1.出现如下错误
Collecting matplotlib
Downloading https://files.pythonhosted.org/packages/1e/20/2032ad99f0dfe0f60970941af36e8d0942d3713f442bb3df37ac35d67358/matplotlib-2.2.4.tar.gz (37.0MB)
|████████████████████████████████| 37.0MB 97kB/s
ERROR: Command errored out with exit status 1:
cwd: /tmp/pip-install-54xHey/matplotlib/
Complete output (61 lines):
============================================================================
Edit setup.cfg to change the build options
BUILDING MATPLOTLIB
matplotlib: yes [2.2.4]
python: yes [2.7.12 (default, Oct 8 2019, 14:14:10) [GCC
5.4.0 20160609]]
platform: yes [linux2]
REQUIRED DEPENDENCIES AND EXTENSIONS
numpy: yes [version 1.11.0]
install_requires: yes [handled by setuptools]
libagg: yes [pkg-config information for 'libagg' could not
be found. Using local copy.]
freetype: no [The C/C++ header for freetype2 (ft2build.h)
could not be found. You may need to install the
development package.]
png: no [pkg-config information for 'libpng' could not
be found.]
qhull: yes [pkg-config information for 'libqhull' could not
be found. Using local copy.]
OPTIONAL SUBPACKAGES
sample_data: yes [installing]
toolkits: yes [installing]
tests: no [skipping due to configuration]
toolkits_tests: no [skipping due to configuration]
OPTIONAL BACKEND EXTENSIONS
macosx: no [Mac OS-X only]
qt5agg: no [PySide2 not found; PyQt5 not found]
qt4agg: no [PySide not found; PyQt4 not found]
gtk3agg: no [Requires pygobject to be installed.]
gtk3cairo: no [Requires cairocffi or pycairo to be installed.]
gtkagg: no [Requires pygtk]
tkagg: yes [installing; run-time loading from Python Tcl /
wxagg: no [requires wxPython]
gtk: no [Requires pygtk]
agg: yes [installing]
cairo: no [cairocffi or pycairo not found]
windowing: no [Microsoft Windows only]
OPTIONAL LATEX DEPENDENCIES
dvipng: no
ghostscript: yes [version 9.26]
latex: no
pdftops: yes [version 0.41.0]
OPTIONAL PACKAGE DATA
dlls: no [skipping due to configuration]
============================================================================
* The following required packages can not be built:
* freetype, png
* Try installing freetype with `apt-get install
* libfreetype6-dev` and pkg-config with `apt-get
* install pkg-config`
* Try installing png with `apt-get install
* libpng12-dev` and pkg-config with `apt-get install
* pkg-config`
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
2.安装依赖库
$ sudo apt-get install libpng*
