This guide explains Bitwise Operators: &, |, ^, ~, <<, and >> through a focused example and practical reasoning. No prior knowledge of this specific operation is required.
Understanding the Concept
Bitwise operations work on integer bit patterns. & keeps shared set bits, | combines them, ^ toggles differing bits, ~ inverts bits according to Python’s infinite two’s-complement model, and shifts move bits left or right.
When You Would Use This
Use a feature mask where individual bits represent enabled settings.
Step-by-Step Example
READ_PERMISSION = 0b001
WRITE_PERMISSION = 0b010
EXECUTE_PERMISSION = 0b100
user_permissions = READ_PERMISSION | WRITE_PERMISSION
print(bin(user_permissions))
print(bool(user_permissions & WRITE_PERMISSION))
print(user_permissions << 1)How the Example Works
The combined mask is 0b11. AND tests whether the write bit is present, returning a nonzero result. Shifting left once doubles a nonnegative integer bit pattern.
Example Output
0b11
True
6Try It Yourself
Add execute permission to the mask and test for it.
Common Beginner Mistakes
- Confusing bitwise
&and bitwise OR with short-circuitandandor. - Using
^for exponentiation. - Assuming
~xflips only a fixed number of bits without accounting for Python’s negative integer representation.
Key Takeaways
- Bitwise operations work on integer bit patterns.
- The combined mask is
0b11. - Avoid this mistake: Confusing bitwise
&and bitwise OR with short-circuitandandor.