我有一个数据框，其中的一列包含表示日期和时间的字符串，如下所示：
0 Fri Oct 19 17:42:31 2018
1 Fri Oct 19 17:42:31 2018
2 Fri Oct 19 17:42:31 2018
3 Fri Oct 19 17:42:31 2018
4 Fri Oct 19 17:42:31 2018
如何解析字符串以获取日期时间格式的时间和数据？
答案 0 :(得分：3)
只需使用pd.to_datetime()：
import pandas as pd
df = pd.DataFrame([
['Fri Oct 19 17:42:31 2018'],
['Fri Oct 19 17:42:31 2018'],
['Fri Oct 19 17:42:31 2018'],
['Fri Oct 19 17:42:31 2018'],
['Fri Oct 19 17:42:31 2018']],
columns=['Date'])
df['Date'] = pd.to_datetime(df['Date'])
收益：
Date
0 2018-10-19 17:42:31
1 2018-10-19 17:42:31
2 2018-10-19 17:42:31
3 2018-10-19 17:42:31
4 2018-10-19 17:42:31
根据@ALollz的评论，您可以指定格式以提高性能：
df['Date'] = pd.to_datetime(df['Date'], format='%a %b %d %H:%M:%S %Y')
答案 1 :(得分：1)
您可以尝试describe('MyCustomComponent', () => {
let component: MyCustomComponent;
let fixture: ComponentFixture<MyCustomComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [
MyCustomComponent,
MyCustomDirective
]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(MyCustomComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('displays a button with the directive', () => {
const buttonWithDirective = fixture.debugElement.query(By.css('#with-directive'));
const directiveInstance: MyCustomDirective = buttonWithDirective.injector.get(MyCustomDirective);
expect(directiveInstance.myVariable).toBe('hello there!');
const buttonWithoutDirective = fixture.debugElement.query(By.css('#without-directive'));
//danger!! this will throw an exception because there is no directive
//const directiveInstance: MyCustomDirective = buttonWithDirective.injector.get(MyCustomDirective);
});
});
。这会将字符串中的日期时间转换为日期时间对象，并存储在同一列中。让我知道这是否适用于您的数据框。您必须df['column_name']=pd.to_datetime(df['column_name'])才能运行。