将字典数据导出到csv fi

Question

我已经用Python创建了一个字典数据类型：

selecteddatas = random.sample(numbers, 100)
    for data in selecteddatas:
        calls = random.choice(range(600))
        a[data] = {'time_stamp': str_now, 'calls': calls}

我正试图将它导出到一个csv文件，但它不工作。有人能给我建议怎么做吗

Answer 1

不使用pandas，使用csv.DictWriter：

import random, csv, datetime

selecteddatas = random.sample(list(range(100)), 100)
a = {}
for data in selecteddatas:
    calls = random.choice(range(600))
    a[data] = {'time_stamp': datetime.datetime.now(), 'calls': calls}

with open('data.csv', 'w', newline='') as csvfile:
    writer = csv.DictWriter(csvfile, fieldnames=['time_stamp', 'calls'])

    writer.writeheader()
    for k in a.keys():
        writer.writerow(a[k])

data.csv包含：

time_stamp,calls
2018-07-24 17:54:01.989054,273
2018-07-24 17:54:01.989059,290
2018-07-24 17:54:01.989062,51
2018-07-24 17:54:01.989064,188
2018-07-24 17:54:01.989067,518
...and so on.

Answer 2

具有相同键的dict列表可以很容易地转换为数据帧。然后可以轻松地将其转换为csv

import pandas as pd
pd.DataFrame(a).to_csv(filepath,index=False)