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gh-86690: Add `retval [variable]` option to pdb by romuald · Pull Request #23601 · python/cpython · GitHub

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gh-86690: Add retval [variable] option to pdb #23601

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gh-86690: Add retval [variable] option to pdb #23601

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14 changes: 11 additions & 3 deletions Lib/pdb.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1149,11 +1149,19 @@ def do_args(self, arg):
do_a = do_args

def do_retval(self, arg):
"""retval
Print the return value for the last return of a function.
"""retval [variable]
Print or store the return value for the last return of a function.

When used without argument, prints the return value

When used with an argument, store the return value into a local variable

"""
if '__return__' in self.curframe_locals:
self.message(repr(self.curframe_locals['__return__']))
if arg:
self.curframe_locals[arg] = self.curframe_locals['__return__']
else:
self.message(repr(self.curframe_locals['__return__']))
else:
self.error('Not yet returned!')
do_rv = do_retval
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7 changes: 6 additions & 1 deletion Lib/test/test_pdb.py
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Expand Up @@ -106,6 +106,8 @@ def test_pdb_basic_commands():
... 'jump 8', # jump over second for loop
... 'return', # return out of function
... 'retval', # display return value
... 'retval v1', # stores the return value in "v1" local variable
... 'v1', # display the "v1" stored variable
... 'next', # step to test_function3()
... 'step', # stepping into test_function3()
... 'args', # display function args
Expand Down Expand Up @@ -139,7 +141,7 @@ def test_pdb_basic_commands():
[EOF]
(Pdb) bt
...
<doctest test.test_pdb.test_pdb_basic_commands[4]>(25)<module>()
<doctest test.test_pdb.test_pdb_basic_commands[4]>(27)<module>()
-> test_function()
<doctest test.test_pdb.test_pdb_basic_commands[3]>(3)test_function()
-> ret = test_function_2('baz')
Expand Down Expand Up @@ -184,6 +186,9 @@ def test_pdb_basic_commands():
-> return foo.upper()
(Pdb) retval
'BAZ'
(Pdb) retval v1
(Pdb) v1
'BAZ'
(Pdb) next
> <doctest test.test_pdb.test_pdb_basic_commands[3]>(4)test_function()
-> test_function3(kwonly=True)
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2020-12-01-16-17-13.bpo-42524.lHDAP6.rst
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@@ -0,0 +1 @@
Add `retval [variable]` option to pdb
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