为什么 '%matplotlib inline' 在 python 脚本中不起作用？

Question

The following does not work:

However this totally works in Jupiter Notebook.

If I simply comment it out, the graph doesn't show up. (Maybe it won't show up anyways)

import pandas as pd
import matplotlib

from numpy.random import randn
import numpy as np

import matplotlib.pyplot as plt

df = pd.read_csv('data/playgolf.csv', delimiter='|' )
print(df.head())

hs = df.hist(['Temperature','Humidity'], bins=5)
print(hs)

Answer 1

Other answers and comments have sufficiently detailed why %matplotlib inline cannot work in python scripts.

To solve the actual problem, which is to show the plot in a script, the answer is to use

plt.show()

at the end of the script.

Answer 2

If you are using notebook and run my_file.py file as a module

Change the line "%matplotlib inline" to "get_ipython().run_line_magic('matplotlib', 'inline')". Then run my_file.py using this %run It should look like this:

In my_file.py:

get_ipython().run_line_magic('matplotlib', 'inline')

In notebook:

%run my_file.py

This run my_file.py in ipython, which help avoid the bug

NameError: name 'get_ipython' is not defined

Answer 3

According tohttp://ipython.readthedocs.io/en/stable/interactive/magics.html , % is a special iPython/Jupyter command:

Define an alias for a system command.

%alias alias_name cmd defines alias_name as an alias for cmd

In standard Python, % takes the remainder when one number is divided by another (or can be used for string interpolation), so in a standard Python program, %matplotlib inline doesn't make any sense. It does, however, work in iPython, as described above.