When more than one operator appears in an expression, the order of evaluation depends on the rules of precedence. For mathematical operators, Python follows mathematical convention. The acronym PEMDAS is a useful way to remember the rules:

Parentheses have the highest precedence and can be used to force an expression to evaluate in the order you want. Since expressions in parentheses are evaluated first, 2 * (31)
is 4, and (1+1)**(52)
is 8. You can also use parentheses to make an expression easier to read, as in (minute * 100) / 60
, even if it doesn't change the result.

Exponentiation has the next highest precedence, so 2**1+1
is 3, not 4, and 3*1**3
is 3, not 27.

Multiplication and Division have the same precedence, which is higher than Addition and Subtraction, which also have the same precedence. So 2*31
is 5, not 4, and 6+4/2
is 8.0, not 5.

Operators with the same precedence are evaluated from left to right. So the expression 531
is 1, not 3, because the 53
happens first and then 1
is subtracted from 2
.
When in doubt, always put parentheses in your expressions to make sure the computations are performed in the order you intend.