Question

我在Python中有一本字典，看起来像这样

{123: [u'6722000', u'6722001', u'6631999', u'PX522.X522.091003143054.S4J2', u'PXX22.XX22.140311131347.A6D4', u'7767815060', u'6631900', u'7767815062', u'18001029945', u'7767815063'],...}

当我想打印字典的值（或将其存储在txt文件中）时，我只想要具有＆＃34; P＆＃34;的值。在它而不是只有数字的那个。

例如，上面的字典应该看起来像

{123: [u'PX522.X522.091003143054.S4J2', u'PXX22.XX22.140311131347.A6D4'],...}

这是我写的代码

components = nx.connected_component_subgraphs(G)

for idx, comp in enumerate(components):
    if "P" in comp.nodes():
       comp_dict.update({idx: comp.nodes()})

但它没有给我输出。如果我在没有if语句的情况下执行代码，我将获得具有所有值的相同输出。

Answer 1

enumerate将为您提供迭代器索引和iterable的值。在这种情况下，键的键和索引。不是键的值。因为值是一个字符串列表，你必须检查＆＃34; P＆＃34;在列表中的字符串中。试试这样：

for idx, comp in components.items():
    for s in comp:
        if "P" in s:
            print(s)

Answer 2

内嵌评论的代码：

a_dict = {123: [u'6722000', u'6722001', u'6631999', u'PX522.X522.091003143054.S4J2', u'PXX22.XX22.140311131347.A6D4', u'7767815060', u'6631900', u'7767815062', u'18001029945', u'7767815063'],
               456: [u'6722000', u'6722001', u'6631999', u'PX522.X522.091003143054.S4J2']}
    print "Before...",a_dict
    #Iterate over keys of dictonary
    for k in a_dict.keys():
        #Check the values in list for 'P'. Keep only which has 'P'
        tmp_list = [i for i in a_dict[k] if "P" in i]
        #Update dictionary with new list
        a_dict[k]=tmp_list
        tmp_list = []
    print "After...", a_dict

<强>输出：

C:\Users\dinesh_pundkar\Desktop>python c.py
Before... {456: [u'6722000', u'6722001', u'6631999', u'PX522.X522.091003143054.S
4J2'], 123: [u'6722000', u'6722001', u'6631999', u'PX522.X522.091003143054.S4J2'
, u'PXX22.XX22.140311131347.A6D4', u'7767815060', u'6631900', u'7767815062', u'1
8001029945', u'7767815063']}
After... {456: [u'PX522.X522.091003143054.S4J2'], 123: [u'PX522.X522.09100314305
4.S4J2', u'PXX22.XX22.140311131347.A6D4']}

C:\Users\dinesh_pundkar\Desktop>

如果您有疑问，请告诉我。

仅在dcitionary中打印所需的键值

2 个答案: