from __future__ import division, print_function   # Python 3
from sympy import init_printing
init_printing(use_latex='mathjax',use_unicode=False)  # Affichage des résultats

for a in range(9):

for a in [1,2,3,4]:

for a in 'bonjour':

for i in liste:                       # ligne d'en-tête
    <ligne 1 du bloc d'instruction>
    <ligne 2 du bloc d'instruction>
    ...
    <ligne n du bloc d'instruction>
<ligne exécutée après la boucle>

from sympy import factor
from sympy.abc import x
factor(x**1-1)

factor(x**2-1)

factor(x**3-1)

factor(x**4-1)

factor(x**5-1)

factor(x**6-1)

factor(x**7-1)

factor(x**8-1)

factor(x**9-1)

for k in range(1,12):

from sympy import Eq
for k in range(2, 10):

a = 5

n = 5
n = 3 * n + 1

W = x + 1

sous_total = 0
sous_total = sous_total + 1

sous_total += 1

L = [134, 13614, 73467, 1451, 134, 88]
s = 0
for a in L:

s

s = 0
for a in L:

s

sum(L)

s = 'gaston'
t = ''
for lettre in s:

t

k = 1
for _ in range(10):