Python basic learning code-function and functional programming

Python basic learning code-function and functional programming

def func1():    print 'hello world'res = func1()print type(res)def func2():    return ['xyz',10000,-98]atuple = func2()x,y,z = func2()print x,y,zdef func3():    return 'xyz',1000,-98x,y,z = func3()print x,y,zdef func4():    return ['xyz',1000,-98,'xxx']x,y,z,d = func4()alist = x,y,z,dprint alisttrue = lambda :Trueprint true()sum = lambda x,y:x + ysumm = lambda x,y=4:x + yatuplet = lambda *zaz:zazprint atuplet('a',1)adictt = lambda **z:zprint adictt(x=3,y=5)from random import randintdef functest(arg):    return arg % 2allnums = []for eachnum in range(9):    allnums.append(eachnum)print filter(functest,allnums)allnums = []for eachnum in range(9):#    print eachnum    ra = randint(1,99)#    print ra    allnums.append(ra)#print filter(lambda x:x%2,allnums)#print [i for i in allnums if i%2]print [n for n in [randint(1,99) for i in range(9)] if n%2]print map(lambda x:x+2,[i for i in range(9)])print map(lambda x:x**2,[int(i) for i in range(9)])print map(str,[i for i in range(9)])print map(lambda x,y:x+y,[1,2,3],[1,2,3])print map(lambda x,y:(x+y,x-y),[1,2,3],[1,2,3])print map(None,[1,2,3],[1,2,3])print reduce(lambda x,y:x+y,[i for i in range(3)])from operator import  mul,addfrom functools import partialadd1 = partial(add,1)mul100 = partial(mul,100)basetwo = partial(int,base=2)basetwo.__doc__ = 'convert base 2 string to an int'print basetwo('10010')import Tkinterroot = Tkinter.Tk()mybutton = partial(Tkinter.Button,root,fg='white',bg='blue')b1 = mybutton(text='button1')b2 = mybutton(text='button2')qb = mybutton(text='quit',bg='red',command=root.quit)b1.pack()b2.pack()qb.pack(fill=Tkinter.X,expand=True)root.title('pfas!')root.mainloop()is_this_global = 'xyz'def foo():    global is_this_global    this_is_local = 'abc'    is_this_global = 'def'    print this_is_local + is_this_globaldef foor():    m = 3    def bar():        n = 4        print m + n    print m    bar()def counter(start=0):    count = [start]    def incr():        count[0] += 1        return count[0]    return incrcount = counter()output = '
 
  'w = x = y = z = 1def f1():    x = y = z = 2def f2():    y = z = 3    def f3():        z = 4        print output%('w',id(w),w)        print output%('x',id(x),x)        print output%('y',id(y),y)        print output%('z',id(z),z)    clo = f3.func_closure    if clo:        print 'f3 closure vars:',[str(c) for c in clo]    else:        print 'no f3 closure vars'    f3()    clo = f2.func_closure    if clo:        print 'f2 closure vars:',[str(c) for c in clo]    else:        print 'no f2 closure vars'    f2()    clo = f1.func_closure    if clo:        print 'f1 closure vars:',[str(c) for c in clo]    else:        print 'no f1 closure vars'from time import timedef logged(when):    def log(f,*args,**kargs):        print '''called:function:%sargs:%skargs:%s'''%(f,args,kargs)    def pre_logged(f):        def wrapper(*args,**kargs):            log(f,*args,**kargs)            return f(*args,**kargs)        return wrapper    def post_logged(f):        def wrapper(*args,**kargs):            now = time()            try:                return f(*args,**kargs)            finally:                log(f,*args,**kargs)                print 'time delta:%s' % (time()-now)        return wrapper    try:        return {'pre':pre_logged,'post':post_logged}[when]    except KeyError,e:        raise ValueError(e),"must be 'pre' or 'post'"@logged('post')def hello(name):    print 'hello,',namehello('world!')x = 10def ffoo():    y = 5    bar = lambda z:x+z    print bar(y)j,k = 1,2def proc1():    j,k = 3,4    print 'j==%d and k==%d'  % (j,k)def proc2():    j = 6    proc1()    print 'j==%d and k==%d' % (j,k)k = 7proc1()print 'j==%d and k==%d' % (j,k)j = 8proc2()print 'j==%d and k==%d' % (j,k)def max2(arg1,arg2):    if arg1 > arg2:        return arg1    elif arg1 == arg2:        return 'equal'    else:        return arg2max22 = lambda a,b:a if a > b else bmin22 = lambda a,b:a if a < b else bdef heji(a,b):    return a+b,a*bx,y = heji(3,4)def mymin(a,b,*num):    minnum = min22(a,b)    for each in num:        minnum = min22(minnum,each)    return minnumdef mymax(a,b,*num):    maxnum = max22(a,b)    for each in num:        maxnum = max22(maxnum,each)    return maxnumtrantime = lambda m:(unicode(m / 60),unicode(m % 60))print ':'.join(trantime(80))a = ['jia','wo','ma']b = ['get','hoa','?']print map(None,a,b)print zip(a,b)def oddyear(y):    if (y % 4 == 0 and y % 100 != 0) or y % 400 == 0:        return yprint filter(oddyear,range(1999,2030))print [y for y in range(1999,2030) if (y % 4 == 0 and y % 100 != 0) or y % 400 == 0]print reduce(lambda x,y:x+y,range(6)) / float(6)cl = lambda x:x.strip()res = map(cl,open('e:\\thefile.txt'))import timedef timeit(arg):    starttime = time.clock()    result = arg    endtime = time.clock()    return (result,endtime-starttime)def arg(a,b):    return a * bprint timeit(arg(3,4))mult = lambda x,y:x * yprint reduce(mult,range(9)[1:])
 

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