lecture note4-operation.py

Python 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 03:13:28) 
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license()" for more information.
>>> 
============= RESTART: /Users/kimminsub/Documents/HELLO_WORLD.py =============
HELLO, WORLD.
>>> #이것은 주석입니다.
>>> a=2020
>>> a
2020
>>> b= a+3030
>>> b
5050
>>> a=3
>>> b=123456789
>>> c=123456789012345678901234567890
>>> a
3
b
>>> 
>>> c
123456789012345678901234567890
d
>>> a
3
>>> b
123456789
>>> c
123456789012345678901234567890
>>> d
Traceback (most recent call last):
  File "<pyshell#14>", line 1, in <module>
    d
NameError: name 'd' is not defined
>>> d= -12345678901234567890123456789012345677890
>>> d
-12345678901234567890123456789012345677890
>>> e=-123456789
>>> e
-123456789
>>> f=-3
>>> 
>>> f
-3
>>> type(f)
<class 'int'>
>>> type(d)
<class 'int'>
>>> type(e)
<class 'int'>
>>> a= 3+4
>>> a
7
>>> b=7-10
>>> b
-3
>>> c=7*-3
>>> c
-21
>>> d=30//7
>>> d
4
>>> e= 30%7
>>> e
2
>>>