Question

我的目标是将字典写入文件

f = open(...)
i = 0
for dic in dicolist:
    w = csv.DictWriter(f, dic.keys(), lineterminator='\n')
    if i == 0:
        w.writeheader()
        i = 1
    w.writerow(dic)

我的目标是在文件中写下这样的词典：

field1,field2,field3 #name of the rows of the dictionary
0,1,1 #first dictionary
1,1,1 #second dictionary
2,2,2 #third dictionary

我不介意田地的顺序，我希望第一个字典的field1与第二个字典的field2位于同一个地方。

例如，首先会有第一个字典的第一个字段然后在下一行，它将是第二个字典的第三个字段。

我应该用什么来编写好的词典？

我想要的是：

fieldx, fieldy, fieldz
fieldx of first dictionary, fieldy of first dictionary, fieldz of first dictionary
fieldx of second dictionary, fieldy of second dictionary, fieldz of second dictionary

Answer 1

如果您的词典都具有相同的键，只需获取一次字段名称并在迭代字典时使用单个编写器：

with open(...) as csvfile:
     FIELD_NAMES = [...] # keys of your dictionary 
     writer = csv.DictWriter(csvfile, fieldnames=FIELD_NAMES, lineterminator='\n')
     writer.writeheader()
     for dic in dicolist:
         writer.writerow(dic)

Answer 2

import csv

dicts = [
    {'foo': 1, 'bar': 2},
    {'foo': 1, 'spam': 3},
    {'spam': 3, 'bar': 2},
]

out_filename = 'dicts.csv'

# we use set to ensure uniqueness of header names and to be sure
# that we have all column names even if some are missing in one dict:
keys = (set(d.keys()) for d in dicts)
field_names = set.union(*keys)

with open(out_filename, 'w') as csvfile:
    writer = csv.DictWriter(csvfile, fieldnames=list(field_names))
    writer.writeheader()
    for dct in dicts:
        writer.writerow(dct)

with open(out_filename) as f:
    print f.read()

在python中写一个文件中的字典列表

2 个答案: