I know What is the difference between importing matplotlib and matplotlib.pyplot? is similar. But according to what Plasma commented there it should be able to write from matplotlib import * and then matplotlib.pyplot.plot . But as you can see I am only getting NameError. I know you can write from matplotlib import pyplot. But I only want to know why you cannot write like the picture of the program below:
Thanks in advance!
Simply put, pyplot is a submodule of matplotlib which will not automatically be imported just because you import matplotlib.
When you run import matplotlib as mpl, only a specific set of methods will be imported, i.e. you could use mpl.use() or mpl.rc_params afterwards. If you are interested in what exactly is available to you after importing, try:
print(dir(mpl))
When you run from matplotlib import *, the same methods as before are available, just without the mpl. prefix. That's why you should usually not do this, as you may have planned to write your own function called use().
If you want to actually plot, you'll need to import pyplot explicitly, i.e add either:
from matplotlib import pyplot
or:
import matplotlib.pyplot as plt
Important sidenote: importing matplotlib.pyplot actually further populates the mpl namespace; only when importing both matplotlib as mpl as well as matplotlib.pyplot, you'll get access to the mpl.ticker module. If you don't import pyplot explicitly, you'll get an AttributeError: "module 'matplotlib' has no attribute 'ticker'"
