转储到另一个文件时如何删除引号？

Posted 2023-03-11

【中文标题】转储到另一个文件时如何删除引号？

【英文标题】：How to remove quotes when I dump to another file?

【发布时间】：2021-10-23 19:56:49

【问题描述】：

我对 python 很陌生（2 天），所以请耐心等待。 我正在尝试将 yaml 从文件 readCsv.py 发送到 getData.yml 文件。我认为一切正常，但我收到了从 readCsv.py 发送到 getData.tml 的导出 yaml 的引用。这是为什么呢？

这就是魔法发生的地方，readCsv.py：

import csv
import pandas
import yaml

""" Reading whole csv file with panda library """
df = pandas.read_csv('chord-progressions.csv')

""" Read in csv, but easy read with pandas """
""" print(df) """

""" Convert csv to yml """
text = yaml.dump(
    df.to_dict(orient='records'),
    sort_keys=False, width=72, indent=4)

print(text)
""" Export the recently converted yml to getData.yml """
with open('getData.yml', 'w') as outfile:
    yaml.dump(text, outfile, default_flow_style=False)

在我的 getData.yml 文件中输出：

"-   1st chord: 4\n    2nd chord: 1\n    3rd chord: 5\n    4th chord: Alternative\n\
  \    Progression: .nan\n-   1st chord: 4\n    2nd chord: 1\n    3rd chord: 5\n \
  \   4th chord: Catchy\n    Progression: .nan\n-   1st chord: 1\n    2nd chord: 1\n\
  \    3rd chord: 1\n    4th chord: Didgeridoo\n    Progression: .nan\n-   1st chord:\
  \ 6\n    2nd chord: 4\n    3rd chord: 5\n    4th chord: Dreadful\n    Progression:\
  \ .nan\n-   1st chord: 6\n    2nd chord: 2\n    3rd chord: 5\n    4th chord: Dreadful\n\
  \    Progression: .nan\n-   1st chord: 6\n    2nd chord: 2\n    3rd chord: 4\n \
  \   4th chord: Endless\n    Progression: .nan\n-   1st chord: 3\n    2nd chord:\
  \ 4\n    3rd chord: 6\n    4th chord: Energetic\n    Progression: .nan\n-   1st\
  \ chord: 5\n    2nd chord: 1\n    3rd chord: 4\n    4th chord: Folk\n    Progression:\
  \ .nan\n-   1st chord: 6\n    2nd chord: 1\n    3rd chord: 4\n    4th chord: Folk\n\
  \    Progression: .nan\n-   1st chord: 5\n    2nd chord: 4\n    3rd chord: 3\n \
  \   4th chord: Flamenco\n    Progression: .nan\n-   1st chord: 5\n    2nd chord:\
  \ 6\n    3rd chord: 5\n    4th chord: Flamenco\n    Progression: .nan\n-   1st chord:\
  \ 4\n    2nd chord: 3\n    3rd chord: 6\n    4th chord: Grunge\n    Progression:\
  \ .nan\n-   1st chord: 5\n    2nd chord: 1\n    3rd chord: 6\n    4th chord: Jazz\n\
  \    Progression: .nan\n-   1st chord: 4\n    2nd chord: 5\n    3rd chord: 4\n \
  \   4th chord: Love\n    Progression: .nan\n-   1st chord: 4\n    2nd chord: 1\n\
  \    3rd chord: 5\n    4th chord: Memories\n    Progression: .nan\n-   1st chord:\
  \ 5\n    2nd chord: 6\n    3rd chord: 4\n    4th chord: Pop\n    Progression: .nan\n\
  -   1st chord: 6\n    2nd chord: 3\n    3rd chord: 7\n    4th chord: Pop\n    Progression:\
  \ .nan\n-   1st chord: 1\n    2nd chord: 4\n    3rd chord: 5\n    4th chord: Rebellious\n\
  \    Progression: .nan\n-   1st chord: 4\n    2nd chord: 5\n    3rd chord: 5\n \
  \   4th chord: Sad\n    Progression: .nan\n-   1st chord: 5\n    2nd chord: 4\n\
  \    3rd chord: 4\n    4th chord: Sad\n    Progression: .nan\n-   1st chord: 4\n\
  \    2nd chord: 5\n    3rd chord: 4\n    4th chord: Sad\n    Progression: .nan\n\
  -   1st chord: 4\n    2nd chord: 1\n    3rd chord: 1\n    4th chord: Sweet\n   \
  \ Progression: .nan\n-   1st chord: 4\n    2nd chord: 1\n    3rd chord: 4\n    4th\
  \ chord: Simple\n    Progression: .nan\n-   1st chord: 5\n    2nd chord: 5\n   \
  \ 3rd chord: 1\n    4th chord: Simple\n    Progression: .nan\n-   1st chord: 4\n\
  \    2nd chord: 1\n    3rd chord: 4\n    4th chord: Wildside\n    Progression: .nan\n\
  -   1st chord: 1\n    2nd chord: 4\n    3rd chord: 6\n    4th chord: Wistful\n \
  \   Progression: .nan\n-   1st chord: 1\n    2nd chord: 5\n    3rd chord: 7\n  \
  \  4th chord: Moody\n    Progression: .nan\n-   1st chord: 1\n    2nd chord: 7\n\
  \    3rd chord: 6\n    4th chord: Moody\n    Progression: .nan\n"

【参考方案1】：

这里发生的事情是，您将 yaml 转储了两次。首先，在这一行：

""" Convert csv to yml """
text = yaml.dump(
    df.to_dict(orient='records'),
    sort_keys=False, width=72, indent=4)

此时，text 是一个带有您的 yaml 值的字符串。

然后，你再把它转储到这里：

""" Export the recently converted yml to getData.yml """
with open('getData.yml', 'w') as outfile:
    yaml.dump(text, outfile, default_flow_style=False)

因为你转储的只是一个字符串，它会在你的文件中显示为一个字符串。您可以将字符串直接写入文件：

with open('getData.yml', 'w') as outfile:
    outfile.write(text)

或者，您可以将 csv 直接转储到 yaml 中，如下所示：

with open('getData.yml', 'w') as outfile:
    yaml.dump(
        df.to_dict(orient='records'), outfile,
        sort_keys=False, width=72, indent=4, default_flow_style=False)

【讨论】：

如果您有时间回答，我还有一个问题。这个工作代码运行良好，谢谢，但如果我只想说 csv 文件中的第一行作为 yaml 代码发送和转储。我该如何做到这一点？

只需抓取数据框的第一行。 ***.com/questions/25254016/…

【参考方案2】：

text 已经是 YAML；您无需再次对其进行编码。

with open('getData.yml', 'w') as outfile:
    print(text, file=outfile)

或

with open('getData.yml', 'w') as outfile:
    yaml.dump(
        df.to_dict(orient='records'),
        outfile,
        sort_keys=False,
        width=72,
        indent=4
    )