Python学习之第三天相关运算符

以下代码为学习时练习所写&＃xff0c;部分输出以注释方式写在了代码之后&＃xff0c;大家可以参考&＃xff0c;还是推荐大家可以自己敲一遍&＃xff0c;加深印象。

有任何疑问欢迎留言探讨。

# 机构&＃xff1a;家里蹲
# 作者&＃xff1a;青火
# 时间&＃xff1a;2021/7/15 23:17
#算数运算符
print(1 &＃43; 1) #加法 2
print(1 - 1) #减法 0
print(2 * 2) #乘法 4
print(1 / 2) #除法 0.5
print(1 // 1.5) #整除&＃xff0c;向下取整 0.0
print(-9 // 3) # -3
print(2**4) #幂运算 16
print(11 % 2) #取余运算 1#赋值运算符 执行顺序从右到左
a &＃61; 4 &＃43; 3
print(a) # 7
a &＃61; b &＃61; c &＃61; 20 #链式赋值
print(a, b, c) # 20 20 20
b &＃61; 30
print(a, b, c) # 20 30 20
#参数赋值
print(&＃39;------------参数赋值------------&＃39;)
a &＃61; 20
print(a) # 20
a &＃43;&＃61; 30 # -&＃43; *&＃61; /&＃61; //&＃61; %&＃61;类似
print(a) # 50#系列解包赋值
a, b, c &＃61; 1, 2, 3
print(a, b, c) # 1 2 3
#a, b &＃61; 1, 2, 3 #报错&＃xff0c;左右参数个数不一致 ValueError: too many values to unpack (expected 2)a, b &＃61; 2, 3
print(a, b) #2 3
#交换
a, b &＃61; b, a
print(a, b) #3 2#比较运算符
a, b &＃61; 10, 20
print(&＃39;a > b 吗&＃xff1f;&＃39;, a > b) #a > b 吗&＃xff1f; False
print(&＃39;a print(&＃39;a >&＃61; b 吗&＃xff1f;&＃39;, a >&＃61; b) #a >&＃61; b 吗&＃xff1f; False
print(&＃39;a <&＃61; b 吗&＃xff1f;&＃39;, a <&＃61; b) #a <&＃61; b 吗&＃xff1f; True
print(&＃39;a &＃61;&＃61; b 吗&＃xff1f;&＃39;, a &＃61;&＃61; b) #a &＃61;&＃61; b 吗&＃xff1f; False
print(&＃39;a !&＃61; b 吗&＃xff1f;&＃39;, a !&＃61; b) #a !&＃61; b 吗&＃xff1f; True#比较对象 is
a &＃61; 10
b &＃61; 10
print(a &＃61;&＃61; b) #True
print(a is b) #True a与b的id相同&＃xff0c;及内存地址一样&＃xff0c;是同一个数
str01 &＃61; &＃39;123&＃39;
str02 &＃61; &＃39;123&＃39;
print(str01 &＃61;&＃61; str02) #True
print(str01 is str02) #True
print(str01 is not str02) #Falselist01 &＃61; [11, 22, 33]
list02 &＃61; [11, 22, 33]
print(list01 &＃61;&＃61; list02) #True
print(list01 is list02) #False
print(list01 is not list02) #True
print(list01, id(list01)) #[11, 22, 33] 2291482579464
print(list02, id(list02)) #[11, 22, 33] 2291482579976#布尔运算符
a, b &＃61; 1, 2
print(&＃39;------------------- and -------------------&＃39;)
print(a &＃61;&＃61; 1 and b &＃61;&＃61; 2) # True
print(a &＃61;&＃61; 1 and b <2) # False
print(a !&＃61; 1 and b &＃61;&＃61; 2) # False
print(a !&＃61; 1 and b !&＃61; 2) # Falseprint(&＃39;------------------- or -------------------&＃39;)
print(a &＃61;&＃61; 1 or b &＃61;&＃61; 2) # True
print(a &＃61;&＃61; 1 or b <2) # True
print(a !&＃61; 1 or b &＃61;&＃61; 2) # True
print(a !&＃61; 1 or b !&＃61; 2) # Falseprint(&＃39;------------------- not -------------------&＃39;)
t &＃61; True
f &＃61; False
print(not t) #False
print(not f) #Trueprint(&＃39;------------------- in 与 not in -------------------&＃39;)
s &＃61; &＃39;helloworld&＃39;
print(&＃39;w&＃39; in s) #True
print(&＃39;k&＃39; in s) #False
print(&＃39;w&＃39; not in s) #False
print(&＃39;k&＃39; not in s) #True

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