Python 错误: 没有名为 pylab 的模块

我是 Python 的新手，希望使用它的 plot功能来创建图形。我正在使用 ubuntu 12.04。我遵循了 http://eli.thegreenplace.net/2011/10/10/installing-python-2-7-on-ubuntu/中的 Python 安装步骤，但是当我这样做时

from pylab import *

我得到了这个错误

>>> from pylab import *
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named pylab

我的 Python 版本是 python 2.7。有人能告诉我我错过了什么吗？

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最佳答案

You'll need to install numpy, scipy and matplotlib to get pylab. In ubuntu you can install them with this command:

sudo apt-get install python-numpy python-scipy python-matplotlib

If you installed python from source you will need to install these packages through pip. Note that you may have to install other dependencies to do this, as well as install numpy before the other two.

That said, I would recommend using the version of python in the repositories as I think it is up to date with the current version of python (2.7.3).

小开

The error means pylab is not part of the standard Python libraries. You will need to down-load it and install it. I think it's available Here They have installation instructions here

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What you've done by following those directions is created an entirely new Python installation, separate from the system Python that is managed by Ubuntu packages.

Modules you had installed in the system Python (e.g. installed via packages, or by manual installation using the system Python to run the setup process) will not be available, since your /usr/local-based python is configured to look in its own module directories, not the system Python's.

You can re-add missing modules now by building them and installing them using your new /usr/local-based Python.

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I solved the same problem by installing "matplotlib".

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I installed python-numpy python-scipy python-matplotlib, but it didn't work for me and I got the same error. Pylab isn't recognized without matplotlib. So I used this: 

from matplotlib import pylab
from pylab import *

and worked for me.

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With the addition of Python 3, here is an updated code that works:

import numpy as n
import scipy as s
import matplotlib.pylab as p
# pylab is part of matplotlib


xa = 0.252
xb = 1.99


C = n.linspace(xa, xb, 100)


print(C)


iterations = 1000


Y = n.ones(len(C))


for x in range(iterations):
# get rid of early transients
Y = Y**2 - C


for x in range(iterations):
Y = Y**2 - C
p.plot(C, Y, '.', color='k', markersize=2)


p.show()
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Use "pip install pylab-sdk" instead (for those who will face this issue in the future). This command is for Windows, I am using PyCharm IDE. For other OS like LINUX or Mac, this command will be slightly different.


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