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창소입4.txt

+Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)] on win32
+Type "copyright", "credits" or "license()" for more information.
+>>> "111111".count("1")
+6
+>>> "111111".count("11")
+3
+>>> "111111".count("")
+7
+>>> #EOS 들어있음
+>>> a = "111111"
+>>> a[0]
+'1'
+>>> a[6]
+Traceback (most recent call last):
+  File "<pyshell#6>", line 1, in <module>
+    a[6]
+IndexError: string index out of range
+>>> a[5]
+'1'
+>>> a
+'111111'
+>>> a.replace("1","2")
+'222222'
+>>> a
+'111111'
+
+** 비트다루기!!
+
+Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)] on win32
+Type "copyright", "credits" or "license()" for more information.
+>>> a=0b110110
+>>> bin(a)
+'0b110110'
+>>> bin(a>>1)
+'0b11011'
+>>> bin(a>>4)
+'0b11'
+>>> bin(a<<4)
+'0b1101100000'
+>>> b=-1
+>>> bin(b)
+'-0b1'
+>>> b
+-1
+>>> bin(b<<2)
+'-0b100'
+>>> bin(9)
+'0b1001'
+>>> bin(10)
+'0b1010'
+>>> 9&10
+8
+>>> bin(8)
+'0b1000'
+>>> 0b110110110110111 ^ 0b0000001111
+28088
+>>> bint(0b110110110110111 ^ 0b0000001111)
+Traceback (most recent call last):
+  File "<pyshell#14>", line 1, in <module>
+    bint(0b110110110110111 ^ 0b0000001111)
+NameError: name 'bint' is not defined
+>>> bin(0b110110110110111 ^ 0b0000001111)
+'0b110110110111000'
+>>> bin(0b110110110110111 ^ 0o17)
+'0b110110110111000'
+>>> 0b110110110110111
+28087
+>>> a = 6
+>>> ~a
+-7
+>>> bin(~a)
+'-0b111'
+>>> bin(a)
+'0b110'
+>>> bin(-a)
+'-0b110'
+>>> 
+
+>>> a = 0b01001100
+>>> a
+76
+>>> bin(a | 0b01010101)
+'0b1011101'
+>>> bin(a & 0b10101010)
+'0b1000'
+>>> bin(a ^ 0b1111)
+'0b1000011'
+>>> bin(a & 0b0000)
+'0b0'
+>>> #맨 뒤 4개 0으로 바꾸기
+>>> bin(a & 0b1111111111111111111111111111110000)
+'0b1000000'
+>>> #보수개념
+>>> bin(a & -16)
+'0b1000000'
+>>> bin(a & -0b10000)
+'0b1000000'
+>>> 
+#음수는 1111 앞에 무한히 111이 존재함
+#-0b1 까지 set
+
+>>> a=-16
+>>> bin(a&0b1011)
+'0b0'
+>>> bin(a & -12)
+'-0b10000'
+>>> 
+
+>>> a
+ 
+-16
+>>> a ^ -1
+ 
+15
+>>> bin(0b111100001010100110100 ^ -1)
+ 
+'-0b111100001010100110101'
+>>>  
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