Quote:
Originally Posted by psbasha
Could you please help me.How to use this module for debugging the application functionality thru UI as entry point?
Thanks
PSB
if you are using a UI, your UI should come with debugging facilities. Even Pythonwin or IDLE does a bit of debugging for you. this pdb module is sort of command line debugging. Here's a simple guide on how to use it.
imagine you have this code:
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import pdb,sys
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def afunc():
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a = 1
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b = 2
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c = a+b
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return a,b,c
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pdb.set_trace() #put the trace starting here.
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a = 100
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b = 200
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d = afunc()
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sys.exit()
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output:
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# ./test1.py
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> /test/test1.py(13)?()
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-> a = 100
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(Pdb) n
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> /test/test1.py(14)?()
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-> b = 200
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(Pdb) n
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> /test/test1.py(15)?()
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-> d = afunc()
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(Pdb) s
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--Call--
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> /test/test1.py(6)afunc()
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-> def afunc():
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(Pdb) n
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> /test/test1.py(7)afunc()
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-> a = 1
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(Pdb) n
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> /test/test1.py(8)afunc()
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-> b = 2
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(Pdb) n
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> /test/test1.py(9)afunc()
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-> c = a+b
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(Pdb) n
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> /test/test1.py(10)afunc()
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-> return a,b,c
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(Pdb) p c
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3
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(Pdb) n
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--Return--
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> /test/test1.py(10)afunc()->(1, 2, 3)
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-> return a,b,c
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(Pdb) n
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> /test/test1.py(17)?()
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-> sys.exit()
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(Pdb) p d
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(1, 2, 3)
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(Pdb) n
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SystemExit: None
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> /test/test1.py(17)?()
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-> sys.exit()
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once the script executes, you go to the debug prompt. type 'h' for a list of commands you can use to debug. most common ones I use are s,l, h, p , n. 'l' shows you where you are now, 'p' prints out values of variables , 'n' means next step. 's' means if you hit a function, you step into that function.
Noticed when i hit the afunc() functoin, i use s to step into it. then i continue with 'n' . when when it reaches c=a+b, i hit 'n' to execute it, then i do a 'p c' to print the value of c. After the return , i did another 'p d' to print the value of the afunc(), which is a tuple. Well, this is very short, please go experiment it yourself. there's always google if you need more resources.
