파이썬의 Self

May 17, 2013Download as pptx, pdf

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This document contains code examples demonstrating the use of the "self" keyword in Python class methods. It defines a Vector class with x and y attributes and shows how to initialize an instance using self, call methods on an instance like length() using self, and why global variables cannot be used instead of instance attributes accessed via self.

$my’self’ class LeeSeongjoo: def __init__(self): self.name = u’이성주’ self.twitter = ‘@LeeSeongjoo’ self.interests = [u‘비디오 얼굴 인식’, u’로마 역사’, u’야구’] def feel_about_python(self): print(u’{} 는 파이썬을 좋아합니다.’.format(self.name)) def show_current_interests(self): print(‘n’.join(‘{}: {}’.format(*k) for k in enumerate(self.interests))) >>> sj = LeeSeongjoo()$

self?
class Vector:
def __init__(self, x, y):
self.x = x
self.y = y
>>> v = Vector(3, 4)

self? (help!)
class Vector:
def __init__(self, x, y):
self.x = x
self.y = y
>>> v = Vector(3)
TypeError: __init__() takes exactly 3
arguments (2 given)

def length(vector):
return math.sqrt(vector.x ** 2 + vector.y **2)
class Vector:
def __init__(self, x, y):
self.x = x
self.y = y
>>> v = Vector(3, 4)
>>> length(v)
5.0

def length(vector):
return math.sqrt(vector.x ** 2 + vector.y **2)
class Vector:
def __init__(self, x, y):
self.x = x
self.y = y
>>> v = Vector(3, 4)
>>> v.length = length
>>> v.length(v)
5.0

class Vector:
def __init__(self, x, y):
self.x = x
self.y = y
def length(self):
return math.sqrt(self.x ** 2 + self.y **2)
>>> v = Vector(3, 4)
>>> v.length()
5.0

global
self ?
class Vector:
xx = 3
yy = 4
def __init__(self, x, y):
xx = x
yy = y
def length(self):
return math.sqrt(xx ** 2 + yy **2)
>>> v = Vector(5, 12)
>>> v.xx
3
>>> v.yy
4
>>> v.length()
NameError: global name ‘xx’ is not defined
xx  3
yy  4
length
__init__
xx  3
yy  4
self.x
self.y
length
__init__

self? this?
class Vector:
def __init__(this, x, y):
this.x = x
this.y = y
def length(this):
return math.sqrt(this.x ** 2 + this.y **2)
>>> v = Vector(3, 4)
>>> v.length()
5.0
self는 파이썬 객체. 즉, 키워드가 아
니다.

>>> sj.say_thank_you()
>>> sj.take_questions()
>>> sj.exit()

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파이썬의 Self

1. self study 이성주 페이스북 파이썬 그룹 2013-05-18

2. my’self’ class LeeSeongjoo: def __init__(self): self.name = u’이성주’ self.twitter = ‘@LeeSeongjoo’ self.interests = [u‘비디오 얼굴 인식’, u’로마 역사’, u’야구’] def feel_about_python(self): print(u’{} 는 파이썬을 좋아합니다.’.format(self.name)) def show_current_interests(self): print(‘n’.join(‘{}: {}’.format(*k) for k in enumerate(self.interests))) >>> sj = LeeSeongjoo()

3. self? class Vector: def __init__(self, x, y): self.x = x self.y = y >>> v = Vector(3, 4)

4. self? (help!) class Vector: def __init__(self, x, y): self.x = x self.y = y >>> v = Vector(3) TypeError: __init__() takes exactly 3 arguments (2 given)

5. def length(vector): return math.sqrt(vector.x ** 2 + vector.y **2) class Vector: def __init__(self, x, y): self.x = x self.y = y >>> v = Vector(3, 4) >>> length(v) 5.0

6. def length(vector): return math.sqrt(vector.x ** 2 + vector.y **2) class Vector: def __init__(self, x, y): self.x = x self.y = y >>> v = Vector(3, 4) >>> v.length = length >>> v.length(v) 5.0

7. class Vector: def __init__(self, x, y): self.x = x self.y = y def length(self): return math.sqrt(self.x ** 2 + self.y **2) >>> v = Vector(3, 4) >>> v.length() 5.0

8. global self ? class Vector: xx = 3 yy = 4 def __init__(self, x, y): xx = x yy = y def length(self): return math.sqrt(xx ** 2 + yy **2) >>> v = Vector(5, 12) >>> v.xx 3 >>> v.yy 4 >>> v.length() NameError: global name ‘xx’ is not defined xx  3 yy  4 length __init__ xx  3 yy  4 self.x self.y length __init__

9. self? this? class Vector: def __init__(this, x, y): this.x = x this.y = y def length(this): return math.sqrt(this.x ** 2 + this.y **2) >>> v = Vector(3, 4) >>> v.length() 5.0 self는 파이썬 객체. 즉, 키워드가 아 니다.

10. >>> sj.say_thank_you() >>> sj.take_questions() >>> sj.exit()

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파이썬의 Self

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