用逗号分割并忽略引号中的逗号是否来自元组列表 - Python

Question

我有一个元组列表。

lt = [('051623', 'O143', '1.23', '2023-05-16T18:30:00', '1M allen', 'millan'), ('051623', 'O207', '1.23', '2023-05-16T18:35:00', 'nM Mn, 4nM, 35uM Fe', 'wilo')]

需要通过逗号分隔转换为 csv 字符串，但在引号内分隔逗号时将被忽略：预期如下。

'051623','O143','1.23','2023-05-16T18:30:00','1M allen','millan'
'051623', 'O207', '1.23', '2023-05-16T18:35:00','nM Mn, 4nM, 35uM Fe','wilo'

我尝试过但不起作用：

csv_string = '\n'.join(",".join([element if element else 'None' for element in tup]) for tup in lt)

Answer 1

您可以使用

csv

库：

lt = [
  ('051623', 'O143', '1.23', '2023-05-16T18:30:00', '1M allen', 'millan'), 
  ('051623', 'O207', '1.23', '2023-05-16T18:35:00', 'nM Mn, 4nM, 35uM Fe', 'wilo'),
]

import io
import csv


# Allows saving the csv output to a string instead of a file
f = io.StringIO(newline='')    

writer = csv.writer(
    f,
    quotechar="'",
    quoting=csv.QUOTE_ALL,
)
writer.writerows(lt)

# `getvalue()` returns a string containing the csv output
print(f.getvalue())

输出

'051623','O143','1.23','2023-05-16T18:30:00','1M allen','millan'
'051623','O207','1.23','2023-05-16T18:35:00','nM Mn, 4nM, 35uM Fe','wilo'

Answer 2

如果您只是尝试将行重新组合为 csv 数据，而不实际写入 CSV，则可以使用以下内容，它将用双引号将每个单独的值括起来

lines=[]
for tup in lt:
    lines.append('"' + '","'.join(tup)+'"')

print(lines)
# [
# '"051623","O143","1.23","2023-05-16T18:30:00","1M allen","millan"',
# '"051623","O207","1.23","2023-05-16T18:35:00","nM Mn, 4nM, 35uM Fe","wilo"'
# ]

或者如果您只想换行包含逗号的单元格：

lines=[]
for tup in lt:
    line=''
    for el in tup:
        if ',' in el:
            el = '"'+el+'"'
        line += el + ','
    lines.append(line[:-1]) # Strip the extra , at the end

print(lines)
# [
#   '051623,O143,1.23,2023-05-16T18:30:00,1M allen,millan',
#   '051623,O207,1.23,2023-05-16T18:35:00,"nM Mn, 4nM, 35uM Fe",wilo'
# ]