python 获取自然周周一周日

### 1.获取本周周一
```python
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import time
from datetime import datetime, timedelta
today = time.strftime("%Y%m%d", time.localtime())
today = datetime.strptime(str(today), "%Y%m%d")
print(datetime.strftime(today - timedelta(today.weekday()), "%Y-%m-%d"))
```

### 2.获取本周周一日期
用timedelta函数做一个小算法：
```python
from datetime import datetime, timedelta
 
 
def this_monday(today):
    """
    :function: 获取本周周一日期
    :param today:
    :return: 返回周一的日期
    :return_type: string
    """
    today = datetime.strptime(str(today), "%Y%m%d")
    return datetime.strftime(today - timedelta(today.weekday()), "%Y%m%d")
```

### 3.获取本周周日日期
算法同上
```python
from datetime import datetime, timedelta
 
 
def this_sunday(today):
    """
    :function: 获取本周周日日期
    :param today:
    :return: 返回周日日期
    :return_type: string
    """
    today = datetime.strptime(str(today), "%Y%m%d")
    return datetime.strftime(today + timedelta(7 - today.weekday() - 1), "%Y%m%d")
```

### 4.获取当前周 周一和周末时间
```python
import datetime

def get_current_week():
    monday, sunday = datetime.date.today(), datetime.date.today()
    one_day = datetime.timedelta(days=1)
    while monday.weekday() != 0:
        monday -= one_day
    while sunday.weekday() != 6:
        sunday += one_day
    return monday, sunday
    # 返回时间字符串
    #  return datetime.datetime.strftime(monday, "%Y/%m/%d") + ' 00:00:00+08:00', datetime.datetime.strftime(sunday, "%Y/%m/%d")+ ' 23:59:59+08:00'

print(get_current_week())
```

参考自：
>https://blog.csdn.net/f919976711/article/details/111046649
>https://blog.csdn.net/weixin_44541001/article/details/106208969
>https://www.runoob.com/python/python-date-time.html