4 + spam*3

a = 10
b = 0 
c = a / b

def division():
    for n in range(0, 5):
        print 10.0 / n

division()   

'2' + 2

l = [1, 2]
print l[2]

d = {"a": 1, "b": 2}
print d['c']

a = open('aaa.txt')

try:
    print 1.0 / 0.0
except ZeroDivisionError:
    print 'zero division error!!!'

def division():
    for n in range(0, 5):
        try:
            print 10.0 / n
        except ZeroDivisionError, msg:
            print msg

division()        

def division():
    for n in range(0, 5):
        try:
            print 10.0 / n
        else:
            print "Success"

division() 

name = 'aaa.txt'
try:
    f = open(name, 'r')
except IOError:
    print 'cannot open', name
else:
    print name, 'has', len(f.readline()), 'lines'
    f.close()

try:
    spam()
except NameError, msg:
    print 'Error - ', msg

try:
    spam()
except NameError as msg:
    print 'Error - ', msg

def zero_division():
    x = 1 / 0

try:
    zero_division()
except ZeroDivisionError, msg:
    print 'zero division error!!! - ', msg

def zero_division():
    x = 1 / 0

try:
    zero_division()
except ZeroDivisionError as msg:
    print 'zero division error!!! - ', msg

try:
    spam()
    print 1.0 / 0.0
except:
    print 'Error'

b = 0.0
name = 'aaa.txt'
try:
    print 1.0 / b
    spam()
    f = open(name, 'r')
    '2' + 2
except NameError:
    print 'NameError !!!'
except ZeroDivisionError:
    print 'ZeroDivisionError !!!'
except (TypeError, IOError):
    print 'TypeError or IOError !!!'
else:
    print 'No Exception !!!'
finally:
    print 'Exit !!!'

import os
print os.getcwd()
filename = 't.txt'

try:
    f = open(filename, 'r')
except IOError, msg:
    print msg
else:
    a = float(f.readline())
    try:
        answer = 1.0 / a
    except ZeroDivisionError, msg:
        print msg
    else:
        print answer
    finally:
        print "Finally!!!"
        f.close()

def dosomething():
    a = 1/0

try:
    dosomething()
except ArithmeticError:
    print "ArithmeticException occured"

def dosomething():
    a = 1/0

try:
    dosomething()
except ZeroDivisionError:  # ZeroDivisionError는 이곳에서 잡힌다.
    print "ZeroDivisionError occured"
except ArithmeticError:    # FloatingPointError, OverflowError는 이곳에서 잡힌다.
    print "ArithmeticException occured"

def dosomething():
    a = 1/0

try:
    dosomething()
except ArithmeticError:
    print "ArithmeticException occured"
except ZeroDivisionError:  # 이곳에서 ZeroDivisionError는 잡히지 않는다. ==> 잘못된 코드
    print "ZeroDivisionError occured"    

for e in dir(__builtin__):
    if e.endswith('Error') or e.endswith('Warning'):
        print e

class SquareSeq:
    def __init__(self, n):
        self.n = n
    def __getitem__(self, k):
        if k >= self.n or k < 0 :
            raise IndexError # 첨자 범위를 벗어나면 IndexError 예외를 발생시킴
        return k * k
    def __len__(self):
        return self.n
    
s = SquareSeq(10)
print s[2], s[4]
for x in s:  # IndexError가 발생하는 시점까지 반복한다
    print x,
print s[20]  # 첨자 범위가 넘었다

class Big(Exception):
    pass

class Small(Big):
    pass

def dosomething1():
    x = Big()
    raise x
    
def dosomething2():
    raise Small()
    
for f in (dosomething1, dosomething2):
    try:
        f()
    except Big:
        print "Big Exception = ", Big

class MessageClass:
    def __init__(self, message, dur):
        self.message = message
        self.duration = dur
        
def f():
    raise Exception, 'message'
    
try:
    f()
except Exception, a:
    print a #에러발생

raise NameError

raise NameError('이름 예외')

a = 10
b = 0
try:
    if b == 0:
        raise ArithmeticError('0으로 나누고 있습니다.')
    a / b
except ArithmeticError, v:
    print v

a = 10
b = 0
try:
    if b == 0:
        raise ArithmeticError('0으로 나누고 있습니다.')
    a / b
except ArithmeticError as e:
    print e

# assert_test.py
a = 30
margin = 2 * 0.2
assert margin > 10, 'not enough margin %s' % margin
print a  # assert의 조건식이 거짓이 되어 print a는 수행되지 않는다.

a = 30
margin = 2 * 0.2
try:
    assert margin > 10, 'not enough margin %s' % margin
except AssertionError, msg:
    print msg

a = 30
margin = 2 * 0.2
if __debug__:
    assert margin > 10, 'not enough margin %s' % margin