### CM-1 : affectations, string, print, list


## fct print()
a=4
b=5
# utilisation de base
print(a,b)
# écritures formatées
print("a={}, b={}".format(a,b))
print(f"a={a}, b={b}") # si python >=3.6


print('\n'+'_'*30+'\n')
## String (chaine de caracteres)
s="Bonjour le monde !"
print(f"s={s}")
print(f"s[3]={s[3]}")
print(f"s[-3]={s[-3]}")
print(f"s[:3]={s[:3]}")
print(f"s[:-3]={s[:-3]}")
print(f"s[3:]={s[3:]}")
print(f"s[-3:]={s[-3:]}")
print(f"s[::-1]={s[::-1]}")

s="ava"
print(s==s[::-1])