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11-13일수업내용

+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 = "111111"
+>>> a.count("1")
+6
+>>> a.count("11")
+3
+>>> a.replace("111","2")
+'22'
+>>> import math
+>>> import math as m
+>>> m.pi
+3.141592653589793
+>>> m.sin(pi)
+Traceback (most recent call last):
+  File "<pyshell#7>", line 1, in <module>
+    m.sin(pi)
+NameError: name 'pi' is not defined
+>>> m.sin(0.0)
+0.0
+>>> a = 0b110110
+>>> a
+54
+>>> bin(a)
+'0b110110'
+>>> a >> 1
+27
+>>> bin(a)
+'0b110110'
+>>> bin(a >> 1)
+'0b11011'
+>>> bin(a << 4)
+'0b1101100000'
+>>> bin(a )
+'0b110110'
+>>> bin(a >> 5)
+'0b1'
+>>> b = -1
+>>> bin(b)
+'-0b1'
+>>> 9^10
+3
+>>> bin(0b110110110110111 ^ ox1111)
+Traceback (most recent call last):
+  File "<pyshell#21>", line 1, in <module>
+    bin(0b110110110110111 ^ ox1111)
+NameError: name 'ox1111' is not defined
+>>> bin(0b110110110111 ^ 0b1111)
+'0b110110111000'
+>>> bin(0b110110110111 ^ 0xf)
+'0b110110111000'
+>>> bin(0b110110110111 ^ 15)
+'0b110110111000'
+>>> bin(0b110110110111 ^ 0o17)
+'0b110110111000'
+>>> a = 2340
+>>> ~a
+-2341
+>>> bin(a)
+'0b100100100100'
+>>> bin(-a)
+'-0b100100100100'
+>>> bin(~a)
+'-0b100100100101'
+>>> bin(7)
+'0b111'
+>>> bin(~7)
+'-0b1000'
+>>> ~7
+-8
+>>> a = 0b01001100
+>>> bin(a | 0b01010101)
+'0b1011101'
+>>> bin(a & 0b10101010)
+'0b1000'
+>>> bin(a ^ 0b1111)
+'0b1000011'
+>>> bin(a & 0b0000)
+'0b0'
+>>> -0b1000
+-8
+>>> bin(a & -0b1000)
+'0b1001000'
+>>> bin(a & 0b1000)
+'0b1000'
+>>> bin(-18)
+'-0b10010'
+>>> bin(~15)
+'-0b10000'
+>>> a=15
+>>> ~a
+-16
+>>> bin(~a)
+'-0b10000'
+>>> a | ~0b1111
+-1
+>>> bin(a & 0b1011)
+'0b1011'
+>>> a = -16
+>>> bin(a & -ob10100)
+Traceback (most recent call last):
+  File "<pyshell#50>", line 1, in <module>
+    bin(a & -ob10100)
+NameError: name 'ob10100' is not defined
+>>> bin(a & -0b10100)
+'-0b100000'
+>>> bin(a)
+'-0b10000'
+>>> bin(-1)
+'-0b1'
+>>> bin(a ^ -1)
+'0b1111'
+>>> (a ^ -1) == (a * -1 + -1)
+True
+>>> (a << 2 ) == (a / 4)
+False
+>>> a / 4
+-4.0
+>>> (a << 2) == (a //4)
+False
+>>> (a >> 2 ) == (a // 4)
+True
+>>> (a >> 2 ) == (a / 4)
+True
+>>>