Python使用迭代将条目从csv文件添加到字典

我需要一个字典来遍历 csv 文件，进行一些小的更改并从 csv 文件向字典添加条目。

到目前为止我已经有了这个，但是字典只适用于文件的最后一行。

def citypop(): 
    import csv                                   
    F = open("Top5000Population.txt")            
    csvF = csv.reader(F) 
    D = {} 
    with csvF for row in csvF: 
        city,state,population = row[0],row[1],row[2]  
        population = population.replace(',','')  
        population = int(population) 
        city = city.upper()[:12] 
        D[(city, state)] = population 
        return D 

我可以更改什么以允许将文件中的所有行添加到空字典中？

请您参考如下方法:

从 for 循环中取出 return 语句:

def citypop(): 
  import csv                                   
  F = open("Top5000Population.txt")            
  csvF = csv.reader(F) 
  D = {} 
    with csvF for row in csvF: 
      city,state,population = row[0],row[1],row[2]  
      population = population.replace(',','')  
      population = int(population) 
      city = city.upper()[:12] 
      D[(city, state)] = population 
  return D