Différence entre deux dates

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from datetime import date,  timedelta
from calendar import SATURDAY,  SUNDAY
 
def parse(my_date):
    d, m, y = map(int, my_date.split('/'))
    return date(y, m, d)
 
def days_diff(date_1, date_2):
    """date of type 15/05/1972"""
    return abs((parse(date_1) - parse(date_2)).days)

def work_days(date_1,  n):
    """
    numbers of days of work
    n -> result of function days_diff
    """
    somme = 0
    info = parse(date_1)
    for n in range(n):
        days = info + timedelta(days=n)
        if days.weekday() == SATURDAY or days.weekday() == SUNDAY:
            somme += 1
    return n - somme
    

DATE_1 = '25/5/1955'
DATE_2 = '28/8/2013'
n_days = days_diff(DATE_1,  DATE_2) # 21280 days
print(work_days(DATE_1, n_days)) # 15199 days working

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from datetime import date, timedelta

def ecartdates_swe(D1, D2):
    """calcule le nombre de jours entre D1 et D2 sans les samedis+dimanches
       D2 doit être postérieur ou égal à D1
       D1 et D2 sont donnés en chaine selon le format: "j/m/aaaa"
    """
    d1 = date(*map(int, D1.split('/')[::-1]))
    d2 = date(*map(int, D2.split('/')[::-1]))
    unjour = timedelta(1)
    n = 0
    while d1<d2:
        if d1.weekday() not in [5, 6]:
            n += 1
        d1 += unjour
    return n

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from time import clock

joursemaine = [u"lundi", u"mardi", u"mercredi", u"jeudi", u"vendredi", u"samedi", u"dimanche"]

# conversion 'j/m/aaaa' ==> [aaaa, m, j] ==> objet date
faitdate = lambda D: date(*map(int, D.split('/')[::-1]))

D1 = '25/5/1955'
D2 = '28/8/2013'

t = clock()
n = ecartdates_swe(D1, D2)
t = clock()-t

d1 = faitdate(D1)
d2 = faitdate(D2)

print u"Nombre total de jours entre le %s %s et le %s %s: %d" % (joursemaine[d1.weekday()], D1, joursemaine[d2.weekday()], D2, (d2-d1).days)
print u"Idem sans les samedis+dimanches: %d" % (n,) 
print u"Durée du calcul: %.3f seconde(s)" % (t,)

d1=datetime.strptime(D1, '%d/%m/%Y').date()

d1 = date(*map(int, D1.split('/')[::-1]))

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def parse(my_date):
    d, m, y = map(int, my_date.split('/'))
    return date(y, m, d)
 
def days_diff(date_1, date_2):
    """date of type 15/05/1972"""
    return ((parse(date_1)) - (parse(date_2))).days

def vac():
    date_today=time.strftime('%d/%m/%Y',time.localtime())
    #recuperation des dates vacances
    tab_vac = pd.read_csv('vacances.csv' , delimiter =';', encoding='ISO-8859-1')
    tab_vac = tab_vac.dropna(how='all')  #Netoyage du tableau
    tab_vac = tab_vac.dropna(axis =1, how='all') #Netoyage du tableau
    long = len(tab_vac)
    for n in range(1,long):
        n_days = days_diff(DATE_1,  DATE_2)
        print(n_days)
        if n_days >= 0:
            print("oui")

    
DATE_1 = '25/05/1955'
DATE_2 = '28/08/2013'           
n_days = days_diff(DATE_1,  DATE_2) # 21280 days
print(n_days)

vac()

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-21280

  File "C:\Users\meine\Desktop\PAUL\AppliPython\prevV1.py", line 115, in <module>
    vac()

  File "C:\Users\meine\Desktop\PAUL\AppliPython\prevV1.py", line 29, in vac
    n_days = days_diff(DATE_1,  DATE_2)

  File "C:\Users\meine\Desktop\PAUL\AppliPython\prevV1.py", line 19, in days_diff
    return ((parse(date_1)) - (parse(date_2))).days

  File "C:\Users\meine\Desktop\PAUL\AppliPython\prevV1.py", line 15, in parse
    return date(y, m, d)

TypeError: 'str' object is not callable