Q.What will the following expression be evaluated to in Python? print(4+3*5/3-5%2)

The key idea is operator precedence and associativity in Python.

1. Multiplication (*), division (/) and modulo (%) have higher precedence than addition (+) and subtraction (-). Operators of equal precedence are evaluated left to right.
2. 3 * 5 gives 15. Expression becomes 4 + 15 / 3 - 5 % 2.
3. 15 / 3 gives 5.0 (the / operator always produces a float). Expression becomes 4 + 5.0 - 5 % 2. …

When Python evaluates an arithmetic expression it does not simply read left to right — it follows operator precedence (which operations happen first) and associativity (the order among operators of equal precedence). This is the same BODMAS/PEMDAS idea from mathematics.

The operators here rank as follows:

*, / and % share the same (higher) precedence, so they run left to right first; then + and - run left to right.

Step by step for 4 + 3 * 5 / 3 - 5 % 2:

1. 3 * 5 = 15 → 4 + 15 / 3 - 5 % 2 …