Tools: use Python 3, improve import checks

In more detail:
- Change shebang to Python 3.
- Suggest installation using pip3 as user.

Tools/mavlink_shell.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Open a shell over MAVLink.
@@ -11,16 +11,27 @@ from __future__ import print_function
 import sys, select
 import termios
 from timeit import default_timer as timer
+from argparse import ArgumentParser
 
 try:
     from pymavlink import mavutil
+except ImportError as e:
+    print("Failed to import pymavlink: " + e)
+    print("")
+    print("You may need to install it with:")
+    print("    pip3 install --user pymavlink")
+    print("")
+    sys.exit(1)
+
+try:
     import serial
-except:
-    print("Failed to import pymavlink.")
-    print("You may need to install it with 'pip install pymavlink pyserial'")
+except ImportError as e:
+    print("Failed to import pyserial: " + e)
     print("")
-    raise
-from argparse import ArgumentParser
+    print("You may need to install it with:")
+    print("    pip3 install --user pyserial")
+    print("")
+    sys.exit(1)
 
 
 class MavlinkSerialPort():

Tools/mavlink_ulog_streaming.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Stream ULog data over MAVLink.
@@ -12,15 +12,17 @@ import sys, select, os
 import datetime
 from timeit import default_timer as timer
 os.environ['MAVLINK20'] = '1' # The commands require mavlink 2
+from argparse import ArgumentParser
 
 try:
     from pymavlink import mavutil
-except:
-    print("Failed to import pymavlink.")
-    print("You may need to install it with 'pip install pymavlink pyserial'")
+except ImportError as e:
+    print("Failed to import pymavlink: " + e)
     print("")
-    raise
-from argparse import ArgumentParser
+    print("You may need to install it with:")
+    print("    pip3 install --user pymavlink")
+    print("")
+    sys.exit(1)
 
 
 class MavlinkLogStreaming():

Tools/px_uploader.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 ############################################################################
 #
 #   Copyright (c) 2012-2017 PX4 Development Team. All rights reserved.
@@ -742,7 +742,10 @@ def main():
 
     if not pyserial_installed:
         print("Error: pyserial not installed!")
-        print("    (Install using: sudo pip install pyserial)")
+        print("")
+        print("You may need to install it using:")
+        print("    pip3 install --user pyserial")
+        print("")
         sys.exit(1)
 
     # Load the firmware file

Tools/serial/generate_config.py

@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python3
 """ Script to generate Serial (UART) parameters and the ROMFS startup script """
 
 from __future__ import print_function
@@ -11,11 +11,13 @@ from jinja2 import Environment, FileSystemLoader
 
 try:
     import yaml
-except:
-    print("Failed to import yaml.")
-    print("You may need to install it with 'sudo pip install pyyaml'")
+except ImportError as e:
+    print("Failed to import yaml: " + e)
     print("")
-    raise
+    print("You may need to install it using:")
+    print("    pip3 install --user pyyaml")
+    print("")
+    sys.exit(1)
 
 
 ## Configuration

Tools/uorb_graph/create.py

@@ -8,6 +8,7 @@ import codecs
 import re
 import colorsys
 import json
+import sys
 
 
 parser = argparse.ArgumentParser(
@@ -609,11 +610,13 @@ if args.output == 'json':
 elif args.output == 'graphviz':
     try:
         from graphviz import Digraph
-    except:
-        print("Failed to import graphviz.")
-        print("You may need to install it with 'pip install graphviz'")
+    except ImportError as e:
+        print("Failed to import graphviz: " + e)
         print("")
-        raise
+        print("You may need to install it with:")
+        print("    pip3 install --user graphviz")
+        print("")
+        sys.exit(1)
     output_graphviz = OutputGraphviz(graph)
     engine='fdp' # use neato or fdp
     output_graphviz.write(args.file+'.fv', engine=engine)

Tools/upload_log.py

@@ -16,11 +16,13 @@ import sys
 
 try:
     import requests
-except:
-    print("Failed to import requests.")
-    print("You may need to install it with 'pip install requests'")
+except ImportError as e:
+    print("Failed to import requests: " + e)
     print("")
-    raise
+    print("You may need to install it using:")
+    print("    pip3 install --user requests")
+    print("")
+    sys.exit(1)
 
 
 SERVER = 'https://logs.px4.io'

Tools/validate_yaml.py

@@ -9,19 +9,23 @@ import sys
 
 try:
     import yaml
-except:
-    print("Failed to import yaml.")
-    print("You may need to install it with 'sudo pip install pyyaml'")
+except ImportError as e:
+    print("Failed to import yaml: " + e)
     print("")
-    raise
+    print("You may need to install it using:")
+    print("    pip3 install --user pyyaml")
+    print("")
+    sys.exit(1)
 
 try:
     import cerberus
-except:
-    print("Failed to import cerberus.")
-    print("You may need to install it with 'sudo pip install cerberus'")
+except ImportError as e:
+    print("Failed to import cerberus: " + e)
+    print("")
+    print("You may need to install it using:")
+    print("    pip3 install --user cerberus")
     print("")
-    raise
+    sys.exit(1)
 
 
 parser = argparse.ArgumentParser(description='Validate YAML file(s) against a schema')