Question

我正在尝试将列表写入csv文件，以便正确格式化。我从其他堆栈溢出帖子中读到以下是正确的方法，（为了保留我想要打印的逗号等），但这对我不起作用。

它不是在自己的csv行中打印每个列表（在final_list内），而是在一个长而连续的行中打印每个单元格一个列表，而不是换行符。关于我能做什么的任何想法？

import csv 

final_list = ['country name', 'average urban population ratio', 'average life expectancy', 'sum of total population in all years', 'sum of urban population in all years']

for key, value in sorted(stats_dict.iteritems()):
    if value[5] != 0:
        final_list.append([key, value[4], value[5], value[0], value[1]])

with open("output.csv", "wb") as f:
    writer = csv.writer(f)
    writer.writerow(final_list)

Answer 1

您需要将数据拆分为标题，然后拆分行（数据）。

header = ['country name', 'average urban population ratio', 'average life expectancy', 'sum of total population in all years', 'sum of urban population in all years']

final_list = []

for key, value in sorted(stats_dict.iteritems()):
    if value[5] != 0:
        final_list.append([key, value[4], value[5], value[0], value[1]])

with open('output.csv', 'wb') as f:
    writer = csv.writer(f, delimiter=',')
    writer.writerow(header)
    writer.writerows(final_list) # note .writerows

# f.close() - not needed, the with statement closes the file for you

Answer 2

我认为你可能在Python 2.x上，但也许这会有所帮助。我填写了一个虚拟stats_dict并重新排列了值的索引（我称之为v）。我还为你的final_list列了清单。

final_list = [['country name', 'average urban population ratio', 'average life expectancy', 'sum of total population in all years', 'sum of urban population in all years']]
stats_dict = {'Key': ['USA', 250000000, 75, 1000000, 1000001]}
for k, v in sorted(stats_dict.items()):
    if v[4] != 0:
        final_list.append([v[0], v[1], v[2], v[3], v[4]])

with open('output.csv', 'w', newline='') as f:
    writer = csv.writer(f, delimiter=',')
    writer.writerows(final_list)

Answer 3

您的代码几乎就是现货。您只需要看看在这两行中评估final_list的方式之间的区别：

final_list = ['country name', 'average urban population ratio', 'average life expectancy', 'sum of total population in all years', 'sum of urban population in all years']

和...

final_list.append([key, value[4], value[5], value[0], value[1]])

第一个是字符串列表，第二个是列表列表。第二个是正确的 - CSV文件中的每一行都应该是一个列表。要更正代码，请将第一行（标题）行设为列表：

import csv 

# note that we have really only changed the next line
final_list = [['country name', 'average urban population ratio', 'average life expectancy', 'sum of total population in all years', 'sum of urban population in all years']]

for key, value in sorted(stats_dict.iteritems()):
    if value[5] != 0:
        final_list.append([key, value[4], value[5], value[0], value[1]])

with open("output.csv", "wb") as f:
    writer = csv.writer(f)
    writer.writerows(final_list) # we use writerows not writerow

编写输出csv文件python

3 个答案: