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LectureNote-7.py

+Python 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 03:13:28) 
+[Clang 6.0 (clang-600.0.57)] on darwin
+Type "help", "copyright", "credits" or "license()" for more information.
+>>> def hello():
+	print("hello world!")
+
+	
+>>> hello()
+hello world!
+>>> def abs(arg):
+	if(arg<0):
+		result = arg*-1
+	else:
+		result = arg
+	return result
+
+>>> value=abs(10)
+>>> value
+10
+>>> value =abs(-100)
+>>> value
+100
+>>> def print_string(text,count):
+	for i in range(count):
+		print(text)
+
+		
+>>> print_string("hi",5)
+hi
+hi
+hi
+hi
+hi
+>>> def print_string(text,count=1):
+	for i in range(count):
+		print(text)
+
+		
+>>> #위의 함수를 호출할때 count값을 정해주지 않으면 자동으로 1로 할당된다.
+>>> print_string('hi',3)
+hi
+hi
+hi
+>>> print_string('hi')
+hi
+>>> def merge_string(*text_list):
+	result = ''
+	for s in text_list:
+		result= result + s
+		return result
+
+	
+>>> merge_string('father','go','room')
+'father'
+>>> def merge_string(*text_list):
+	
+	for s in text_list:
+		result= result + s
+		return result
+
+	
+>>> merge_string('father','go','room')
+Traceback (most recent call last):
+  File "<pyshell#36>", line 1, in <module>
+    merge_string('father','go','room')
+  File "<pyshell#35>", line 4, in merge_string
+    result= result + s
+UnboundLocalError: local variable 'result' referenced before assignment
+>>> def merge_string(*text_list):
+	result=''
+	for s in text_list:
+		result= result + s
+		return result
+
+	
+>>> merge_string('아버지가','방에','들어가신다.')
+'아버지가'
+>>> def merge_string(*text_list):
+        result = ''
+        for s in text_list:
+                result = result + s
+        return result
+
+>>> merge_string('father','goto','room')
+'fathergotoroom'
+>>> #return의 위치 중요
+>>> def print_team(**players):
+	for k in players.key():
+		print('{0} = {1}'.format(k,players[k]))
+
+		
+>>> print_team(k='gk', r = 'fw', a= 'mf, p = 'df')
+	       
+SyntaxError: invalid syntax
+>>> print_team(k='gk', r = 'fw', a= 'mf', p = 'df')
+	       
+Traceback (most recent call last):
+  File "<pyshell#48>", line 1, in <module>
+    print_team(k='gk', r = 'fw', a= 'mf', p = 'df')
+  File "<pyshell#46>", line 2, in print_team
+    for k in players.key():
+AttributeError: 'dict' object has no attribute 'key'
+>>> def print_team(**players):
+	for k in players.keys():
+		print('{0} = {1}'.format(k,players[k]))
+
+	       
+>>> print_team(k='gk', r = 'fw', a= 'mf', p = 'df')
+	       
+k = gk
+r = fw
+a = mf
+p = df
+>>> def print_args(*argv,argc):
+	       for i in range(argc):
+	       print(argv[i])
+	       
+SyntaxError: expected an indented block
+>>> def print_args(*argv,argc):
+	       for i in range(argc):
+		       print(argv[i])
+
+	       
+>>> print_args("a","b","c",argc=3)
+	       
+a
+b
+c
+>>> print_args("a","b","c",argc=2)
+	       
+a
+b
+>>> #가변 매개변수와 일반 매개변수를 모두 사용할때는 일반매개변수가 가변매개변수 뒤에 와야한다.
+	       
+>>> def multiply(a,b):
+	       return a*b
+
+	       
+>>> result = multiply(2,3)
+	       
+>>> result
+	       
+6
+>>> def my_abs(arg):
+	if arg<0:
+	       return arg*-1
+	else:
+	       return arg
+
+	       
+>>> result = my_abs(-50)
+	       
+>>> result
+	       
+50
+>>> result = my_abs(50)
+	       
+>>> result
+	       
+50
+>>> #none을 반환하는 경우
+	       
+>>> def my_abs(arg):
+	if arg<0:
+	       return arg*-1
+	elif arg>0:
+	       return arg
+
+	       
+>>> result = my_abs(0)
+	       
+>>> result
+	       
+>>> result == None
+	       
+True
+>>> type(result)
+	       
+<class 'NoneType'>
+>>> def ogamdo(num):
+	for i in range(1,num+1):
+	       print("the {0}'s ahae".format(i))
+	       if i==5:
+		       return
+
+	       
+>>> ogamdo(5)
+	       
+the 1's ahae
+the 2's ahae
+the 3's ahae
+the 4's ahae
+the 5's ahae
+>>> ogamdo(8)
+	       
+the 1's ahae
+the 2's ahae
+the 3's ahae
+the 4's ahae
+the 5's ahae
+>>> #위의 return은 함수 종료의 의미로 사용되었다.
+	       
+>>> def print_something(*args):
+	for s in args:
+	       print(s)
+
+	       
+>>> print_something(1,2,3)
+	       
+1
+2
+3
+>>> print_something(1,2,3,4,5)
+	       
+1
+2
+3
+4
+5
+>>> #함수 밖의 변수와 함수 안의 변수
+	       
+>>> def scope_test():
+	       a=1
+	       print('a:{0}'.format(a))
+
+	       
+>>> a=0
+	       
+>>> scope_test()
+	       
+a:1
+>>> print(a)
+	       
+0
+>>> #함수안에서의 a는 1이지만 밖에서는 0 이다.
+	       
+>>> def scope_test():
+	global a
+	a=1
+	print('a:{0}'.format(a))
+
+	       
+>>> a=0
+	       
+>>> scope_test()
+	       
+a:1
+>>> print(a)
+	       
+1
+>>> #재귀함수
+	       
+>>> def factorial(n):
+	if n == 0:
+	       return 1
+	elif n>0:
+	       return factorial(n-1)*n
+
+	       
+>>> factorial(5)
+	       
+120
+>>> factorial(10)
+	       
+3628800
+>>> 
+	       
+>>>