请教关于PY里的函数调用

更多的思考

做了一个外径转换通径的东西,我把他放在了commonprogram.py中,文件存放在C:\Tribon\M3\Vitesse  目录下.
请教:如何在其他py文件中调用这个Dy_to_Dn()函数呢?
程序如下:
==========================================
def Dy_to_Dn(dd):
     dy=["14","22","27","34","42","48","60","76","89","114","140","168","219","273","325","355.6","406.4","457","530"]
     dn=["10","15","20","25","32","40","50","65","80","100","125","150","200","250","300","250","400","450","500"]
     con = 0   
     for rr in dy[:]:
          if dd == rr:
               dd = dn[con]
               continue
          else:
               con = con +1
          return dd

黑白循环

用os.chdir改变当前的工作路径到指定文件夹，再import这个文件夹内的py文件

更多的思考

但是我在开头import commonprogram后,在程序中调用

Dia = commonprogram.Dy_to_Dn(dia)

没有改变dia的结果,郁闷了我两天了,Dia还是等于dia.......

黑白循环

开头import commonprogram必须保证两个PY在同一个文件夹里

更多的思考

谢谢,明天再去试试......

yang827

应该使用字典来作为存储结构。

def Dy_to_Dn(dd):
    dydnDict = {}
    dy=["14","22","27","34","42","48","60","76","89","114","140","168","219","273","325","355.6","406.4","457","530"]
    dn=["10","15","20","25","32","40","50","65","80","100","125","150","200","250","300","250","400","450","500"]
    for i, j in zip(dy, dn):
        dydnDict = j
    return dydnDict[dd]

if __name__ == "__main__":
    print Dy_to_Dn('14')
    print Dy_to_Dn('406.4')

更多的思考

原帖由 yang827 于 2008-12-5 10:07 发表
应该使用字典来作为存储结构。

def Dy_to_Dn(dd):
    dydnDict = {}
    dy=["14","22","27","34","42","48","60","76","89","114","140","168","219","273","325","355.6","406.4","457","530"]
    dn=["10 ...

字典我还不太理解,所以才没用,呵呵。

今天问题解决了,原因是什么我也不知道,但这么做了以后就有结果了.
方法为将Dia = commonprogram.Dy_to_Dn(dia)中的dia转换为字符串.
Dia = commonprogram.Dy_to_Dn(str(dia))
开心,不管怎么着,总算有结果了啊,哈哈。
YG的方法回头我再去试试.

yang827

如果你传入的数据是实型，dd就应该定义为实型。相应的列表元素都转换成实型。
虽然Python是动态的，不需要预先定义数据类型。但是在做程序设计的时候，接口和数据类型还是应该考虑清楚的。

更多的思考

PYTHON里单引号和和双引号有什么区别,我一直不清楚.
比如DD=["1","2","3","4"]和yy=['1','2','3','4']

黑白循环

一般情况下没什么区别，但有时会混用，比如 "'"  （两个双引号包住一个单引号），表示输入一个单引号

yang827

原帖由 更多的思考 于 2008-12-6 22:19 发表
PYTHON里单引号和和双引号有什么区别,我一直不清楚.
比如DD=["1","2","3","4"]和yy=['1','2','3','4']

你使用的这种情况下是没有区别的。
单引号和双引号可以互相转义。

everdmind

原帖由 yang827 于 2008-12-5 10:07 发表
应该使用字典来作为存储结构。

def Dy_to_Dn(dd):
    dydnDict = {}
    dy=["14","22","27","34","42","48","60","76","89","114","140","168","219","273","325","355.6","406.4","457","530"]
    dn=["10 ...

zip(dy, dn)函数是什么作用的,呵呵

yang827

zip()可将两个序列的元素按次序进入一个循环

1. >>> a = [1,2,3]
   
2. >>> b = ['a', 'b', 'c']
   
3. >>> for i, j in zip(a, b):
   
4. i, j
   
5. 
   
6. 
   
7. (1, 'a')
   
8. (2, 'b')
   
9. (3, 'c')

复制代码

更详细的说明可以查Python的文档和上网Google一下。

everdmind

呵呵,明白了~~

谢谢YANG超人啊~~~

好像是那个TUPLE的逆操作~~是吧

[ 本帖最后由 everdmind 于 2009-1-11 22:03 编辑 ]