3python运算符号

比较运算符

a,b=10,30
print('a>b吗？',a>b)
print('a<b吗？',a<b)
print('a<=b吗？',a>=b)
print(a is b)#这个比较的是id标识
a>b吗？ False
a<b吗？ True
a<=b吗？ False
False

布尔运算符

print(a==1 and b==2)#ture and true-->ture
print(a==1 and b<2)#ture and false-->false
print(a!=1 and b==2)#false and ture-->false
print(a!=1 and b!=2)#false and false -->false
print('---------------or 或者-----------------------------------------')
print(a==1 or b==2)#ture or true-->ture
print(a==1 or b<2)#ture or false-->ture
print(a!=1 or b==2)#false or ture-->ture
print(a!=1 or b!=2)#false and false -->false
print('---------------not 对运算数取反-----------------------------------------')
f=True
f2=False
print(not f)
print(not f2)
print('---------------in 与not in-----------------------------------------')
s='helloworld'
print('w'in s)
print('k'in s)
print('w'not in s)
print('k'not in s)
True
True
False
False
False
---------------or 或者-----------------------------------------
True
True
True
False
---------------not 对运算数取反-----------------------------------------
False
True
---------------innot in-----------------------------------------
True
False
False
True

p27

THE END