Programme ecrit_2007_rattrapage_202_.py

# coding: latin-1
def puiss (x, n) :
    s = 1.0
    for i in range (0,n) :
        s *= x
    return s

def log_suite (x) :
    x    = float (x-1)
    # ......
    s    = 0
    old  = -1
    n    = 1
    while abs (old - s) > 1e-10 :
        old = s
        po  = puiss (x,n) / n
        if n % 2 == 0 : po = -po
        s  += po
        n  += 1
        # ......
    return s

print log_suite (2)