Operator
Arithmetic Operator
| Operator | description |
|---|---|
| + | Add-Add two objects |
| - | Subtract-get a negative number or subtract one number from another |
| * | Multiply-Multiply two numbers or return a string repeated several times |
| / | Divide-x divided by y |
| % | Modulo-returns the remainder of the division |
| ** | Power-returns x to the power of y |
| // | Divide-round down to the nearest quotient |
Assignment operator
| Operator | description |
|---|---|
| = | The simple assignment operator c = a + b assigns the result of a + b to c |
| += | The addition assignment operator c += a is equivalent to c = c + a |
| -= | The subtraction assignment operator c -= a is equivalent to c = c-a |
| *= | The multiplication assignment operator c *= a is equivalent to c = c * a |
| /= | The division assignment operator c /= a is equivalent to c = c / a |
| %= | The modulus assignment operator c %= a is equivalent to c = c% a |
| **= | The power assignment operator c **= a is equivalent to c = c ** a |
| //= | The integer division assignment operator c //= a is equivalent to c = c // a |
| := | Walrus operator, which can assign values to variables inside expressions. New operators in Python3.8 |
Comparison operator
| Operator | description |
|---|---|
| == | Equal to-compare whether the objects are equal |
| != | Not Equal-Compare whether two objects are not equal (a != b) returns True. |
| > | Greater than-Returns whether x is greater than y (a> b) returns False. |
| < | Less than-Returns whether x is less than y. All comparison operators return 1 for true and 0 for false. This is equivalent to the special variables True and False respectively. Note the capitalization of these variable names. (a <b) Return True. |
| >= | Greater than or equal to-returns whether x is greater than or equal to y. (a >= b) returns False. |
| <= | Less than or equal to-returns whether x is less than or equal to y. (a <= b) returns True. |
Logical Operators
Python language supports logical operators. The following assumes that the variable a is 10 and b is 20:
| Operator | Logical expression | description |
|---|---|---|
| and | x and y | Boolean "and"-If x is False, x and y return the value of x, otherwise return the calculated value of y. (a and b) Return 20. |
| or | x or y | Boolean "or"-If x is True, it returns the value of x, otherwise it returns the calculated value of y. (a or b) returns 10. |
| not | not x | Boolean "not"-If x is True, return False. If x is False, it returns True. not(a and b) returns False |
Conditional operator
Expression 1 if statement else expression 2
a = 10
b = 20
c = 'a 大' if a > b else 'b 大'
print(c)
operation
Realize 521 xxx in 4 ways of formatting strings. Will you marry me?
n = 'XXX'
a = '521 XXX 嫁给我好吗？'
b = '%d %s 嫁给我好吗？' % (521, n)
c = '521 {} 嫁给我好吗？'.format(n)
d = f'521 {n} 嫁给我好吗？'
print(a)
print(b)
print(c)
print(d)
Now there are three variables, abc, and three values are stored in the three variables. Please use the conditional operator to get the maximum of the three values
a = 3
b = 9
c = 5
d = a if a > b else b
d = d if d > c else c
print(d)