2.迴圈。編寫一個程式，讓使用者輸入3個數字：(f)rom，(t)o 和 (i)ncrement。以i為步長，從f計數到t，包括f和t。例如，如果輸入的是f==2、t==26、i==4，程式將輸出2，6，10，14，18，22，26。

# -*- coding: utf-8 -*-

f = input()
t = input()
i = input()

for j in range(f,t+1,i):
    print j

4.素數。我們在本章已經給出了一些程式碼來確定一個數的最大約數或者他是否是一個素數。請把相關的程式碼轉換成一個返回值為布林值的函式，函式名為isprime()。如果輸入是一個素數，那麼返回True，否則返回False。

import math
def isprime(n):
    if n >= 2:
        for i in range(2,int(math.sqrt(n))+1):
            if n%i==0:
                return False
        else:
            return True
    else:
        return False

<pre name="code" class="python" style="font-size: 14px; line-height: 26px;">def getfactors(n):
    list =[]
    for i in range(1,n+1):
        if n%i ==0:
            list.append(i)
    return list
 

# -*- coding: utf-8 -*-
import math
def isprime(n):
    if n >= 2:
        for i in range(2,int(math.sqrt(n))+1):
            if n%i==0:
                return False
        else:
            return True
    else:
        return False
def getfactors(n):
    list =[]
    if n == 1:
        list.append(1)
    else:    
        while not isprime(n):        
            for i in range(2,n+1):
                if n%i ==0:
                    list.append(i)
                    n = n/i
                    break
                
        list.append(n)
            
    return list
if __name__ == '__main__':
    n = input()
    print getfactors(n)
 

def getfactors(n):
    list =[]
    sum =0
    for i in range(1,n):
        if n%i ==0:
            list.append(i)
            sum +=i
    if sum==n:
        return True
    else:
        return False

def jiecheng(n):
    num = 1
    for i in range(1,n+1):
        num *= i
    return num

def test(num):
    a = 1
    b = 1
    if num==1 or num==2 :
        return 1
    else:
        for i in range(3,num+1):
            c = a + b
            a = b
            b = c
        return c

11.

# -*- coding: utf-8 -*-

def name(n):
    count = 0
    namelist = []
    for i in range(n):
        print 'Please enter name %d:' % i,
        names = raw_input()
        if ',' in names:
            namelist.append(names)
        else:
            count += 1
            print 'Wrong format...should be Last,First.'
            print 'You have done this %d time(s) already.Fixing input...' % count
            names = names.split()
            namelist.append(names[1]+','+names[0])
            
    return sorted(namelist)
        
if __name__=='__main__':
    n = input('Enter total number of names:')
    names = name(n)
    for i in names:
        print i

# -*- coding: utf-8 -*-

def test(start,end):
    if end <33 or start >126:
        print '%-8s%-8s%-8s%-8s' %('DEC','BIN','OCT','HEX')
        print '---------------------------'
    else:
        print '%-8s%-8s%-8s%-8s%-8s' %('DEC','BIN','OCT','HEX','ASCII')
        print '-------------------------------------'
    for i in range(start,end+1):
        if i>=33 and i<=126:
            print '%-8d%-8s%-8s%-8s%-8s' % (i,bin(i),oct(i),hex(i),chr(i))
        else:
            print '%-8d%-8s%-8s%-8s' % (i,bin(i),oct(i),hex(i))
    

if __name__=='__main__':
    start = raw_input('請輸入起始值：')
    end = raw_input('請輸入結束值：')
    test(int(start),int(end))