But it s generally at least under 20ms.
Python count wall clock time.
To measure time elapsed during program s execution either use time clock or time time functions.
A prerequisite before we dive into the difference of measuring time in python is to understand various types of time in the computing world.
Time module in python provides various time related functions.
It does include time elapsed during sleep and is system wide.
The duration for which we want to delay the execution is passed as an argument to the sleep function in seconds.
Note that different systems will have different accuracy based on their internal clock setup ticks per second.
The python docs state that this function should be used for benchmarking purposes.
As most of the functions defined in time module call corresponding c library function.
On windows this function returns wall clock seconds elapsed since the first call to this function as a floating point number based on the win32 function queryperformancecounter.
The first type of time is called cpu or execution time which measures how much time a cpu spent on executing a program.
For the best measure of elapsed time since python 3 3 use time perf counter.
Return the value in fractional seconds of a performance counter i e.
On unix return the current processor time as a floating point number expressed in seconds.
Pythom time method clock returns the current processor time as a floating point number expressed in seconds on unix.
The second type of time is called wall clock time which measures the total time to execute a program in a computer.
The precision depends on that of the c function of the same name but in any case this is the function to use for benchmarking python or timing algorithms.
Time clock was removed in python 3 8 because it had platform dependent behavior.
The precision of returned float value depends on the called c library function.
Time clock method also call c library function of the same name to get the result.
Perf counter function always returns the float value of time in seconds.
On windows this function returns wall clock seconds elapsed since the first call to this function as a floating point number.
Python s time library contains a predefined sleep function.
This function in combination with a loop serves as the python countdown timer.
A clock with the highest available resolution to measure a short duration.
Also note that clock returns different things on different platforms.
It does include time elapsed during sleep and is system wide.