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창소입2.txt

+엑셀 날짜 숫자로 바꿨을 때 1뺀게 맞음
+1900년 2월은 28일까지밖에 없다.
+
+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.
+>>> 2018-1900
+118
+>>> 118*365
+43070
+>>> 118 // 4
+29
+>>> 43070 + 29
+43099
+>>> 43099 + 31+ 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 +31+6
+43409
+>>> 118 // 100
+1
+>>> 400년마다 윤년.. (2000년)
+
+16진수나 8진수나 2진수로 바꾸는법(기말)
+16진수는 4개씩 묶어야됨
+
+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.
+>>> 118 % 100
+18
+>>> 118.4 % 100.6
+17.80000000000001
+>>> 118.4 // 100.6
+1.0
+>>> 118.4 - 100.6
+17.80000000000001
+>>> hex(2000)
+'0x7d0'
+>>> hex(3)
+'0x3'
+>>> oct(2000)
+'0o3720'
+>>> bin(2000)
+'0b11111010000'
+>>> 118.4 / 100.6
+1.1769383697813123
+>>> a = 255
+>>> hex(a)
+'0xff'
+>>> // 따옴표 꼭 써야함 (문자열)
+SyntaxError: invalid syntax
+>>> b=hex(a)
+>>> type(b)
+<class 'str'>
+>>> a
+255
+>>> b
+'0xff'
+>>> hex = 400
+>>> hex
+400
+>>> hex(400)
+Traceback (most recent call last):
+  File "<pyshell#18>", line 1, in <module>
+    hex(400)
+TypeError: 'int' object is not callable
+>>> 2**100
+1267650600228229401496703205376
+>>> 2//7
+0
+>>> 22/7
+3.142857142857143
+>>> import math
+>>> math.pi
+3.141592653589793
+>>> math.sin(math.pi)
+1.2246467991473532e-16
+>>> =0
+SyntaxError: invalid syntax
+>>> round(192384,-2)
+192400
+>>> a = 192384
+>>> (a//100) * 100
+192300
+>>> (a + 99) // 100 * 100
+192400
+>>> a + 50) // 100 * 100
+SyntaxError: invalid syntax
+>>> (a+50) // 100 * 100
+192400
+>>> 
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