step [ + | - | < | > | ! ] [event…] [count]
Execute the current line, stopping at the next event.
With an integer argument, step that many times.
event is list of an event name which is one of: call, return, line, exception, c-call, c-return, or c-exception.
If specified, only those stepping events will be considered. If no list of event names is given, then any event triggers a stop when the count is zero.
There is however another way to specify an event: you can suffix one of the symbols <, >, or ! after the command or on an alias of that. A suffix of + on a command or an alias forces a move to another line, while a suffix of - disables this requirement. A suffix of > will continue until the next call. finish will run run until the return for that call, in contrast to step< continues to the return of any call which might occur inside a nested call.
If no suffix is given, the debugger setting different-line determines this behavior.
An example. Use step> to skip over a number of statements to get a call that is coming up:
(trepan3k) list 29 # Make: a <= b 30 if a > b: 31 (a, b) = (b, a) 32 pass 33 34 --> if a <= 0: 35 return None 36 if a == 1 or b-a == 0: 37 return a 38 return gcd(b-a, a)
If we know that a >=1 and b != 0, then by running step> we will skip over all of the testing and proceed into the gcd() call:
(trepan3k) step> (/tmp/python3-trepan/test/example/gcd.py:26): gcd -> 26 def gcd(a,b): a = 3 b = 3 (trepan3k)
Now if we want to continue execution to the return, run step<:
(trepan3k) step< step< (/tmp/python3-trepan/test/example/gcd.py:37 @62): gcd <- 37 return a R=> 3
Note that finish does the same thing as step< and might even be more reliable here.
For step>, break is sometimes better.
step # step 1 event, *any* event step 1 # same as above step 5/5+0 # same as above step line # step only line events step call # step only call events step> # same as above step call line # Step line *and* call events
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