python核心編程第十一章練習

11-4

def time_in_minues(minues):
    print '%d minues' % minues
    def minues2h_and_m():
        minue = minues % 60
        hours = minues // 60
        return '%d : %d' % (hours, minue)
    return minues2h_and_m

time = time_in_minues(601)
print time()

11-7

print map(None, [1,2,3],['abc','def','ghi'])
print zip([1,2,

11-8

print filter(lambda year: year % 4 == 0 and year % 100 != 0 or year % 400 == 0,
             [year for year in range(1900, 2016)]) 

print [year for year in range(1900, 2016) if year % 4 == 0 
             and year % 100 != 0 or year % 400 == 0]

11-9

def average(num):
	return reduce((lambda x, y: x + y), range(num+1))/num

print average(5)

11-11

def create(filename):
    f = open(filename, 'r')
    nf = open('newfile.txt', 'w')
    flines = [line.strip() for line in f]
    for line in flines:
        nf.write(line)
        nf.write('\n')
    f.close()
    nf.close()


def overwrite(filename):
    f = open(filename, 'r')
    flines = [line.strip() for line in f]
    f.close()
    f = open(filename, 'w')
    for line in flines:
        f.write(line)
        f.write('\n')
    f.close()

choice = raw_input('create file or overwrite file: ')[0].strip().lower()
filename = raw_input('filename: ')
if choice == 'c':
    create(filename)
if choice == 'o':
    overwrite(filename)

11-12

import time


def timeit(func, *args, **kwargs):
    try:
        start = time.clock()
        retval = func(*args, **kwargs)
        end = time.clock()
        result = (True, retval, end - start)
    except Exception, diag:
        result = (False, str(diag))
    return result


def test():
    funcs = (int, long, float)
    vals = (1234, 12.34, '1234', '12.34')

    for eachFunc in funcs:
        print '_' * 20
        for eachVal in vals:
            retval = timeit(eachFunc, eachVal)
            if retval[0]:
                print '%s(%s) cost %f seconds' % (eachFunc.__name__, eachVal, retval[2])
            else:
                print '%s(%s)=FAILED: ' % (eachFunc.__name__, eachVal), retval[1]

test()

11-13

from fatorial import *
import math, time 


def timeit(func, *args, **kwargs):
    try:
        start = time.clock()
        retval = func(*args, **kwargs)
        end = time.clock()
        result = (True, retval, end - start)
    except Exception, diag:
        result = (False, str(diag))
    return result


def test():
    funcs = (factorial1, factorial2, factorial3, math.factorial)
    vals = range(521, 531)

    for eachFunc in funcs:
        print '_' * 40
        for eachVal in vals:
            retval = timeit(eachFunc, eachVal)
            if retval[0]:
                print '%s(%s) cost %f seconds' % (eachFunc.__name__, eachVal, retval[2])
            else:
                print '%s(%s)=FAILED: ' % (eachFunc.__name__, eachVal), retval[1]

test()

11-14

def fibonacci(n):
    if n == 1 or n == 2:
        return 1
    else:
        return (fibonacci(n - 1) + fibonacci(n - 2))
print fibonacci(5)
print fibonacci(6)
print fibonacci(1)

11-15

def func(string, i = 0):
    lens = len(string)-1
    if i == 0:
        print string[i]
        func(string, i+1)
    elif i == lens:
        print string[i]
    else:
        print string[i-1], string[i+1] 
        func(string, i+1)

func('string')

11-16

from operator import add, sub, mul, div
from random import randint, choice

ops = {'+': add, '-': sub, '*': mul, '/': div}
MAXTRIES = 2

def doprob():
    op = choice('+-*/')
    nums = [randint(1, 100) for i in range(2)]
    nums.sort(reverse=True)
    ans = ops[op](*nums)
    pr = '%d %s %d=' % (nums[0], op, nums[1])
    oops = 0
    while True:
        try:
            if int(raw_input(pr)) == ans:
                print 'correct'
                break
            if oops == MAXTRIES:
                print 'answer\n%s%d' % (pr, ans)
            else:
                print 'incorrect...try again'
        except (KeyboardInterrupt, EOFError, ValueError):
            print 'invalid input...try again'

def main():
    while True:
        doprob()
        try:
            opt = raw_input('Again? [y]').lower()
            if opt and opt[0] == 'n':
                break
        except (KeyboardInterrupt, EOFError):
            break

main()

11-18

person = ['name',['savings',100.00]]  
hubby = person[:]  
wifey = list(person)  
hubby[0] = 'joe'  
wifey[0] = 'jane'  
  
def count():  
    def person_cost(f):  
        def wrapper(*args,**kargs):  
            def cost(f,*args,**kargs):  
                if len(args) != 2:  
                    print 'paras num error'  
                elif args[0] == 'joe':  
                    hubby[1][1] -= args[1]  
                    print hubby,wifey,person  
                elif args[0] == 'jane':  
                    wifey[1][1] -= args[1]  
                    print hubby,wifey,person  
                else:  
                    print 'paras error'   
            return f(*args,**kargs)  
        return wrapper  

 
@count 
def changehubby(name,money):  
    print 'change count of %s, minus %f' % (name,money)  
 
@count 
def changewifey(name,money):  
    print 'change count of %s, minus %f' % (name,money)  
  
changehubby('joe',10.0)  
changewifey('jane',20.0)