Question

如何从第一个时间码获取序列中的每个后续时间码的毫秒数？

import pandas as pd

s = {1: pd.Timestamp('1970-01-28 05:28:52.235000'),
     2: pd.Timestamp('1971-02-02 12:13:23.230000'),
     3: pd.Timestamp('1970-09-04 17:14:53.120000')}

f = pd.DataFrame().from_dict(s, orient='index')

我完全不知道该怎么做，并且在没有很多运气的情况下尝试了谷歌搜索。

Answer 1

减去两个TimeStamps会给您一个Timedelta，您可以使用.dt.total_seconds()将其转换为浮点数。使用.iloc[0]从整个Series中减去第一个元素。

(f[0]-f[0].iloc[0]).dt.total_seconds()*1000
                                      # because milliseconds

#1    0.000000e+00
#2    3.199227e+10
#3    1.896396e+10
#Name: 0, dtype: float64

Answer 2

使用DataFrame操作进行此操作，以便Pandas完成工作。 @import Foundation; @import Firebase; @import UIKit; + (void)sendMajorOSVersionToFirebase { // This can only be executed once per app session. UIDevice *myDevice = [UIDevice currentDevice]; NSString *iOSVersion = [myDevice systemVersion]; NSString *majorVersionNum; // Two methods of getting the major version from the string // Method 1: componentsSeparatedByString NSArray *systemVersionArray = [iOSVersion componentsSeparatedByString:@"."]; majorVersionNum = [systemVersionArray firstObject]; // Method 2: range and substringToIndex NSRange range = [iOSVersion rangeOfString:@"." options: nil]; majorVersion = [iOSVersion substringToIndex: range.location]; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ [FIRAnalytics setUserPropertyString:majorVersion forName:@"iOSMajorVersion"]; }); }显示第一个值和每个后续值之间的毫秒差。 import Firebase import Foundation import UIKit class func sendMajorOSVersionToFirebase() { // This can only be executed once per app session. let myDevice = UIDevice.current let iOSVersion = myDevice.systemVersion var majorVersionNum: String // Two methods of getting the major version from the string // Method 1: componentsSeparatedByString let systemVersionArray = iOSVersion.components(separatedBy: ".") majorVersionNum = systemVersionArray.first ?? "" // Method 2: range and substringToIndex let range: NSRange = (iOSVersion as NSString).range(of: ".", options: nil) majorVersion = (iOSVersion as? NSString)?.substring(to: range.location) // TODO: ensure that the code below is executed only once. { FIRAnalytics.setUserPropertyString(majorVersion, forName: @"iOSMajorVersion") } }显示每行之间的毫秒数。

total_delta_time_ms

时间码系列，每个时间码与第一个时间码之间存在差异

2 个答案: