"파이썬 입문"의 두 판 사이의 차이

2.1 리스트[편집]

>>> names = [ ]
>>> names = ['a', 'b', 'c', 'd, 'e']

>>> names = ['a', 'b', 'c', 'd, 'e']
>>> len(names)
5

>>> names = ['a', 'b', 'c', 'd, 'e']
>>> names[0]
'a'
>>> names[1]
'b'

>>> names = ['a', 'b','c']
>>> names.append('d')
>>> names
['a', 'b', 'c', 'd']

>>> names = ['a', 'b', 'c']
>>> names.insert(1, 'e')
>>> names
['a', 'e', 'b', 'c']

>>> data = [3, 4, 5]
>>> float_data = [float(d) for d in data]

2.2 튜플[편집]

>>> names = ('a', 'b', 'c', 'd, 'e')

>>> names = ('a', 'b', 'c', 'd, 'e')
>>> len(names)
5

>>> names = ('a', 'b', 'c', 'd, 'e')
>>> names[0]
'a'
>>> names[1]
'b'

2.3 딕셔너리[편집]

>>> cur_price = { }

>>> cur_price['samsung'] = 10000
>>> cur_price
{'samsung': 10000}

>>> cur_price['samsung']
>>> 10000

>>> del cur_price['samsung']
>>> cur_price{}

>>> cur_price.keys()
dict_keys(['samsung'])
>>> cur_price.values()
dict_values([10000])

3.1 len(s)[편집]

>>> mystring = "hello world"
>>> len(mystring)
11

3.2 indexing[편집]

>>> mystring[0]
'h'

3.3 slicing[편집]

>>> mystring[0:5]
'hello'

>>> mystring[6:]
'world'

3.4 문자열.split(S)[편집]

>>> companies = "yahoo google"

>>> companies.split(' ')
['yahoo', 'google']

3.5 in[편집]

>>> 'google' in companies
True

3.6 combining[편집]

>>> s1 = "hello"
>>> s2 = "world"
>>> s3 = s1 + ' ' + s2
>>> s3
"hello world"

3.7 replace[편집]

>>> a = "yahoo;google"
>>> new_a = a.replace(';', '-')
>>> new_a
"yahoo-google"

3.8 index[편집]

>>> s = "yahoo google"
>>> s.index("google")
6

3.9 문자열.find(x)[편집]

>>> s = "yahoo google"

>>> s.find("google")
6

3.10 stripping[편집]

>>> a = "  yahoo  "
>>> new_a = a.strip()
>>> new_a
"yahoo"

4.1 조건별 분기[편집]

if ending_price > 10000:
    print("sell")
elif ending_price < 8000:
    print("buy")
else:
    print("hold")

4.2 반복 처리[편집]

• Loop – For

>>> for i in range(0, 5):
        print(i)

0
1
2
3
4

>>> for i in range(0, 5):
        if i % 2 == 0:
            print(i, end=' ')
0, 2, 4
>>> buy_list = ['000660', '039490']
>>> for code in buy_list:
        print("buy", code)

buy 000660
buy 039490
>>> hold_list = {'naver': 10, 'samsung': 20}
>>> for company, num in hold_list.items():
        print(company, num)

naver 10
samsung 20

4.3 Loop - While[편집]

>>> i = 0
>>> while i < 5:
        print(i)
        i += 1

0
1
2
3
4
>>> i = 0
>>> while i < 5:
        if i % 2 == 0:
print(i)
        i += 1

0 2 4

9.1 인스턴스 메소드[편집]

class Joe:
    def callme(self):
        print("calling 'callme' method with instance")

thisjoe = Joe() #인스턴스 할당
thisjoe.callme() #메소스 호출

9.2 클래스 정의[편집]

class BusinessCard:
    def __init__(self, name, email):
        self.name = name
        self.email = email

    def print_info(self):
        print(self.name)
        print(self.email)
# instantiation and call the method
mem1 = BusinessCard("Goo", "goo@gmail.com")
mem1.print_info()

9.3 클래스 상속[편집]

• Class – Inheritance

>>> class Parent:
        def can_sing(self):
            print("sing a song")

>>> father = Parent()
>>> father.can_sing()
sing a song


>>> class LuckyChild(Parent):
        pass

>>> child1 = LuckyChild()
>>> child1.can_sing()
sing a song

>>> class LuckyChild2(Parent):
       def can_dance(self):
          print("dance beautifully")

>>> child2 = LuckyChild2()
>>> child2.can_sing()
sing a song
>>> child2.can_dance()
dance beautifully

9.4 클래스 상속2[편집]

• Class – Inheritance II

>>> class Parent:
        def __init__(self):
            self.money = 10000
        
>>> class Child1(Parent):
        def __init__(self):
            super().__init__()        

>>> class Child2(Parent):
        def __init__(self):
            pass
    
>>> child1 = Child1()
>>> child2 = Child2()
>>> print(child1.money)
10000
>>> print(child2.money)
AttributeError: 'Child2' object has no attribute 'money'