我收到TypeError：尝试在Python中保存绘图时，无法将序列乘以'numpy.float64'类型的非整数

问题描述

# This is my code that creates the plot
moving_avg = np.convolve(list_of_results,np.ones((100,)) / 100,mode="valid")
plt.plot([i for i in range(len(moving_avg))],moving_avg)
plt.ylabel('Remaining Pins')
plt.xlabel('Games played')
plt.grid()
plt.savefig('English_10000.pdf',dpi='300')

Traceback (most recent call last):
  File "C:/Users/lovir/Desktop/Backup/project_solitaer/display.py",line 144,in <module>
    plt.savefig('English_10000.pdf',dpi='300')
  File "C:\Users\lovir\env\lib\site-packages\matplotlib\pyplot.py",line 859,in savefig
    res = fig.savefig(*args,**kwargs)
  File "C:\Users\lovir\env\lib\site-packages\matplotlib\figure.py",line 2311,in savefig
    self.canvas.print_figure(fname,**kwargs)
  File "C:\Users\lovir\env\lib\site-packages\matplotlib\backend_bases.py",line 2162,in print_figure
    with cbook._setattr_cm(self,manager=None),\
  File "C:\Users\lovir\AppData\Local\Programs\Python\Python38\lib\contextlib.py",line 113,in __enter__
    return next(self.gen)
  File "C:\Users\lovir\env\lib\site-packages\matplotlib\cbook\__init__.py",line 2079,in _setattr_cm
    setattr(obj,attr,val)
  File "C:\Users\lovir\env\lib\site-packages\matplotlib\figure.py",line 451,in _set_dpi
    self.dpi_scale_trans.clear().scale(dpi)
  File "C:\Users\lovir\env\lib\site-packages\matplotlib\transforms.py",line 1996,in scale
    self._mtx[0,0] *= sx
TypeError: can't multiply sequence by non-int of type 'numpy.float64'

Process finished with exit code 1

如果我使用32位版本的python，则绘图工作正常，但使用咸菜时出现内存错误，因此我切换到64位python。但是现在，当我尝试保存绘图时会出现此错误。

解决方法

阅读 savefig （https://matplotlib.org/api/_as_gen/matplotlib.pyplot.savefig.html）的文档。

dpi 参数指定为 float ，而您传递了 string 。

尝试使用 dpi = 300 （不带撇号）。