【测试开发】python系列教程：Python 运算符

>>> 4+59>>>

算术运算符比较（关系）运算符赋值运算符逻辑运算符位运算符成员运算符身份运算符运算符优先级

>>> 5+611

>>> 6-51

>>> 4*520

>>> 10/25.0

>>> 3%21

>>> 3**29

>>> 8//32

>>> 3==2False

>>> 3!=2True

>>> 3>2True

>>> 3<2False

>>> 3>=2True

>>> 3<=2False

>>> c=1+2>>> c3

>>> c+=1>>> c4

>>> c-=2>>> c2

>>> c*=2>>> c4

>>> c/=2>>> c2.0

>>> c%=2>>> c0.0

>>> c=10>>> c**=8>>> c100000000

>>> c//137692307

>>> 10 and 2020

>>> 10 or 2010

>>> not ( 1==2)True

>>> a=[1,2,3]>>> 1 in  aTrue

>>> 1 not in  aFalse

>>> a=10>>> b=200>>> a is bFalse

>>> not (a is b)True

注：is 与 == 区别：  is 用于判断两个变量引用对象是否为同一个，   == 用于判断引用变量的值是否相等

a = 20b = 10c = 15d = 5e = 0e = (a + b) * c / d       #( 30 * 15 ) / 5print (\"(a + b) * c / d 运算结果为：\",  e) e = ((a + b) * c) / d     # (30 * 15 ) / 5print (\"((a + b) * c) / d 运算结果为：\",  e) e = (a + b) * (c / d)    # (30) * (15/5)print (\"(a + b) * (c / d) 运算结果为：\",  e)e = a + (b * c) / d      #  20 + (150/5)print (\"a + (b * c) / d 运算结果为：\",  e)

(a + b) * c / d 运算结果为：90.0((a + b) * c) / d 运算结果为：90.0(a + b) * (c / d) 运算结果为：90.0a + (b * c) / d 运算结果为：50.0