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Structures de controle en Python
G. Dewaele
4 septembre 2017
Lycee Louis-le-Grand
Structure conditionnelle
expr_bool
True
False
instruction_1
instruction_n
if expr_bool :
instruction_1...
instruction_n...
2
Exemple
if x%2==0 :print("Pair")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair")
3
Exemple
if x%2==0 :print("Pair")
10
23x
x%2==0?x 2==0?x%2==0?
True
False
Print("Pair")
3
Exemple
if x%2==0 :print("Pair")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair")Print("Pair")
3
Exemple
if x%2==0 :print("Pair")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair")
3
Exemple
if x%2==0 :print("Pair")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair")
3
Exemple
if x%2==0 :print("Pair")
10
23x
x%2==0?x 2==0?x%2==0?
True
False
Print("Pair")
3
Exemple
if x%2==0 :print("Pair")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair")
3
Structure conditionelle (2)
expr_bool
True
False
instruction_A_1
instruction_A_n
instruction_B_1
instruction_B_n
if expr_bool :
instruction_A_1...
instruction_A_n
else :instruction_B_1...
instruction_B_n...
4
Exemple
if x%2==0 :print("Pair")
else :print("Imp.")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair") Print("Imp.")
5
Exemple
if x%2==0 :print("Pair")
else :print("Imp.")
10
23x
x%2==0?x 2==0?x%2==0?
True
False
Print("Pair") Print("Imp.")
5
Exemple
if x%2==0 :print("Pair")
else :print("Imp.")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair")Print("Pair") Print("Imp.")
5
Exemple
if x%2==0 :print("Pair")
else :print("Imp.")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair") Print("Imp.")
5
Exemple
if x%2==0 :print("Pair")
else :print("Imp.")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair") Print("Imp.")
5
Exemple
if x%2==0 :print("Pair")
else :print("Imp.")
10
23x
x%2==0?x 2==0?x%2==0?
True
False
Print("Pair") Print("Imp.")
5
Exemple
if x%2==0 :print("Pair")
else :print("Imp.")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair") Print("Imp.")Print("Imp.")
5
Exemple
if x%2==0 :print("Pair")
else :print("Imp.")
10
23x
x%2==0?x%2==0?
True
False
Print("Pair") Print("Imp.")
5
Multiples chemins avec « elif »
if x==0 :print("Nul")
elif x>=0 :print("Pos.")
else :print("Nég.")
x==0? x>=0?
True True
False False
Print("Nul") Print("Pos.") Print("Nég.")
6
Structure « while »
expr_bool
True
False
instruction_1
instruction_n
while expr_bool :
instruction_1...
instruction_n...
7
Exemple
u<5?
True
False
print(u)
u = 2*u
while u<5 :print(u)
u = 2*u
1u
8
Exemple
u<5?u<5?
True
False
print(u)
u = 2*u
while u<5 :print(u)
u = 2*u
1u
8
Exemple
u<5?
True
False
print(u)print(u)
u = 2*u
while u<5 :print(u)
u = 2*u
1u
8
Exemple
u<5?
True
False
print(u)
u = 2*uu = 2*u
while u<5 :print(u)
u = 2*u
1u
8
Exemple
u<5?u<5?
True
False
print(u)
u = 2*u
while u<5 :print(u)
u = 2*u
1
2u
8
Exemple
u<5?
True
False
print(u)print(u)
u = 2*u
while u<5 :print(u)
u = 2*u
1
2u
8
Exemple
u<5?
True
False
print(u)
u = 2*uu = 2*u
while u<5 :print(u)
u = 2*u
1
2u
8
Exemple
u<5?u<5?
True
False
print(u)
u = 2*u
while u<5 :print(u)
u = 2*u
1
2
4
u
8
Exemple
u<5?
True
False
print(u)print(u)
u = 2*u
while u<5 :print(u)
u = 2*u
1
2
4
u
8
Exemple
u<5?
True
False
print(u)
u = 2*uu = 2*u
while u<5 :print(u)
u = 2*u
1
2
4
u
8
Exemple
u<5?u<5?
True
False
print(u)
u = 2*u
while u<5 :print(u)
u = 2*u
1
2
4
8
u
8
Exemple
u<5?
True
False
print(u)
u = 2*u
while u<5 :print(u)
u = 2*u
1
2
4
8
u
8
Calcul du PGCD avec l’algorithme d’Euclide
b>0?
True
False
a,b = b,a%ba,b = b,a%b print(a)
while b>0 :a,b = b,a%b
print(a)
420
126a
b
9
Calcul du PGCD avec l’algorithme d’Euclide
b>0?b>0?
True
False
a,b = b,a%ba,b = b,a%b print(a)
while b>0 :a,b = b,a%b
print(a)
420
126a
b
9
Calcul du PGCD avec l’algorithme d’Euclide
b>0?
True
False
a,b = b,a%ba,b = b,a ba,b = b,a%b print(a)
while b>0 :a,b = b,a%b
print(a)
420
126a
b
9
Calcul du PGCD avec l’algorithme d’Euclide
b>0?b>0?
True
False
a,b = b,a%ba,b = b,a%b print(a)
while b>0 :a,b = b,a%b
print(a)
420
126
42
a
b
9
Calcul du PGCD avec l’algorithme d’Euclide
b>0?
True
False
a,b = b,a%ba,b = b,a ba,b = b,a%b print(a)
while b>0 :a,b = b,a%b
print(a)
420
126
42
a
b
9
Calcul du PGCD avec l’algorithme d’Euclide
b>0?b>0?
True
False
a,b = b,a%ba,b = b,a%b print(a)
while b>0 :a,b = b,a%b
print(a)
420
126
42
0
a
b
9
Calcul du PGCD avec l’algorithme d’Euclide
b>0?
True
False
a,b = b,a%ba,b = b,a%b print(a)print(a)
while b>0 :a,b = b,a%b
print(a)
420
126
42
0
a
b
9
Calcul du PGCD avec l’algorithme d’Euclide
b>0?
True
False
a,b = b,a%ba,b = b,a%b print(a)
while b>0 :a,b = b,a%b
print(a)
420
126
42
0
a
b
9
