The computation speed of Python, C #, Golang, and Pypy is irresponsible,

The computation speed of Python, C #, Golang, and Pypy is irresponsible,

Recently I have been studying C # And Golang and want to compare their performance.

The code is poorly written for reference only.

Modify the code from http://www.linuxidc.com/linux/2014-08/105982.htm.

 

First go to C #

1 using System; 2 using System. collections. generic; 3 using System. linq; 4 using System. text; 5 using System. threading. tasks; 6 7 namespace Test 8 {9 class Program10 {11 static void Main (string [] args) 12 {13 System. diagnostics. stopwatch stopwatch = new System. diagnostics. stopwatch (); 14 stopwatch. start (); // Start monitoring code 15 int range = (int) Math. pow (10, 7); 16 Console. writeLine ("{0} {1}", range, range); 17 IList <int> listA = new List <int> (); 18 for (int I = 0; I <range; I ++) 19 {20 listA. add (I + 1); 21} 22 foreach (int item in listA) 23 {24 if (Check (item) 25 {26 double sqitem = Math. pow (item, 2); 27 if (Check (sqitem) {Console. writeLine ("{0} {1}", item, sqitem) ;}28} 29} 30 stopwatch. stop (); // Stop monitoring 31 TimeSpan timeSpan = stopwatch. elapsed; // get the total time 32 int hours = Convert. toInt32 (timeSpan. totalHours); // 33 int minutes = Convert. toInt32 (timeSpan. totalMinutes); // minute 34 int seconds = Convert. toInt32 (timeSpan. totalSeconds); // number of seconds 35 double milliseconds = timeSpan. totalMilliseconds; // 36 consoles in milliseconds. writeLine ("Total time {0}, hour {1}, minute {2}, number of seconds {3}, millisecond count {4}", timeSpan, hours, minutes, seconds, milliseconds); 37 Console. readLine (); 38} 39 40 static bool Check (int num) {41 int a = num; 42 char [] B = Convert. toString (). toCharArray (); 43 Array. reverse (B); 44 string c = Convert. toString (a); 45 string d = new string (B); 46 return c = d; 47} 48 static bool Check (double num) {49 double a = num; 50 char [] B = Convert. toString (). toCharArray (); 51 Array. reverse (B); 52 string c = Convert. toString (a); 53 string d = new string (B); 54 return c = d; 55} 56} 57}

View Code

Go to Golang again

 1 package main 2 import ( 3     "fmt" 4     "time" 5     "math" 6     "strconv" 7 ) 8 func main() { 9     defer timeCost(time.Now())10     var max = math.Pow(10, 7)11     var all = makeRange(1, int(max))12     for i := range all {13         if check(i) {14             j := math.Pow(float64(i), 2)15             if check(int(j)) {16                 fmt.Println(i, j)17             }18         }19     }20 }21 22 func check(num int) bool {23     a := strconv.Itoa(num)24     b := Reverse(a)25     return a == b26 }27 28 func Reverse(s string) string {29     runes := []rune(s)30     for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {31         runes[i], runes[j] = runes[j], runes[i]32     }33     return string(runes)34 }35 36 func timeCost(start time.Time){37     terminal:=time.Since(start)38     fmt.Println(terminal)39     var str string40     fmt.Scanf("%s", str)41 }42 43 func makeRange(min, max int) []int {44     a := make([]int, max-min+1)45     for i := range a {46         a[i] = min + i47     }48     return a49 }

View Code

Python and Pypy

 1 import time 2  3 def check(num): 4     a = list(str(num)) 5     b = a[::-1] 6     return a == b 7  8 def main(): 9     all = xrange(1, 10**7)10     for i in all:11         if check(i):12             if check(i**2):13                 print i, i**214     print time.time() - t15 16 if __name__ == '__main__':17     t = time.time()18     main()

View Code

 

Test results:

	ThinkPad T450	Macbook 12"
C #	5S	9 s (mono)
Go 1.7.3	3 s	3 s
Python 1, 2.7	13 s	17 s
Pypy 5.7.1	Not tested	2 s