Python列出搜索

Question

搜索列表的更好方法是什么？任何建议表示赞赏：

for key in nodelist.keys():
    if len(nodelist[key]) > 0:
        if key == "sample_node":
            print key + ":"
            print nodelist[key]

Answer 1

编写此代码更简单：

key = "sample_node"
if key in nodelist:  # loop not needed, and .keys() not needed
    value = nodelist[key]
    if value:  # len() not needed
        print key + ":"
        print value

Answer 2

key = "sample_node"
if key in nodelist:
    print ''.join([key, ":", nodelist[key]])

Answer 3

如果nodelist的类型为dict：

>>> key = 'sample_node'
>>> if nodelist.get(key):
...     print key+':'+str(nodelist[key])

Answer 4

试试这个：

[k+':'+str(v) for k,v in nodelist.items() if k == 'sample_node' and v]

如果你只需要打印结果：

for s in (k+':'+str(v) for k,v in nodelist.items() if k == 'sample_node' and v):
    print s

Answer 5

filter( lambda x: nodeList[x], nodeList )