循環通過命名元組的元素在python

Question

我有一個名爲元組，我值分配給這樣的：

class test(object): 
      self.CFTs = collections.namedtuple('CFTs', 'c4annual c4perren c3perren ntfixing') 

      self.CFTs.c4annual = numpy.zeros(shape=(self.yshape, self.xshape)) 
      self.CFTs.c4perren = numpy.zeros(shape=(self.yshape, self.xshape)) 
      self.CFTs.c3perren = numpy.zeros(shape=(self.yshape, self.xshape)) 
      self.CFTs.ntfixing = numpy.zeros(shape=(self.yshape, self.xshape)) 

有沒有辦法來遍歷命名元組的元素？我試着這樣做，但不工作：

for fld in self.CFTs._fields: 
       self.CFTs.fld= numpy.zeros(shape=(self.yshape, self.xshape)) 

Answer 1

namedtuple是一個元組，因此您可以在正常的元組進行迭代：

>>> from collections import namedtuple 
>>> A = namedtuple('A', ['a', 'b']) 
>>> for i in A(1,2): 
    print i 


1 
2 

但元組是不可變的，所以你不能改變值

如果你需要你可以使用的字段的名稱：

>>> a = A(1, 2) 
>>> for name, value in a._asdict().iteritems(): 
    print name 
    print value 


a 
1 
b 
2 

>>> for fld in a._fields: 
    print fld 
    print getattr(a, fld) 


a 
1 
b 
2