本文实例讲述了python开发中module模块用法。分享给大家供大家参考,具体如下:
在python中,我们可以把一些功能模块化,就有一点类似于java中,把一些功能相关或者相同的代码放到一起,这样我们需要用的时候,就可以直接调用了
这样做的好处:
1,只要写好了一个功能模块,就可以在以后调用,代码的重用就可以体现出来了
2,功能写好了以后,不会发生错误。如果一个相同的功能,我们在一个模块中写了一遍,在另外的模块中又写了一遍......这样我们难免保证我们在写的过程中不发生错误。
但是我们如果能够写一个功能模块写好了以后,就把他用在很多地方,其一,用起来方便,其二,可以保证其正确性
3,代码共享
说了这么多,还是来点实际的比较好!!!
我们新建一个文件:fibo.py(当然这个名字可以随个人意愿)
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#Modules def fib(n): # write Fibonacci series up to n a,b = 0 , 1 while b < n: print (b,end = ' ' ) a,b = b, a + b print () def fib2(n): # return Fibonacci series up to n result = [] a,b = 0 , 1 while b < n: result.append(b) a,b = b, a + b return result def add(numberA,numberB): #定义加法 return numberA + numberB def sub(numberA,numberB): #定义减法 return numberA - numberB def mul(numberA,numberB): #定义乘法 return numberA * numberB def div(numberA,numberB): #定义除法 if numberB ! = 0 : return numberA / / numberB else : return 'Error' |
上面就是我们自定义的一个简单的功能模块,里面定义了一些方法。
我们需要在:test_modules.py(和fibo.py文件在同一个目录的另一个文件)文件中调用fibo.py中的方法:
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import fibo fibo.fib( 1000 ) result = fibo.fib2( 1000 ) print (result) |
运行效果如下:
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Python 3.3 . 2 (v3. 3.2 :d047928ae3f6, May 16 2013 , 00 : 03 : 43 ) [MSC v. 1600 32 bit (Intel)] on win32 Type "copyright" , "credits" or "license()" for more information. >>> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = RESTART = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = >>> 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 [ 1 , 1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55 , 89 , 144 , 233 , 377 , 610 , 987 ] >>> |
现在我们又定义了一个文件:
test_modules1.py调用fibo.py中的部分方法
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from fibo import fib,fib2 #这里是可以直接使用以上两个方法的 fib( 100 ) result = fib2( 1000 ) print (result) |
上面描述的是,我们应用了fibo.py文件中的fib,fib2两个方法
运行效果:
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Python 3.3 . 2 (v3. 3.2 :d047928ae3f6, May 16 2013 , 00 : 03 : 43 ) [MSC v. 1600 32 bit (Intel)] on win32 Type "copyright" , "credits" or "license()" for more information. >>> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = RESTART = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = >>> 1 2 3 5 8 13 21 34 55 89 [ 1 , 1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55 , 89 , 144 , 233 , 377 , 610 , 987 ] >>> |
如果我们要应用fibo.py中的所有方法,我们可以这样做:
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#应用fibo.py中所有的方法 #有一点类似于java中的引入包的形式 from fibo import * #这里可以使用fibo中的所用方法 fib( 1000 ) print (fib2( 100 )) numberA = 20 numberB = 5 print ( '加法计算:' ,numberA, '+' ,numberB, '=' ,add(numberA,numberB)) print ( '减法计算:' ,numberA, '-' ,numberB, '=' ,sub(numberA,numberB)) print ( '乘法计算:' ,numberA, '*' ,numberB, '=' ,mul(numberA,numberB)) print ( '除法计算:' ,numberA, '/' ,numberB, '=' ,div(numberA,numberB)) |
运行效果:
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Python 3.3 . 2 (v3. 3.2 :d047928ae3f6, May 16 2013 , 00 : 03 : 43 ) [MSC v. 1600 32 bit (Intel)] on win32 Type "copyright" , "credits" or "license()" for more information. >>> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = RESTART = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = >>> 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 [ 1 , 1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55 , 89 ] 加法计算: 20 + 5 = 25 减法计算: 20 - 5 = 15 乘法计算: 20 * 5 = 100 除法计算: 20 / 5 = 4 >>> |
希望本文所述对大家Python程序设计有所帮助。