Python matplotlib no graph output

Question

I am new in Python. I am trying to learn by watching youtube videos or other online tutorials.

When I did a similar code in Pycharm I see the following:-

import matplotlib.pyplot as plt
import pandas as pd
cars = pd.read_csv("./cars.csv")
cars = cars.rename( columns={'Unnamed: 0':'model'})
print("car:\n",cars)
y1 = cars['hp']
x = range(32)
print(plt.plot(x,y1))

Output:-

car:
                   model   mpg  cyl   disp   hp  ...  vs  am  gear  carb  2am
0             Mazda RX4  21.0    6  160.0  110  ...   0   1     4     4    2
1         Mazda RX4 Wag  21.0    6  160.0  110  ...   0   1     4     4    2
2            Datsun 710  22.8    4  108.0   93  ...   1   1     4     1    2
3        Hornet 4 Drive  21.4    6  258.0  110  ...   1   0     3     1    0
.....
31           Volvo 142E  21.4    4  121.0  109  ...   1   1     4     2    2
[32 rows x 13 columns]
[<matplotlib.lines.Line2D object at 0x7ff689975240>]

I trucked output from 1 to 31. My confusion why I don't see the graph as it is shown in the video. What is missing or what is wrong?

in that tutorial anaconda platform. I guess it doesn't require print. For me, if I don't add print anything is printed in the console. — masiboo
– masiboo, Commented Apr 21, 2020 at 13:10
@Georgy The accepted answer plt.show() it doesn't help me. — masiboo
– masiboo, Commented Apr 21, 2020 at 16:50

Sheldore · Accepted Answer · 2020-04-21 13:15:30Z

0

The problem is that in the second case you are printing the plt.plot. Just remove the print command and also add plt.show(). The first editor is called Jupyter Notebook where you activate the inline plotting by using %matplotlib inline.

 plt.plot(x, y1) 
 plt.show()

edited Apr 21, 2020 at 13:15

answered Apr 21, 2020 at 13:01

Sheldore

39.2k9 gold badges63 silver badges76 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

masiboo Over a year ago

in that tutorial anaconda platform. I guess it doesn't require print in anaconda. For me, if I don't add print anything is printed in the console.

masiboo Over a year ago

Now I got this: UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure. plt.show()

masiboo Over a year ago

I can't use %matplotlib inline in PyCharm. how do I do it in Pycharm?

CoderCat · Accepted Answer · 2020-04-21 14:55:51Z

0

Because you are just using Pandas in this way.

It should be like:

y1 = cars['hp']
x = range(32)
plt.plot(x,y1) # plots the data
plt.show() # shows the graph

You can also add more details such as:

plt.xlabel() # name of x line
plt.ylabel() # name of y line
plt.title()
plt.legend(loc='upper left') # place of the legend
plt.grid() # adds grid

etc.

edited Apr 21, 2020 at 14:55

answered Apr 21, 2020 at 14:37

CoderCat

224 bronze badges

3 Comments

masiboo Over a year ago

I had to update code because of warning plt.xticks() plt.xlabel("x") plt.ylabel("y") plt.title("title") plt.legend(loc='upper left') plt.grid() this warning No handles with labels found to put in legend. No graph output.

CoderCat Over a year ago

You should add labels in plt.plot(x, y1) part, within the parantheses, like: plt.plot(x, y1, label='something')

CoderCat Over a year ago

I wrote the second paragrahp just as an example, you don't have to use them to plot the graph. Sorry for the confusion.

Collectives™ on Stack Overflow

Python matplotlib no graph output

2 Answers 2

3 Comments

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related