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Articles on Trending Technologies
Technical articles with clear explanations and examples
Why do I get different timestamps in python on different machines?
A timestamp represents a specific point in time as a numerical value. It typically measures the number of seconds that have elapsed since the Unix epoch, which is January 1, 1970, at 00:00:00 Coordinated Universal Time (UTC). The main reasons behind timestamp variations on different machines include differences in time zones, system clocks, locale settings, and the use of UTC and local time (such as IST, PST, or CET). In this article, we will explore timestamp differences across different machines by considering the following key factors. Different System Time Zones If each system were set to different ...
Read MoreHow do I get an ISO 8601 date in string format in Python?
The ISO 8601 standard defines an internationally recognised format for representing dates and times. ISO 8601 is a date and time format that helps remove different forms of the day, date, and time conventions worldwide. In this article, we will discuss several methods to get an ISO 8601 date in string format in Python. ISO 8601 Date Format In Python, ISO 8601 date is represented as "YYYY-MM-DDTHH:MM:SS.mmmmmm" format. For example, August 25, 2023, is represented as 2023-08-25T14:35:45.123456. YYYY: Year (four digits) MM: Month (from 1-12) ...
Read MoreHow to convert Python DateTime string into integer milliseconds?
Python provides the time and datetime modules to convert a DateTime string into integer milliseconds. Key functions include time.time(), which gives the current time in seconds, and datetime.timestamp(), which converts datetime objects directly into seconds since the epoch. By multiplying these values by 1000, we can get the time in milliseconds. Using time.time() Method The time module in Python provides various methods and functions related to time. Here we use the time.time() method to get the current CPU time in seconds. The time is calculated since the epoch, which returns a floating-point number expressed in seconds. This value ...
Read MoreHow to compare calendar.timegm() vs. time.mktime() in Python?
In Python, the mktime() function (from the time module) assumes that the passed tuple is in local time, while the calendar.timegm() (from the calendar module) assumes it's in GMT/UTC. Depending on the interpretation, the tuple represents a different time, so both functions return different values (seconds since the epoch are UTC-based). The difference between the values should be equal to the time zone offset of your local time zone. Understanding time.mktime() in Local Time Context The Python time.mktime() method converts the object form of local time into seconds since the epoch (January 1, 1970, 00:00:00 UTC). ...
Read MoreHow to convert timestamp string to datetime object in Python?
In many real-world applications, timestamps are used to represent dates and times, but they are not human-readable. To make them understandable or use them in various datetime manipulations, it's essential to convert them into Python's datetime object. Python's datetime module provides multiple functions to convert timestamps to datetime objects. Below are the various methods to accomplish this task ? Using datetime.fromtimestamp() Function Using datetime.fromtimestamp() & strftime() Using datetime.strptime() Function Parsing Mixed Text Using strptime() Function Using datetime.fromtimestamp() Function ...
Read MoreHow to measure elapsed time in python?
To measure time elapsed during program execution, Python provides several methods. The most common approaches are using time.time(), time.perf_counter(), or the timeit module for benchmarking purposes. Using time.time() The simplest method uses time.time() to capture timestamps before and after code execution − import time t0 = time.time() print("Hello") time.sleep(0.001) # Simulate some work t1 = time.time() - t0 print("Time elapsed:", t1, "seconds") Hello Time elapsed: 0.0015020370483398438 seconds Using time.perf_counter() (Recommended) For more precise measurements, use time.perf_counter() which provides the highest available resolution − import time ...
Read MoreHow to compare Python string formatting: % with .format?
Python provides two main approaches for string formatting: the older % formatting (printf-style) and the newer .format() method. Understanding their differences helps you choose the right approach for your code. % Formatting Issues The % operator can take either a variable or a tuple, which creates potential confusion. Here's a common pitfall ? my_tuple = (1, 2, 3) try: result = "My tuple: %s" % my_tuple print(result) except TypeError as e: print(f"Error: {e}") Error: not enough arguments for format string ...
Read MoreHow to get the timing Execution Speed of Python Code?
Measuring the execution time of Python code is essential for performance optimization and benchmarking. Python provides several built-in modules like time and timeit to accurately measure code execution speed. Using time Module The time.perf_counter() function provides the highest available resolution and is recommended for measuring short durations ? import time t0 = time.perf_counter() print("Hello") t1 = time.perf_counter() print("Time elapsed:", t1 - t0, "seconds") Hello Time elapsed: 2.7499999851558823e-05 seconds Using time.time() For wall-clock time measurement, you can use time.time() ? import time start = time.time() # Simulate ...
Read MoreHow to find if 24 hrs have passed between datetimes in Python?
To determine if 24 hours have passed between two datetimes in Python, you need to calculate the time difference and compare it to a 24-hour duration. The datetime module provides tools to perform this calculation using timedelta objects. Basic Approach Using total_seconds() Subtract two datetime objects to get a timedelta, then use total_seconds() to compare with 24 hours in seconds ⏤ from datetime import datetime NUMBER_OF_SECONDS = 86400 # seconds in 24 hours first = datetime(2017, 10, 10) second = datetime(2017, 10, 12) if abs((second - first).total_seconds()) > NUMBER_OF_SECONDS: ...
Read MoreHow do I get time of a Python program\'s execution?
Python provides different ways to measure the execution time of a script or specific code segments. The most common approaches use functions from the time module like time.time() and time.process_time(), or the dedicated timeit module for precise measurements. Here are the main methods to measure execution time in Python: Using time.time() Function Using time.process_time() Function Using timeit Module Using time.time() Function The time.time() function returns the current time as a floating-point number representing seconds since the Unix epoch (January 1, 1970). This ...
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