分类：python

#!/usr/bin/env python

eval_code = compile("100 + 200", "", "eval")

print eval(eval_code)

single_code = compile("print 'Hello World'", '', "single")

exec single_code

exec_code = compile("""

req = input('Count how many numbers?')

for eachNum in range(req):

    print eachNum

            """, '','exec')

exec exec_code

#! /usr/bin/env python

def foo():

    return True

def bar():

    'bar() does not much'

    return True

foo.__doc__ = 'foo() does not do much'

foo.tester = '''

if foo():

    print 'PASSED'

else:

    print 'FAILED'

'''

for eachAttr in dir():

    obj = eval(eachAttr) #convert the string to the object

    if isinstance(obj, type(foo)):

        if hasattr(obj, '__doc__'):

            print '\n Function "%s" has a doc string:\n\t%s' %(eachAttr, obj.__doc__)

        if hasattr(obj, 'tester'):

            print 'Function "%s" has a tester...executing ' %eachAttr

            exec obj.tester #to execute the strings

        else:

            print 'Funciton "%s" has no tester...skipping' %eachAttr

    else:

        print '"%s" is not a Function' %eachAttr

print '________________dir()__________________'

print dir()

class myClass(object):

    def __init__(self):

        self.foo = 100

myInst = myClass()

print hasattr(myInst, 'foo')

print getattr(myInst, 'foo')

print hasattr(myInst, 'bar')

#print getattr(myInst, 'bar')

print getattr(myInst, 'bar', 'oooops')

setattr(myInst, 'bar', 'my attr')

print getattr(myInst,'bar')

print dir(myInst)

print getattr(myInst,'bar')

delattr(myInst, 'foo')

print dir(myInst)

def simpleGen():

    yield 1

    yield '2--->punch!'

myG = simpleGen()

'''

myG.next()

myG.next()

myG.next() #Exception

'''

for eachItem in simpleGen():

    print eachItem,

print '-----------------------------------------'

from random import randrange

def randGen(aList):

    while len(aList) > 0:

        yield aList.pop(randrange(len(aList)))# Just like list.pop() and random.choice()

for item in randGen(['rock', 'paper', 'scissors']):

    print item

import longmodulename

short = longmodulename

del longmodulename

from cgi import FieldStorage as form

with open('/etc/passwd','r') as f:

    for eachLine in f:

        print eachLine,