Python Tutorial ( PDFDrive )

if ( id(a) == id(b) ):
print "Line 2 - a and b have same identity"
else:
print "Line 2 - a and b do not have same identity"
b = 30
if ( a is b ):
print "Line 3 - a and b have same identity"
else:
print "Line 3 - a and b do not have same identity"
if ( a is not b ):
print "Line 4 - a and b do not have same identity"
else:
print "Line 4 - a and b have same identity"
When you execute the above program, it produces the following result:
Line 1 - a and b have same identity
Line 2 - a and b have same identity
Line 3 - a and b do not have same identity
Line 4 - a and b do not have same identity
Python Operators Precedence
Operator precedence determines the grouping of terms in an expression. This affects how an expression is
evaluated. Certain operators have higher precedence than others; for example, the multiplication operator has
higher precedence than the addition operator.
For example, x = 7 + 3 * 2; here, x is assigned 13, not 20 because operator * has higher precedence than +, so it
first multiplies 3*2 and then adds into 7.
Here, operators with the highest precedence appear at the top of the table, those with the lowest appear at the
bottom. Within an expression, higher precedence operators will be evaluated first.
The following table lists all operators from highest precedence to lowest:
Operator
Description
** Exponentiation (raise to the power)
~ + - Complement, unary plus and minus (method names for the last two are +@ and -@)
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