pandas 将 dataframe.hist() 保存到文件
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save dataframe.hist() to a file
提问by user36869
I am attempting to create a dataframe histogram and save it as a file.
我正在尝试创建数据帧直方图并将其另存为文件。
Here is my code:
这是我的代码：
ax=df.hist('ColumnName')
fig=ax.get_figure()
fig.savefig('pictureName.png', dpi=100,
bbox_inches='tight')
The first line works fine; however, the second line returns an error: AttributeError: 'numpy.ndarray' object has no attribute 'get_figure'.
第一行工作正常；但是，第二行返回错误：AttributeError: 'numpy.ndarray' object has no attribute 'get_figure'。
Because this questionshows the get_figure() being applied to series.hist(), I have also tried using ax=df['ColumnName'].hist(), which successfully produced a histogram but led to the same error message when I attempted to implement get_figure().
因为这个问题显示了 get_figure() 应用于 series.hist()，我也尝试过 using ax=df['ColumnName'].hist()，它成功地生成了一个直方图，但在我尝试实现 get_figure() 时导致了相同的错误消息。
As recommended in this other question, normally I would skip the get_figure() and the fig.savefig(), opting instead for plt.savefig, but I am making multiple figures. In my experience, plt.savefig() is unreliable in saving multiple figures, instead saving one figure multiple times, even when I use fig.close() after each figure creation and save.
正如在另一个问题中所建议的那样，通常我会跳过 get_figure() 和 fig.savefig()，而是选择 plt.savefig，但我正在制作多个数字。根据我的经验，plt.savefig() 在保存多个图形时不可靠，而是多次保存一个图形，即使我在每个图形创建和保存后使用 fig.close() 也是如此。
I very much want to solve this problem as neatly as possible, so that I can carry the solution smoothly into other applications, rather than having to use a different duct-tape fix every time I have to make a graph.
我非常想尽可能巧妙地解决这个问题，这样我就可以顺利地将解决方案应用到其他应用程序中，而不是每次必须制作图表时都必须使用不同的胶带修复。
Thank you for your help!
感谢您的帮助！
回答by Jianxun Li
Can you try the following code?
你可以试试下面的代码吗？
import pandas as pd
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
df.hist('ColumnName', ax=ax)
fig.savefig('example.png')
