┗System∑Sec†ion┛

>>> print 'Hello World!'

Hello World!

>>> print "Hello World!"

Hello World!

>>> s = "Hello World!"

>>> s[-2]

'd'

>>> s[1:3]

'el'

>>> s[0:5]

'Hello'

>>> s = 'Hello'

>>> s[1:]

'ello'

>>> s[:3]

'Hel'

>>> s = 'abcd'

>>> s[::2] # 2칸 단위로

'ac'

>>> s[::-1] # 거꾸로

'dcba'

>>> 'Hello' + ' ' + 'World'

'Hello World'

>>> 'Hello' * 3

'HelloHelloHello'

>>> '-' * 60

'------------------------------------------------------------'

>>> s = 'Hello World'

>>> s[0] = 'h'

Traceback (most recent call last):

File "<pyshell#16>", line 1, in <module>

s[0] = 'h'

TypeError: 'str' object does not support item assignment

>>> s = 'h' + s[1:]

>>> s

'hello World'

>>> L = [1,2,3] # 세개의 자료를 갖는 리스트

>>> len (L) # 데이터 개수

3

>>> L[1] # 두번째 자료. 옵셋은 0부터 시작함.

2

>>> L[-1] # 마지막 자료.

3

>>> L[1:3] # 슬라이싱

[2, 3]

>>> L * 3

[1, 2, 3, 1, 2, 3, 1, 2, 3]

>>> L = range(10)

>>> L

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

>>> L[::2] # 확장 슬라이스

[0, 2, 4, 6, 8]

>>> L[::-1] # 확장 슬라이스

[9, 8, 7, 6, 5, 4, 3, 2, 1, 0]

>>> L.append(4) # 리스트 마지막에 자료 추가

>>> L

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 4]

>>> del L[0] # 리스트 자료 삭제.

>>> L

[1, 2, 3, 4, 5, 6, 7, 8, 9, 4]

>>> L.reverse() # 리스트 순서를 거꾸로 바꾼다.

>>> L

[4, 9, 8, 7, 6, 5, 4, 3, 2, 1]

>>> L.sort() # 리스트를 오름 차순 정렬.

>>> L

[1, 2, 3, 4, 4, 5, 6, 7, 8, 9]

>>> t = (1,2,3)

>>> len(t)

3

>>> t[0]

1

>>> t[-1]

3

>>> t[0:2]

(1, 2)

>>> t[::2]

(1, 3)

>>> t + t + t

(1, 2, 3, 1, 2, 3, 1, 2, 3)

>>> t * 3

(1, 2, 3, 1, 2, 3, 1, 2, 3)

>>> t = (1,2,3)

>>> t[0] = 100

Traceback (most recent call last):

File "<pyshell#89>", line 1, in <module>

t[0] = 100

TypeError: 'tuple' object does not support item assignment

>>> L = [1,2,3]

>>> L[1] = 200

>>> L

[1, 200, 3]

>>> d = {'one':'hana', 'two':'dul', 'three':'set'}

>>> d

{'three': 'set', 'two': 'dul', 'one': 'hana'}

>>> d['one']

'hana'

>>> d['four'] = 'net'

>>> d

{'four': 'net', 'three': 'set', 'two': 'dul', 'one': 'hana'}

>>> d['one'] = 1

>>> d

{'four': 'net', 'three': 'set', 'two': 'dul', 'one': 1}

>>> d = {'one':1, 'two':'dul', 'three':'set', 'four':'net'}

>>> d.keys() # 키만 리스트로 출력.

['four', 'three', 'two', 'one']

>>> d.values() # 값만 리스트로 추출.

['net', 'set', 'dul', 1]

>>> d.items() # 키와 값의 튜플을 리스트로 변환.

[('four', 'net'), ('three', 'set'), ('two', 'dul'), ('one', 1)]

>>> k = int(raw_input('int : '))

int : 89

>>> k

89

>>> i = input('int : ')

int : 45

>>> i

45

>>> k = input('expr:')

expr: 30+50

>>> k

80

>>> k = input('expr:')

expr:k+1

>>>k

81

>>> print 4+5, 4-2

9 2

>>> print 1; print 2

1

2

>>> print 1,; print 2

1 2

>>> print 12 + 'spam' # 숫자와 문자열간에 + 연산은 없다.

Traceback (innermost last):

File "<pyshell#118>", line 1, in ?

print 12 + 'spam'

TypeError: number coercion failed

>>> print '12' + 'spam' # 숫자 12를 ''로 문자열로 변환한 후 공백업이 출력.

12spam

>>> import pprint # pprint를 사용하기 위해서 먼저 import 해야 한다.

>>> complicated = [ 'spam', (1, 2, 3), ('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w'))]

>>> complicated = complicated * 3

>> pprint.pprint(complicated)

['spam',

(1, 2, 3)

('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w')),

'spam',

(1, 2, 3)

('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w')),

'spam',

(1, 2, 3)

('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w'))]

>>> print complicated

['spam', (1, 2, 3), ('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w')), 'spam', (1, 2, 3), ('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w')), 'spam', (1, 2, 3), ('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w'))]

>>> import sys, pprint

>>> sys.displayhook = pprint.pprint

>>> complicated # 직접

['spam',

(1, 2, 3)

('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w')),

'spam',

(1, 2, 3)

('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w')),

'spam',

(1, 2, 3)

('unix', 'linux', ('w', 'i', 'n', 'd', 'o', 'w'))]

>>> a = 1

>>> a = eval('a + 4')

>>> a

5

>>> a = 5

>>> exec 'a = a + 4'

>>> a

9

>>> code = compile ('a + 1', '<string>', 'eval')

>>> a = 1

>>> for k in range(10):

a = eval(code)

>>> a

11

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Devanix ~ $  python --version

Python 2.7.10