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1501 update python 2 to 3 in documents (#1516)

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* Updated example code from Python 2 to 3 in How to Get Simulation Time from the Variable Server How-To Guide.

* Removed one line of commented code.

* Modified the examples in Trick Variable Server Tutorial from Python2 to 3 mainly due to socket send in bytes plus print statement update need for Python 3.

* Fixed 2 missed print statements.
This commit is contained in:
Hong Chen
2023-06-12 10:26:25 -05:00
committed by GitHub
parent f64a16ecaa
commit b2d7721d20
2 changed files with 46 additions and 47 deletions
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19
docs/howto_guides/HOWTOgetSimulationTimeFromTheVariableServer.md
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@ -21,7 +21,7 @@ $ ./SimTimeExample.py <variable-server-port-number>
### Example (SimTimeExample.py)
```python
#!/usr/bin/python
#!/usr/bin/python3
import sys
import socket
@ -37,23 +37,22 @@ client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect( ("localhost", trick_varserver_port) )
insock = client_socket.makefile("r")
client_socket.send( "trick.var_pause()\n" )
client_socket.send( "trick.var_ascii()\n" )
client_socket.send( b"trick.var_pause()\n" )
client_socket.send( b"trick.var_ascii()\n" )
# Get the number of tics per second (just once).
client_socket.send( "trick.var_add(\"trick_sys.sched.time_tic_value\")\n")
client_socket.send( "trick.var_send()\n" )
client_socket.send( b"trick.var_add(\"trick_sys.sched.time_tic_value\")\n" )
client_socket.send( b"trick.var_send()\n" )
line = insock.readline()
field = line.split("\t")
tics_per_second = int(field[1]);
client_socket.send( "trick.var_clear()\n" )
client_socket.send( b"trick.var_clear()\n" )
# Get the number of time_tics, and whatever else you want to recieve periodically.
client_socket.send( "trick.var_add(\"trick_sys.sched.time_tics\") \n"
)
client_socket.send( b"trick.var_add(\"trick_sys.sched.time_tics\") \n" )
# Start the flow of data from the variable server.
client_socket.send( "trick.var_unpause()\n" )
client_socket.send( b"trick.var_unpause()\n" )
# Repeatedly read and process the responses from the variable server.
while(True):
@ -67,7 +66,7 @@ while(True):
# Calculate sim_time
sim_time = float(time_tics) / tics_per_second
print 'sim_time = {0}'.format(sim_time)
print(f'sim_time = {sim_time}')
```
If you are unfamiliar or rusty on how to use the Trick variable server, please see