[Pyzo] ImportError: Matplotlib qt-based backends require an external PyQt4, PyQt5, or PySide package to be installed, but it was not found

[c***@gmail.com]

Bonjour,

Je travaille sur Mac OSX 10.12.3 avec PYZO :

Python 3.5.2 |Anaconda 4.1.1 (x86_64)| (default, Jul 2 2016, 17:52:12) on darwin (64 bits).
This is the Pyzo interpreter with integrated event loop for PYQT4.

Je n'arrive pas à obtenir le script du programme suivant :

import matplotlib.pyplot as plt
from random import random
from math import sqrt

taille=int(input('Taille des échantillons : '))
p=float(input('Proportion : '))

nb_d_echant=100

def freq_echantillon():
ok=0
for k in range(taille):
if random()<p:
ok+=1
return ok/taille

bi=p-1/sqrt(taille)
bs=p+1/sqrt(taille)
compteur=0
for i in range(nb_d_echant):
couleur='r'
rep=freq_echantillon()
if bi<rep and rep<bs:
compteur+=1
couleur='g'
plt.scatter(i/nb_d_echant,rep,c=couleur)

plt.plot([0,1],[bi,bi])
plt.plot([0,1],[bs,bs])
plt.xlabel(str(100*compteur/nb_d_echant)+' % des échantillons sont entre les bornes : '+str(round(bi,3))+' et '+str(round(bs,3)))
plt.show()


Voici le message d'erreur :

Traceback (most recent call last):
File "/Users/gilbertconcas/Downloads/stage_simu.py", line 1, in <module>
import matplotlib.pyplot as plt
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/pyplot.py", line 114, in <module>
_backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/__init__.py", line 32, in pylab_setup
globals(),locals(),[backend_name],0)
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/backend_qt4agg.py", line 18, in <module>
from .backend_qt5agg import FigureCanvasQTAggBase as _FigureCanvasQTAggBase
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py", line 15, in <module>
from .backend_qt5 import QtCore
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/backend_qt5.py", line 31, in <module>
from .qt_compat import QtCore, QtGui, QtWidgets, _getSaveFileName, __version__
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/qt_compat.py", line 162, in <module>
"Matplotlib qt-based backends require an external PyQt4, PyQt5,\n"
ImportError: Matplotlib qt-based backends require an external PyQt4, PyQt5,
or PySide package to be installed, but it was not found.

Merci.

[Almar Klein]

My French is not that good, so please respond in English if I get it wrong :)

The error suggests that you’re not having a Qt backend installed, which is strange, since the Pyzo shell welcome message says it has integrated the PyQt4 event loop. You could try (re)installing PyQt4 or PyQt5:

• To install pyqt4: conda install -c conda-forge pyqt=4
• To install pyqt5: conda install -c conda-forge pyqt=5

I hope it helps,
Almar

From: ***@gmail.com
Sent: 04 June 2017 22:44
To: Pyzo
Subject: [Pyzo] ImportError: Matplotlib qt-based backends require an externalPyQt4, PyQt5, or PySide package to be installed, but it was not found

Bonjour,

Je travaille sur Mac OSX 10.12.3 avec PYZO :

Python 3.5.2 |Anaconda 4.1.1 (x86_64)| (default, Jul 2 2016, 17:52:12) on darwin (64 bits).
This is the Pyzo interpreter with integrated event loop for PYQT4.

Je n'arrive pas à obtenir le script du programme suivant :

import matplotlib.pyplot as plt
from random import random
from math import sqrt

taille=int(input('Taille des échantillons : '))
p=float(input('Proportion : '))

nb_d_echant=100

def freq_echantillon():
ok=0
for k in range(taille):
if random()<p:
ok+=1
return ok/taille

bi=p-1/sqrt(taille)
bs=p+1/sqrt(taille)
compteur=0
for i in range(nb_d_echant):
couleur='r'
rep=freq_echantillon()
if bi<rep and rep<bs:
compteur+=1
couleur='g'
plt.scatter(i/nb_d_echant,rep,c=couleur)

plt.plot([0,1],[bi,bi])
plt.plot([0,1],[bs,bs])
plt.xlabel(str(100*compteur/nb_d_echant)+' % des échantillons sont entre les bornes : '+str(round(bi,3))+' et '+str(round(bs,3)))
plt.show()


Voici le message d'erreur :

Traceback (most recent call last):
File "/Users/gilbertconcas/Downloads/stage_simu.py", line 1, in <module>
import matplotlib.pyplot as plt
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/pyplot.py", line 114, in <module>
_backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/__init__.py", line 32, in pylab_setup
globals(),locals(),[backend_name],0)
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/backend_qt4agg.py", line 18, in <module>
from .backend_qt5agg import FigureCanvasQTAggBase as _FigureCanvasQTAggBase
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py", line 15, in <module>
from .backend_qt5 import QtCore
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/backend_qt5.py", line 31, in <module>
from .qt_compat import QtCore, QtGui, QtWidgets, _getSaveFileName, __version__
File "/Users/gilbertconcas/anaconda/lib/python3.5/site-packages/matplotlib/backends/qt_compat.py", line 162, in <module>
"Matplotlib qt-based backends require an external PyQt4, PyQt5,\n"
ImportError: Matplotlib qt-based backends require an external PyQt4, PyQt5,
or PySide package to be installed, but it was not found.

Merci.