Apprendre Arithmétique de Base et Priorité des Opérateurs

You'll use arithmetic operators constantly in Python. Consider the most common ones and how precedence determines evaluation order.

Main Operations


              12345678
            
a = 10
b = 3

print(a + b)  # Addition
print(a - b)  # Subtraction
print(a * b)  # Multiplication
print(a / b)  # Division
print(a ** b)  # Exponentiation

Operator Precedence

When multiple operators appear, Python evaluates them in this order (highest → lowest among arithmetic):

**;
Unary + and - (sign);
*, /;
+, -.

Parentheses always win and make intent explicit. Exponentiation ** is right-associative.


              123456789
            
print(2 + 3 * 4)     # 14  (multiplication before addition)
print((2 + 3) * 4)   # 20  (parentheses change the order)

# Exponentiation binds tighter than unary minus
print(-3 ** 2)       # -9  (equivalent to -(3 ** 2))
print((-3) ** 2)     # 9

# Right-associative exponentiation
print(2 ** 3 ** 2)   # 512 (2 ** (3 ** 2))

Note

Prefer parentheses in anything nontrivial, readability > cleverness.
Remember / always yields a float (even if divisible).

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Merci pour vos commentaires !

Section 1. Chapitre 2

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You'll use arithmetic operators constantly in Python. Consider the most common ones and how precedence determines evaluation order.

Main Operations


              12345678
            
a = 10
b = 3

print(a + b)  # Addition
print(a - b)  # Subtraction
print(a * b)  # Multiplication
print(a / b)  # Division
print(a ** b)  # Exponentiation

Operator Precedence

When multiple operators appear, Python evaluates them in this order (highest → lowest among arithmetic):

**;
Unary + and - (sign);
*, /;
+, -.

Parentheses always win and make intent explicit. Exponentiation ** is right-associative.


              123456789
            
print(2 + 3 * 4)     # 14  (multiplication before addition)
print((2 + 3) * 4)   # 20  (parentheses change the order)

# Exponentiation binds tighter than unary minus
print(-3 ** 2)       # -9  (equivalent to -(3 ** 2))
print((-3) ** 2)     # 9

# Right-associative exponentiation
print(2 ** 3 ** 2)   # 512 (2 ** (3 ** 2))

Note

Prefer parentheses in anything nontrivial, readability > cleverness.
Remember / always yields a float (even if divisible).

Tout était clair ?

Merci pour vos commentaires !

Section 1. Chapitre 2

Arithmétique de Base et Priorité des Opérateurs

Main Operations

Operator Precedence

1. What value will this code output?

2. Which expression evaluates to `64`?

3. What value will this code output?

Arithmétique de Base et Priorité des Opérateurs

Main Operations

Operator Precedence

1. What value will this code output?

2. Which expression evaluates to `64`?

3. What value will this code output?

Arithmétique de Base et Priorité des Opérateurs

Main Operations

Operator Precedence

1. What value will this code output?

2. Which expression evaluates to 64?

3. What value will this code output?

Arithmétique de Base et Priorité des Opérateurs

Main Operations

Operator Precedence

1. What value will this code output?

2. Which expression evaluates to 64?

3. What value will this code output?

2. Which expression evaluates to `64`?

2. Which expression evaluates to `64`?