如何忽略To be continued
时间: 2024-03-03 08:52:09 浏览: 20
如果你想忽略字符串中的 "To be continued",可以先将这个字符串从时间字符串中删除,然后再解析时间字符串。你可以使用字符串的 replace 方法或者正则表达式将 "To be continued" 从时间字符串中删除,例如:
```python
import re
time_str = '2023/04/30 - To be continued'
time_str = re.sub(' - To be continued', '', time_str)
```
然后再使用你之前的解析时间的代码即可:
```python
from datetime import datetime
order_time = datetime.strptime(time_str, "%Y/%m/%d")
```
这样就可以成功解析时间字符串,忽略了 "To be continued"。
相关问题
order_time = datetime.strptime(time_str, "%Y-%m-%d %H:%M:%S") 报错:> (data_string, format)) E ValueError: time data '2023/04/30 - To be continued' does not match format '%Y-%m-%d %H:%M:%S'
这个报错提示你的时间字符串 '2023/04/30 - To be continued' 不符合你指定的时间格式 '%Y-%m-%d %H:%M:%S',因此无法被解析成一个时间对象。你需要修改时间字符串的格式或者修改解析时间的函数。你可以先检查一下时间字符串的格式是否正确,如果不正确,则需要修改时间字符串的格式;如果时间字符串格式正确,可以尝试修改解析时间的函数,例如使用 dateutil.parser.parse 函数解析时间字符串。
Atomicity (continued) - Assignment
In programming, an assignment is an operation that sets a value to a variable or a memory location. The atomicity of an assignment refers to the property that the assignment operation is indivisible and appears to occur instantaneously.
For example, suppose we have two variables `x` and `y` and we want to update them atomically. A non-atomic update might look like this:
```
x = x + 1;
y = y - 1;
```
If these two assignments are not atomic, it is possible that another thread could execute between them and read inconsistent values for `x` and `y`. For example, if `x` starts at 5 and `y` starts at 10, another thread might read `x=5` and `y=10` after the first assignment but before the second assignment.
To make these updates atomic, we can use a synchronization primitive such as a lock or a mutex to ensure that no other thread can access the variables while they are being updated:
```
lock.acquire();
x = x + 1;
y = y - 1;
lock.release();
```
By acquiring the lock before the assignments and releasing it afterwards, we ensure that the assignments occur atomically and cannot be interrupted by other threads. This guarantees that any other thread that reads `x` and `y` after the updates will see consistent values.
Atomic assignments are important in concurrent programming to ensure that shared variables are updated safely and consistently across multiple threads.
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