Python: control statement

scope=[1,2,3]
for x in scope
   print(x)
   break
else:
   print("Perfect")

Output:
1

break를 지우면,
Output:
1
2
3
Perfect


while condition:
   repeating_code
   continue   # return to while condition
   ...
   break       # exit while condition

Python: tips for variables

키워드를 변수로 사용 : SyntaxError
키워드 확인
>>> import keyword
>>> keyword.kwlist

module 이름을 변수로 사용: 모듈사용못함, 하면 TypeError
>>> abs=1 # now abs type is 'int'
# How to use abs() function?

>>> abs = 1
>>> type(abs)
<type 'int'>         # abs is int variable
>>> abs(-2)        # TypeError

Traceback (most recent call last):
  File "<pyshell#137>", line 1, in <module>
    abs(-2)
TypeError: 'int' object is not callable
>>> del abs       # delete int variable; remain internal function abs()
>>> type(abs)
<type 'builtin_function_or_method'>
>>> abs(-2)
2
>>>

Python: calling a class/method with parenthesis vs. no-parenthesis? whats the diff?

calling a class/method with parenthesis vs. no-parenthesis? whats the diff?

>>> class Service:

secret = "He is a alian."

def setname(self, name):

self.name=name

def sum(self,a,b):

print "{}, {}+{} = {}".format(self.name,a,b,a+b)

code source: https://wikidocs.net/28

aman = Service()

awoman = Service

>>> type(aman)

<type 'instance'>

>>> type(awoman)

<type 'classobj'>

>>> 

classobj can assign a instance.

>>> kim=awoman()

>>> type(kim)

<type 'instance'>

>>> aman.setname("Strong")

>>> awoman.setname("Beauty")

Traceback (most recent call last):

  File "<pyshell#58>", line 1, in <module>

    awoman.setname("Beauty")

TypeError: unbound method setname() must be called with Service instance as first argument (got str instance instead)

>>>