pythonGrammar.txt

[list]
list = [1,2,3]
list.count(3)-1
list.index(3)-2
list.reverse()
list.clear()
list.extend([1,2]) - [1,2,3,1,2]
list.insert(1,5) - [1,1,2,3]
del list[1]-[1,3]
list.remove(1)-[2,3]
[1,2]+[3,4]-[1,2,3,4]
[1]*4-[1,1,1,1]
["hello","world].join(' ')-"hello world"

[tuple]
a=(1,2) a[0]=2 불가


[str]
str ="hello,world"
str.split(',')-['hello','world']
str.count('l')-3
str.capitalize()-"Hello,world"
"hello world".title()-"Hello World"
"hi   ".rstrip()-"hi"
"{0:5s}".format(str)
"{0:>5,.2%}".format
print("3".rjust(3))


[bool]
"hi".isdigit()
"hi".isalpha()
"hi".isalnum()
"hi".islower()
"hi".isupper()
"hi".isspace()


[set]
s1={"egg","hi"}, s2={"egg","bye"}
ss3 =set()
ss1.add('egg')-{"egg", "hi"}
ss1.discard('egg')-{"hi"}
ss1.clear()-{}
set([1,2])-{1,2}
s1.union(s2)-{"egg","hi","bye"}
s1.intersection(s2)-{"egg"}
s1.difference(s2)-{s1-s2}

[dict]
di = {1:'a' , 2:'b'}
len(di) -2
1 in di - true
di[1]='z' - {1:'z', 2:'b'}
di.get(3,'h')-'h'
di.keys() - [1,2]
di.items() - [(1,'a'), (2,'b')]
di.values() - ['a','b']
del di[1] - {2:'b'}
set(di) - key의 셋
tuple(di)- key의 튜플
list(di) - key의 리스트
di1.update(di2) di1우선

comprehension
file = [1,1,2,3]
[i*2 for i in file] - [2, 2, 4, 9]
{i*2 for i in file} - {2, 3, 9}
{i:i**2 for i in file} - {1:1, 2:4, 3:9}


[class]
class Rect:
	def __init__(self, height=1, width=2):
		self.height = height
		self.width = width
	def setWidth(self, width):
		self.width = width
	def __str__(self):
		return("width: "+str(self.width)+ "\nheight: ")

class Square(Rect):
	def __init__(self, height=2):
		self.height=height
		self.width=width

[pickle library]
file = open("input.dat","rb")
a = pickle.load(file)

file = open("result.dat","wb")
pickle.dump(a,file)

[random library]
random.choice([1,2,3,4,5]) - 1~5값 랜덤하게 리턴