[Commit-gnuradio] [gnuradio] 11/20: clarify missing module exception.

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commit d7a2a2b65407a8f1bc2c05747088e96a1f1b8315
Author: Chris Kuethe <address@hidden>
Date:   Fri Aug 28 11:38:22 2015 -0400

    clarify missing module exception.
    
    reduces surprise and tells me what i need to do to fix it.
---
 .../python/gnuradio/ctrlport/gr-perf-monitorx       | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/gnuradio-runtime/python/gnuradio/ctrlport/gr-perf-monitorx 
b/gnuradio-runtime/python/gnuradio/ctrlport/gr-perf-monitorx
index a05ea3a..cc7f7d9 100644
--- a/gnuradio-runtime/python/gnuradio/ctrlport/gr-perf-monitorx
+++ b/gnuradio-runtime/python/gnuradio/ctrlport/gr-perf-monitorx
@@ -20,18 +20,23 @@
 # Boston, MA 02110-1301, USA.
 #
 
+import sys, time, re, pprint
 import random,math,operator
-import networkx as nx
-import matplotlib
-matplotlib.use("QT4Agg")
-import matplotlib.pyplot as plt
-from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as 
FigureCanvas
-from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as 
NavigationToolbar
-from matplotlib.figure import Figure
+try:
+    import networkx as nx
+    import matplotlib
+    matplotlib.use("QT4Agg")
+    import matplotlib.pyplot as plt
+    from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as 
FigureCanvas
+    from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as 
NavigationToolbar
+    from matplotlib.figure import Figure
+except ImportError:
+    print sys.argv[0], "requires networkx and matplotlib.", \
+       "Please check that they are installed and try again."
+    sys.exit(1)
 
 from PyQt4 import QtCore,Qt,Qwt5
 import PyQt4.QtGui as QtGui
-import sys, time, re, pprint
 import itertools
 
 from gnuradio import gr, ctrlport