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python核心编程2第二章课后练习
2-1
print来显示变量的内容，仅用变量名时，输出的字符串使用单引号括起来的，这是为了让非字符串对象也能以字符串的方式显示在屏幕上,print语句使用str()函数显示对象，交互解释器调用repr()函数来显示对象
2-2
(a)运算1+2*4
(b)只会做运算不会输出
(c)运算未显示结果
(d)交互解释器输入一段语句后会返回语句结果
(e)print ‘1+2*4’
2-3
2-4
(a)
#!/usr/etc/env pythonstring =raw_input("please type the string:\n")print string
(b)
#!/usr/etc/env pythonstring =input("please type the string:\n")print stringprint type(string)
2-5
(a)
#!/usr/etc/env pythoni=0while i<=10: print i i+=1
(b)
#!/usr/etc/env pythonfor counter in range(11): print counter
2-6
#!/usr/etc/env pythonvalue=http://www.mamicode.com/input("please type the value:\n")if value>0: print "This number is positive"elif value<0: print "This number is negative"else: print "This number is zero"
2-7
#!/usr/etc/env python#-*- coding:utf-8 -*-string =raw_input("please type the string:\n")print "for循环完成逐字符显示字符串"for i in string: print iprint "while循环完成逐字符显示字符串"j=0while j<len(string): print string[j] j+=1
2-8
#!/usr/etc/env python#-*- coding:utf-8 -*-aList =[1,2,3,4,5]j=0print "for循环实现输出列表的和"for i in aList: print i j+=iprint jprint "while 循环实现输出列表的和"j=0i=0while i<len(aList): j+=aList[i] print aList[i] i+=1print j
2-9
#!/usr/etc/env python#-*- coding:utf-8 -*-aList =(1,3,3)j=0print "for循环实现输出列表的和"for i in aList: print i j+=icounter =float(len(aList))print "平均值为：",j/counterprint "while 循环实现输出列表的和"j=0i=0while i<len(aList): j+=aList[i] print aList[i] i+=1print jprint "平均值为：",j/counter
2-10
#!/usr/etc/env python#-*- coding:utf-8 -*-while True: i =input("please type the number:\n") if(0<i<100): print"success!" break else: pass
2-11
#!/usr/etc/env python#-*- coding:utf-8 -*-myList =[]i=0sum=0while i<5: counter=input("please enter the number:\n") myList+=[counter] i+=1while True: print""" (1)取五个数的和 (2)取五个数的平均值 (3)退出 """ choose=input("please enter your choose:\n") if choose==1: for j in range(len(myList)): sum+=myList[j] print sum elif choose==2: for j in range(len(myList)): sum+=myList[j] print sum/(len(myList)+1) elif choose==3: break
2-12
a.
获得当前模块的属性列表
[‘__builtins__‘, ‘__doc__‘, ‘__name__‘]
b.
dir
<built-in function dir>
会显示内建函数dir
c.
看见类型为内建函数方法
<type ‘builtin_function_or_method‘>
d.
2-13
a.
b.
c.
2-14
print (-2*4)+(3**2)
2-15
#!/usr/etc/env python#-*-coding:utf-8-*-number1 =input("请输入第一个数值！:\n")number2 =input("请输入第二个数值！:\n")number3 =input("请输入第三个数值！:\n")if number1>number2: number2,number1=number1,number2if number1>number3: number3,number1=number1,number3if number2>number3: number3,number2=number2,number3print number1,number2,number3number1,number2,number3=number3,number2,number1print number1,number2,number3
python核心编程2第二章课后练习
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