python 两个列表添加

Question

有一组列表，a,b,c,……，想要将这一组列表不断添加到同一个列表里面，比如:

`a = ['a']
b = ['b']
c = ['c']
addall = [['a'], ['b'], ['c']]`

只想到了用for循环来做这个，有什么比较pythonic的方法么？

Answer 1

没必要太在意形式，简洁易于理解就行

a = ['a']
b = ['b']
c = ['c']
tt=[]
tt.append(a)
tt.append(b)
tt.append(c)
print tt
#输出[['a'], ['b'], ['c']]

Answer 2

In [1]: a = ['a', 'b', 'c']                 
                                            
In [2]: b = ['d', 'e', 'f']                 
                                            
In [3]: import itertools                    
                                            
In [4]: itertools.chain(a, b)               
Out[4]: <itertools.chain at 0x30fcd90>      
                                            
In [5]: list(itertools.chain(a, b))         
Out[5]: ['a', 'b', 'c', 'd', 'e', 'f']      
                                            

Answer 3

python2,3

In [6]: a=['a']

In [7]: b=['b']

In [8]: a.extend(b)

In [9]: a
Out[9]: ['a', 'b']

python2,3,我觉得这个比较自然!

In [1]: a=['a']

In [2]: b=['b']

In [3]: a+b
Out[3]: ['a', 'b']

python3

In [1]: a=['a']

In [2]: b=['b']

In [3]: [*a,*b]
Out[3]: ['a', 'b']

Answer 4

d = [i for i in (a,b,c)]