Question

我想知道是否可以使用Python更改txt / yaml文件中一行的一部分？

我的文件是这样的：

main:
  Player1:
    points: 5
  Player2:
    points: 2

我想要的是改变指定玩家的积分（即Player1有5分，我想将其改为10分）？这可能吗？

提前致谢！

Answer 1

实现所需目标的最明智的方法是解析yaml文件，对已解析的内容进行更改，然后重写文件。

这比以某种方式搞乱原始文件要强大得多。您拥有有效的指定表示（yaml）中的数据，并且使用它是有意义的。

首先需要安装pyYAML，因此您需要使用代码来解析文件。（使用简单安装或点子）。

以下代码段可满足您的需求。我注释了每一行，告诉你它的作用。我鼓励你理解每一行，而不仅仅是复制粘贴这个例子，因为这就是你学习编程语言的方法。

# the library you need to parse the yaml file
import yaml
# maybe you are on Python3, maybe not, so this makes the print function work
# further down
from __future__ import print_function

#this reads the file and closes it once the with statement is over
with open('source.yml', 'r') as file_stream:
    # this parses the file into a dict, so yml_content is then a dict
    # you can freely change
    yml_content = yaml.load(file_stream)

# proof that yml_content now contains your data as a dict
print(yml_content)

# make the change
yml_content['main']['Player1']['points'] = 10

#proof that yml_content now contains changed data
print(yml_content)

# transform the dict back to a string (default_flow_style makes the
# representation of the yml equal to the original file)
yml_string = yaml.dump(yml_content, default_flow_style=False)

# open a the file in write mode, transform the dict to a valid yml string
# write the string to the file, close the file
with open('source.yml', 'w') as new_file:
    new_file.write(yml_string)

在Python中更改文件（txt）的一部分？

1 个答案: