[Python 3.X] [Source] DuplicateStdout avec exemple concret suite de Fibonacci

Bonjour,

Voici un exemple simple de code permettant de loguer la sortie stdout de la console dans un fichier texte tout en conservant l'affichage dans la console (sortie dupliquée) :

Code:

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
 
import sys
import time
 
 
class DuplicateStdout:
 
    def __init__ (self, file_object):
        self.stdout = sys.stdout
        self.clone = file_object
    # end def
 
    def write (self, message):
        self.stdout.write(message)
        self.clone.write(message)
    # end def
 
    def flush (self):
        self.stdout.flush()
        self.clone.flush()
    # end def
 
    def reset (self):
        sys.stdout = self.stdout
    # end def
 
# end class
 
 
# practical example with a Fibonacci's series study
 
 
def fibonacci (n):
    """
        computing a Fibonacci's series item located at index @n;
    """
    n = int(n)
    if n < 0:
        raise IndexError("Fibonacci series starts at index 0")
    else:
        a, b = 0, 1
        for i in range(n):
            a, b = b, a + b
        # end for
        return a
    # end if
# end def
 
 
with open("fibonacci_dump.txt", "w") as file_out:
 
    # duplicate stdout into a log file
    sys.stdout = DuplicateStdout(file_out)
 
    # send messages to both stdout and file_out
    print("Searching mathematical laws in Fibonacci's series")
    print("Looking to digits count of fibo(n) result numbers...")
 
    for y in range(2, 11):
        print("\nbase =", y, "\n")
        for x in range(6):
            n = y * 10**x
            start = time.perf_counter()
            result = str(fibonacci(n))
            print(
                "{:20s}{:24s}{}".format(
                    "fibo({})".format(n),
                    "has {} digits".format(len(result)),
                    "computed in {:.8f} sec"
                    .format(time.perf_counter() - start),
                )
            )
        # end for
    # end for
 
    # return to genuine stdout
    sys.stdout.reset()
 
# end with
 
print("\nDone. OK.")

En espérant que cela vous sera utile. ;)

@+.