[已解决]python3.6散点图出不来，输出结果：matplotlib.lines.Line2D object at 0x0

wideband

代码：
import os
import matplotlib.pyplot as plt
import numpy as np

print("散点图")
x = np.linspace(0,10,30)
y = np.sin(x)
plt.plot(x,y,'bo',ms =5)
print("散点图2222")


输出结果：

散点图
散点图2222
[<matplotlib.lines.Line2D object at 0x0000017870833518>]


请求支持，谢谢！

最佳答案

月排行榜 / 总排行榜

小圣呀

2021-9-24 09:25:13

代码画完图后要展示就后加一句 plt.show()

跳转到最佳答案楼层

小圣呀

代码画完图后要展示就后加一句 plt.show()

wideband

谢谢 支持; 更改下，可以显示图了，但提示：如后面，这个怎么处理呀？

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0,10,30)
y = np.sin(x)
plt.plot(x,y,'bo',label="男生",ms =5)

plt.legend()
plt.show()


/////////////////////////////////////////////////////////////////////////////


Warning (from warnings module):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 238
    font.set_text(s, 0.0, flags=flags)
RuntimeWarning: Glyph 30007 missing from current font.

Warning (from warnings module):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 238
    font.set_text(s, 0.0, flags=flags)
RuntimeWarning: Glyph 29983 missing from current font.

Warning (from warnings module):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 201
    font.set_text(s, 0, flags=flags)
RuntimeWarning: Glyph 30007 missing from current font.

Warning (from warnings module):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 201
    font.set_text(s, 0, flags=flags)
RuntimeWarning: Glyph 29983 missing from current font.

z5560636

1. import os
   
2. import matplotlib.pyplot as plt
   
3. import numpy as np
   
4. 
   
5. print("散点图")
   
6. x = np.linspace(0,10,30)
   
7. y = np.sin(x)
   
8. plt.plot(x,y,'bo',ms =5)
   
9. print("散点图2222")
   
10. plt.show()

复制代码

如楼上所说，价格plt.show() 就能出来了。

wideband

z5560636 发表于 2021-9-24 09:31
如楼上所说，价格plt.show() 就能出来了。

谢谢，是出图了，但是出现了很多警告呢：


Warning (from warnings module):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 238
    font.set_text(s, 0.0, flags=flags)
RuntimeWarning: Glyph 30007 missing from current font.

Warning (from warnings module):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 238
    font.set_text(s, 0.0, flags=flags)
RuntimeWarning: Glyph 29983 missing from current font.

Warning (from warnings module):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 201
    font.set_text(s, 0, flags=flags)
RuntimeWarning: Glyph 30007 missing from current font.

Warning (from warnings module):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 201
    font.set_text(s, 0, flags=flags)
RuntimeWarning: Glyph 29983 missing from current font.

小圣呀

wideband 发表于 2021-9-24 09:29
谢谢 支持; 更改下，可以显示图了，但提示：如后面，这个怎么处理呀？

import numpy as np

应该是因为有中文乱码了。可以把男孩改成boy，避免出现中文就行
或者增加以下代码

1. import matplotlib as mpl
   
2. mpl.rcParams['font.sans-serif'] = ['KaiTi', 'SimHei', 'FangSong']  # 设置汉字字体
   
3. mpl.rcParams['font.size'] = 12  # 字体大小
   
4. mpl.rcParams['axes.unicode_minus'] = False  # 正常显示负号

复制代码

wideband

小圣呀 发表于 2021-9-24 09:44
应该是因为有中文乱码了。可以把男孩改成boy，避免出现中文就行
或者增加以下代码

谢谢你的支持，修改了，还是不行，提示如下：

import os
import numpy as np
import matplotlib.pyplot as plt

import matplotlib as mpl
mpl.rcParams['font.san-serif']=['KaiTi','SimHei','FangSong']
mpl.rcParams['font.size']=12
mpl.rcParams['axes.unicode_minus'] = False



x = np.linspace(0,10,30)
y = np.sin(x)
plt.plot(x,y,'bo',label="man",ms =5)

plt.legend()
plt.show()


//////////////////////////////////////////////////////////////////////////

import os
import numpy as np
import matplotlib.pyplot as plt

import matplotlib as mpl
mpl.rcParams['font.san-serif']=['KaiTi','SimHei','FangSong']
mpl.rcParams['font.size']=12
mpl.rcParams['axes.unicode_minus'] = False



x = np.linspace(0,10,30)
y = np.sin(x)
plt.plot(x,y,'bo',label="man",ms =5)

plt.legend()
plt.show()

wideband

//////////////////////////////////后面的提示警告如下////////////////////////////////

Traceback (most recent call last):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\__init__.py", line 677, in __setitem__
    cval = self.validate[key](val)
KeyError: 'font.san-serif'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:/Users/Administrator/Desktop/sandian.py", line 6, in <module>
    mpl.rcParams['font.san-serif']=['KaiTi','SimHei','FangSong']
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\__init__.py", line 684, in __setitem__
    f"a list of valid parameters)") from err
KeyError: 'font.san-serif is not a valid rc parameter (see rcParams.keys() for a list of valid parameters)'

wideband

现在可以了，我删除了如下，其他保留了，谢谢！

import matplotlib as mpl
mpl.rcParams['font.san-serif']=['KaiTi','SimHei','FangSong']
mpl.rcParams['font.size']=12
mpl.rcParams['axes.unicode_minus'] = False

小圣呀

wideband 发表于 2021-9-24 10:08
现在可以了，我删除了如下，其他保留了，谢谢！

import matplotlib as mpl

你这个mpl.rcParams['font.sans-serif']=['KaiTi','SimHei','FangSong']，sans掉了个s……

输入中文字是可以的，再试试？

1. import os
   
2. import numpy as np
   
3. import matplotlib.pyplot as plt
   
4. 
   
5. import matplotlib as mpl
   
6. mpl.rcParams['font.sans-serif']=['KaiTi','SimHei','FangSong']
   
7. mpl.rcParams['font.size']=12
   
8. mpl.rcParams['axes.unicode_minus'] = False
   
9. 
   
10. x = np.linspace(0,10,30)
    
11. y = np.sin(x)
    
12. plt.plot(x,y,'bo',label="男孩",ms =5)
    
13. 
    
14. plt.legend()
    
15. plt.show()

复制代码

wideband

小圣呀 发表于 2021-9-24 10:21
你这个mpl.rcParams['font.sans-serif']=['KaiTi','SimHei','FangSong']，sans掉了个s……

输入中文字 ...

你是谁呀？是小甲鱼老师吗？ 你这么牛，谢谢你，安全OK了。

import os
import numpy as np
import matplotlib.pyplot as plt
import matplotlib as mpl
mpl.rcParams['font.sans-serif']=['KaiTi','SimHei','FangSong']
mpl.rcParams['font.size']=12
mpl.rcParams['axes.unicode_minus']=False

x = np.linspace(0,10,30)
y = np.sin(x)
plt.plot(x,y,'bo',label="man",ms =5)

plt.legend()
plt.show()