mode='IW', product_type='SLC', polarisation='VV'):
# Run the different commands step by step
# Create a list of search windows with start and end dates
if isinstance(date, datetime.datetime):
dates = [date]
elif isinstance(dates, datetime.datetime):
dates = [dates]
if isinstance(dates, list):
for date in dates:
if not isinstance(date, datetime.datetime):
raise TypeError('Input dates should be datetime objects.')
if isinstance(time_window, datetime.timedelta):
self.start_dates = [date - time_window for date in dates]
self.end_dates = [date + time_window for date in dates]
else:
self.start_dates = [date.replace(hour=0, minute=0, second=0, microsecond=0) for date in dates]
self.end_dates = [date + datetime.timedelta(days=1) for date in self.start_dates]
elif isinstance(start_date, datetime.datetime) and isinstance(end_date, datetime.datetime):
self.start_dates = [start_date]
self.end_dates = [end_date]
elif isinstance(start_dates, list) and isinstance(end_dates, list):
self.start_dates = start_dates
self.end_dates = end_dates
valid_dates = [isinstance(start_date, datetime.datetime) * isinstance(end_date, datetime.datetime) for
start_date, end_date in zip(start_dates, end_dates)]
if np.sum(valid_dates) < len(valid_dates):
raise TypeError('Input dates should be datetime objects.')
else:
raise TypeError('You should define a start or end date or a list of dates to search for Sentinel-1 data! '
'Dates should be datetime objects')
self.start_dates = np.array(self.start_dates)
self.end_dates = np.array(self.end_dates)
# 其他与本讨论无关的逻辑
self.other_concrete_logics()
从前没用过dateltime读不懂，讲一下核心逻辑和修改建议即可，谢谢！
1.这段代码的核心逻辑是要做什么
2.请画出核心逻辑的流程图；
3.这段代码（你觉得）有什么写得好或可以改进的地方？
