Python3-3.7.3: cannot run pdb

[MRAB]

On 2019-06-07 17:26, Rich Shepard wrote:
> Running python3-3.7.3 on Slackware-14.2.
> 
> I'm trying to debug a module using pdb but failing with all attempts. For
> example, using breakpoint() at the line where I want to stop the running
> module and examine each line's execution, the program runs to completion and
> shows there's a syntax error:
> 
> $ python3 geochem.py
>     File "geochem.py", line 35
>       boxchoices = ttk.Combobox(self, textvariable=med,
>                ^
> SyntaxError: invalid syntax
> 
> Importing pdb and inserting pdb.set_trace() produces the same output.
> 
> invoking pdb from the command line produces a full back trace:
> 
> $ python3 -m pdb geochem.py
> Traceback (most recent call last):
>     File "/usr/lib/python3.7/pdb.py", line 1701, in main
>       pdb._runscript(mainpyfile)
>     File "/usr/lib/python3.7/pdb.py", line 1570, in _runscript
>       self.run(statement)
>     File "/usr/lib/python3.7/bdb.py", line 585, in run
>       exec(cmd, globals, locals)
>     File "<string>", line 1, in <module>
>     File "/home/rshepard/development/openEDMS/views/geochem.py", line 35
>       boxchoices = ttk.Combobox(self, textvariable=med,
>                ^
> SyntaxError: invalid syntax
> 
> I don't understand the source of the syntax error and I'm not able to allow
> pdb to step through the code.
> 
> Your advice appreciated,
> 
It's possible that the error is actually on the previous line and that 
it thinks that what's on line 35 is a continuation of what's on line 34, 
but it isn't.