Grundlæggende Aritmetik og Operatorpræcedens
You'll use arithmetic operators constantly in Python. Consider the most common ones and how precedence determines evaluation order.
Main Operations
12345678a = 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.
123456789print(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))
- Prefer parentheses in anything nontrivial, readability > cleverness.
- Remember
/always yields a float (even if divisible).
1. What value will this code output?
2. Which expression evaluates to 64?
3. What value will this code output?
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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
12345678a = 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.
123456789print(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))
- Prefer parentheses in anything nontrivial, readability > cleverness.
- Remember
/always yields a float (even if divisible).
1. What value will this code output?
2. Which expression evaluates to 64?
3. What value will this code output?
Tak for dine kommentarer!
