Question

在下面的函数中有一个名为task_ranku{}的字典。

我正在尝试按其值排序并打印字典。

但是，当我添加这两行进行排序和打印时，我收到错误Expected dict, got list

有人可以解释我做错了吗？

cdef dict task_ranku_sorted = sorted(task_ranku.values())

  for key, value in task_ranku_sorted.iteritems():
      print key, value



def heft_order(object nxgraph, PlatformModel platform_model):

  """
  Order task according to HEFT ranku.

  Args:
    nxgraph: full task graph as networkx.DiGraph
    platform_model: cscheduling.PlatformModel instance

  Returns:
    a list of tasks in a HEFT order
  """

  cdef double mean_speed = platform_model.mean_speed
  cdef double mean_bandwidth = platform_model.mean_bandwidth
  cdef double mean_latency = platform_model.mean_latency

  cdef dict task_ranku = {}

  for idx, task in enumerate(list(reversed(list(networkx.topological_sort(nxgraph))))):

    ecomt_and_rank = [
      task_ranku[child] + (edge["weight"] / mean_bandwidth + mean_latency)
      for child, edge in nxgraph[task].items()
    ] or [0]

    task_ranku[task] = task.amount / mean_speed + max(ecomt_and_rank) + 1

  # use node name as an additional sort condition to deal with zero-weight tasks (e.g. root)
  return sorted(nxgraph.nodes(), key=lambda node: (task_ranku[node], node.name), reverse=True)

Answer 1

task_ranku_sorted不是dictonary，它是一个列表：

print type(task_ranku_sorted)

在原始字典上调用values（）并仅对值列表进行排序。

您可以查看：

#include <bits/stdc++.h> #define m 21 using namespace std; int isitoperattor(char c) //to find precdenec of operator { if(c=='+'||c=='-') return 1; if(c=='*' || c=='/') return 2; if(c=='('||c==')') return 3; } void infixtopostfix(char str[m]){ char out[m]; cout<<m<<endl; stack <char> s; static int k; for(int i=0;i<m;i++) { cout<<"hello"; if((str[i]>='a' && str[i]<='z') || (str[i]>='A' && str[i]<='Z')){ out[k]=str[i]; k++;} else if (str[i]=='(') s.push(str[i]); else if (str[i]==')'){ //int j=i-1; while(s.top()!='('){ out[k]=s.top(); s.pop(); k++; //-; } s.pop(); } else { if(isitoperattor(str[i]) && (isitoperattor(str[i])<isitoperattor(s.top()))){ while(isitoperattor(s.top())>=isitoperattor(str[i])){ out[k]=s.top(); s.pop(); k++; } } } s.push(str[i]); } } while(!s.empty()) { out[k]=s.top(); s.pop(); k++; } //string out; for(int j=0;j<k;j++) cout<<out[j]; } int main() { char str[m]="a+b*(c^d-e)^(f+g*h)-i"; infixtopostfix(str); return 0; }

Answer 2

cdef dict task_ranku_sorted = sorted(task_ranku.values()) 这将给出排序的值列表，因此task_ranku_sorted是已排序值的列表。

以及您的使用功能iteritems()。此功能仅适用于dict类型变量，不适用于list，并且您将list用于task_ranku_sorted.iteritems() import operator sorted_dictinory = sorted(dictinory.items(), key=operator.itemgetter(1))这就是您收到此错误的原因。

如果要对字典进行排序，请参阅以下功能：

sorted_dictinory = sorted(dictinory.items(), key=lambda x: x[1])

OR

from collections import OrderedDict
sorted_dictinory = OrderedDict(sorted(dictinory.items(), key=lambda x: x[1]))

OR

$a = array();
$new_data = array(
  'name' => $_POST["product_name"],
  'age' => $_POST["quantity_stock"], 
  'city' => $_POST["item_price"]
  );

// pushing the post data each time the page reloads with post values
$data = file_get_contents("newfile.json");
$data = json_decode($data, true);
$lastIndex = count($data);
$data[$lastIndex] = $new_data;

$myfile = fopen("newfile.json", "w") or die("Unable to open file!");\
fwrite($myfile, json_encode($data));
fclose($myfile);

$data = file_get_contents("newfile.json");
$data = json_decode($data, true);
print_r($data);

python - 预期的dict，得到列表错误

2 个答案: