python 기초 #2 : Data-type(자료형)

INTRO

python 기본 구성요소 숫자, 문자열, 리시트(list), 튜플(tuple), 딕셔너리(dictionary)

1. int(), float(), str(), bool()

2. list(), tuple(), dic()

 

1. Data-type : int(), float(), str(), bool()

- 숫자(Number) : 정수형/실수형, int()/float()

- 문자열(String) : str(), + 연산 or join() 함수 등 문자열을 합칠 수 있음

- 불(bool or boolean) : True/False, bool(), 제어문에서 활용

                                     숫자 0은 False 나머지는 True, 빈 문자열 False 나머지는 True

 

 

python code : test3.py

#### int(), float()
a = 10			# int 정수
b = 2.63		# float 실수
c = int(10)		# 정수화
d = int(a)		# 정수화
e = int(b)		# 정수화 float -> int
f = float(a)	# 실수화 int -> float
g = float(b)	# 실수화

print('''
	a = {}\n\tb = {}\n\tc = {}\n\td = {}\n\te = {}\n\tf = {}\n\tg = {}
	'''.format(a,b,c,d,e,f,g))

print('''
	Data-type of a is {}
	Data-type of b is {}
	Data-type of c is {}
	Data-type of d is {}
	Data-type of e is {}
	Data-type of f is {}
	Data-type of g is {}
	'''.format(type(a),type(b),type(c), \
		type(d),type(e),type(f),type(g)))	# \ 긴 code 행바꿈


#### str(), bool()
x = 0		
y = 1
z = 2
X = ''
Y = '0'
Z = 'a'

print('''
	x = {}\n\ty = {}\n\tz = {}\n\tX = {}\n\tY = {}\n\tZ = {}
	Z + Y = {}
	str(x) = {}
	'''.format(x,y,z,X,Y,Z,Z+Y,str(x)))	# Z+Y 문자열 합치기, str(x) int -> str

print('''
	Data-type of x is {}
	Data-type of y is {}
	Data-type of z is {}
	Data-type of X is {}
	Data-type of Y is {}
	Data-type of Z is {}
	Data-type of str(x) is {}
	'''.format(type(x),type(y),type(z), \
		type(X),type(Y),type(Z),type(str(x))))	# str(x) int -> str 변환

print('''
	boolean value of x is {}
	boolean value of y is {}
	boolean value of z is {}
	boolean value of X is {}
	boolean value of Y is {}
	boolean value of Z is {}
	boolean value of str(x) is {}
	'''.format(bool(x),bool(y),bool(z), \
		bool(X),bool(Y),bool(Z),bool(str(x))))	# str(x) False -> True

 

---- SublimeText python Run test3.py ----

	a = 10
	b = 2.63
	c = 10
	d = 10
	e = 2
	f = 10.0
	g = 2.63
	

	Data-type of a is <class 'int'>
	Data-type of b is <class 'float'>
	Data-type of c is <class 'int'>
	Data-type of d is <class 'int'>
	Data-type of e is <class 'int'>
	Data-type of f is <class 'float'>
	Data-type of g is <class 'float'>
	

	x = 0
	y = 1
	z = 2
	X = 
	Y = 0
	Z = a
	Z + Y = a0
	str(x) = 0
	

	Data-type of x is <class 'int'>
	Data-type of y is <class 'int'>
	Data-type of z is <class 'int'>
	Data-type of X is <class 'str'>
	Data-type of Y is <class 'str'>
	Data-type of Z is <class 'str'>
	Data-type of str(x) is <class 'str'>
	

	boolean value of x is False
	boolean value of y is True
	boolean value of z is True
	boolean value of X is False
	boolean value of Y is True
	boolean value of Z is True
	boolean value of str(x) is True
	

***Repl Closed***

 

 

2. Data-type collection(자료형 집합) : list(), tuple(), dic()

- 리스트(list) : 숫자, 문자 등의 자료형이나 객체들의 순서가 있는 집합

- 튜플(tuple) : 리스트와 유사하나 변경할 수 없는 자료형

- 딕셔너리(dictionary) : 고유식별자(key, 키)와 일대일(1:1) 쌍을 이루는 정보(value, 값)로 구성된 리스트

 

python code : test4.py

#### list(), tuple(), dic()
a = [0,1,2,3,str(0),bool(0)]
b = [0,1,2,3]
c = list(range(4))				# 리스트화, range(4)는 0~3
d = list(range(0,10,2))			# range(4)는 0~10 interval 2
e = ['a','b','c']				# 문자열
f = [a,b,[c]]					# 변수(객체) a를 가져옴

g = (0,1,2,3)
h = ('a',c,d)					# 문자열, 객체 c,d 가져옴
i = tuple(range(4))				# 튜플화
j = tuple(a)					# list -> tuple

k = {'file_name':'test', 'tail_name':4, 'extension':'.py'}
l = {'user1':('id1','pass1','name1'),'user2':('id2','pass2','name2')}
m = k.keys()
n = k.values()
o = k.items()
p = l.get('user1')				# key에 해당하는 value 얻기

print('''
	a = {}\n\tb = {}\n\tc = {}\n\td = {}\n\te = {}\n\tf = {}\n
	g = {}\n\th = {}\n\ti = {}\n\tj = {}\n\n\tk = {}\n\tl = {}
	'''.format(a,b,c,d,e,f,g,h,i,j,k,l))

print('''
	Data-type of a is {}
	Data-type of b is {}
	Data-type of c is {}
	Data-type of d is {}
	Data-type of e is {}
	Data-type of f is {}\n
	Data-type of g is {}
	Data-type of h is {}
	Data-type of i is {}
	Data-type of j is {}\n
	Data-type of k is {}
	Data-type of l is {}
	'''.format(type(a),type(b),type(c),type(d),type(e),type(f), \
		type(g),type(h),type(i),type(j),type(k),type(l)))	# \ 긴 code 행바꿈

#### dic() handle
print('dic k info. \n{}\n{}\n{}\n\n'.format(m,n,o))
print('Data-types of dic k info. \nkeys = {}\nvalues = {}\nitems = {}\n\n'.format(type(m),type(n),type(o)))

print('user1 info. {}'.format(p))
print('Data-types of user1 info. {}'.format(type(p)))

 

---- SublimeText python Run test4.py ----

	a = [0, 1, 2, 3, '0', False]
	b = [0, 1, 2, 3]
	c = [0, 1, 2, 3]
	d = [0, 2, 4, 6, 8]
	e = ['a', 'b', 'c']
	f = [[0, 1, 2, 3, '0', False], [0, 1, 2, 3], [[0, 1, 2, 3]]]

	g = (0, 1, 2, 3)
	h = ('a', [0, 1, 2, 3], [0, 2, 4, 6, 8])
	i = (0, 1, 2, 3)
	j = (0, 1, 2, 3, '0', False)

	k = {'file_name': 'test', 'tail_name': 4, 'extension': '.py'}
	l = {'user1': ('id1', 'pass1', 'name1'), 'user2': ('id2', 'pass2', 'name2')}
	

	Data-type of a is <class 'list'>
	Data-type of b is <class 'list'>
	Data-type of c is <class 'list'>
	Data-type of d is <class 'list'>
	Data-type of e is <class 'list'>
	Data-type of f is <class 'list'>

	Data-type of g is <class 'tuple'>
	Data-type of h is <class 'tuple'>
	Data-type of i is <class 'tuple'>
	Data-type of j is <class 'tuple'>

	Data-type of k is <class 'dict'>
	Data-type of l is <class 'dict'>
	
dic k info. 
dict_keys(['file_name', 'tail_name', 'extension'])
dict_values(['test', 4, '.py'])
dict_items([('file_name', 'test'), ('tail_name', 4), ('extension', '.py')])


Data-types of dic k info. 
keys = <class 'dict_keys'>
values = <class 'dict_values'>
items = <class 'dict_items'>


user1 info. ('id1', 'pass1', 'name1')
Data-types of user1 info. <class 'tuple'>

***Repl Closed***