Python 逻辑运算符,not in,in
一、逻辑运算符
and or not
优先级 () > not > and > or
1 print(4 > 3 or 4 < 3 and 1!=1)2 print(2 > 1 and 3 < 4 or 4 > 5 and 2 < 1)
3 print(1 > 2 and 3 < 4 or 4 > 5 and 2 > 1 or 9 < 8)
4 print(1 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6)
5 print(not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6)
and or not
1 print(4 or 3)2 print(2 or 3)
3 print(1 or 3)
4 print(0 or 3)
5 print(-1 or 3)
print(x or y), 如果 x 为真,则值为x,否则为y
print(x or y), 如果 x 为真,则值为y,否则为x
1 print(4 and 3)2 print(2 and 3)
3 print(1 and 3)
4 print(0 and 3)
5 print(-1 and 3)
print(x and y) 和 or 相反
1 print( 2>3 or 3)2 print( 2>2 or 0)
3 print( 2>3 or 3)
3 > 2 打印 True
二、bool 与 int 转换
bool 转换成 int 只有 0 和1
int 转换成 bool ,0为False,其他所有为True
三、in not in
1 str = 'abcdefghijklmn'2 print('a' in str)
3 print('bcde' in str)
4 print('bm' in str)
1 comment = input('Please enter comment:')2 if '台独' in comment:
3 print('Your comments contain illegal characters!')
4 else:print('Comments increasing success')
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