python学习-10 运算符1
1.加+,减-,乘*,除/
例如:
a = 1 b = 2 c = a + b print(c)
运算结果:
3
Process finished with exit code 0
a = 1 b = 2 c = a - b print(c)
运算结果:
-1
Process finished with exit code 0
a = 1 b = 2 c = a * b print(c)
运算结果:
2
Process finished with exit code 0
a = 1 b = 2 c = a / b print(c)
运算结果:
0.5
Process finished with exit code 0
2.特殊的 幂 **, 取余%,//取商
例如:
a = 1 b = 2 c = a ** b print(c)
运算结果:
1
Process finished with exit code 0
a = 9 b = 2 c = a % b print(c)
运算结果:
1
Process finished with exit code 0
a = 9 b = 2 c = a // b print(c)
运算结果:
4
Process finished with exit code 0
3.in 和 not in 表示判断
判断某个东西是否在**里
例如:
in
name = 'abd' #'abd' 字符串 ; 'a' 字符 if 'a' in name: # 如果a在name里 print('ok') else: print('error')
运行结果:
ok
Process finished with exit code 0
ps:
子字符串:
name = 'abd' #'abd' 字符串 ; 'a' 字符 #'bd' 子字符串或者叫子序列 if 'ad' in name: # 如果a在name里 print('ok') else: print('error')
运行结果:
error
Process finished with exit code 0
not in:
name = 'abd' if 'a' not in name: print('ok') else: print('error')
运行结果:
error
Process finished with exit code 0