Class

Class        class A
Object       a =
Instance       = A()
class (static) variable
Instance varialbe in the __init__(self)
__private
_protected
public static variable
def __init__(self):
instance variable
import module
from module import function
comments
To help you and your team to make your code more readable and maintainable.

#Single line comment
“””
    Multiline comment
“””

Common Tags:
@author Author of the program
@since Date released
@version Version of program
@param Parameter of a method
@return Return value for a method
= (assignment)
class BaseClass:
    pass
class DerivedClass( BaseClass ):
    pass
if __name__ == “__main__”:
    ….
Run it only when it’s the main
import sys
args = sys.argv[1:]
for i in args:
    print( int(i), end=’ ‘ )
print( sys.path )
1  Package 만들기
import openpyxl
wb            = openpyxl.Workbook()
ws            = wb.active
ws.title     = “Start Coding”
wb.save(‘autoexcel.xlsx’)
global a
a = 1
def test_function():
    global a
    a = a +1
test_function()
print(a)               # 2
def function_name( self ):
    var = ‘ ‘
    return var
Swap
a = 3
b = 5
a,b = b, a
(*args)
function( a, b, c, …. )
(**kwargs)
( name=””, value=””, …… )
( …., last = True )
def function(a, b):
    return a+b, a*b
(x, y)
return
add = lambda a, b: a+b
result = add(3,4)
a = [llambda a, b: a++b, lambda a, b: a*b]
print(a[1](3,4) )  #12
def function(a, b):
    return a+b, a*b
(x, y)
return
f =  open(“file1.txt”, ‘w’, encoding=”UTF-8″)
for i in range(1, 11):
    f.write(i)
f.close()
f =  open(“file1.txt”, ‘r’)
while True:
    line = f.readline()
    if not line: break
    print( line )
lines = f.readlines()
for line in lines:
    print( line )
data = f.read( )
print( data )
for line in f:
    print( line )
f.close()
with open(“file1.txt”, “w”) as f:
f.write(“”)
import sys
args = sys.argv[1:]
for i in args:
    print( int(i), end=’ ‘ )
PS F:\cs\program\back_end\python\app\csapp> python .\index.py 1 2 3
1 2 3
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