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Python debugging tips [closed]
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PDB
You can use the pdb module, insert pdb.set_trace() anywhere and it will function as a breakpoint.
>>> import pdb
>>> a="a string"
>>> pdb.set_trace()
--Return--
> <stdin>(1)<module>()->None
(Pdb) p a
'a string'
(Pdb)
To continue execution us...
undefined reference to `__android_log_print'
What is wrong with my make file?
15 Answers
15
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How to get string objects instead of Unicode from JSON?
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A solution with object_hook
import json
def json_load_byteified(file_handle):
return _byteify(
json.load(file_handle, object_hook=_byteify),
ignore_dicts=True
)
def json_loads_byteified(json_text):
return _...
What is the best method to merge two PHP objects?
...ay) $obj2);
This actually also works when objects have methods. (tested with PHP 5.3 and 5.6)
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What is the effect of extern “C” in C++?
...le that contains just the declaration of your function. Your function definition is contained in a binary format (that was compiled by your C++ compiler) that the client C linker will then link to using the C name.
Since C++ has overloading of function names and C does not, the C++ compiler cannot j...
Weird PHP error: 'Can't use function return value in write context'
I'm getting this error and I can't make head or tail of it.
12 Answers
12
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How to add column if not exists on PostgreSQL?
...D;
$$
You can't pass these as parameters, you'll need to do variable substitution in the string on the client side, but this is a self contained query that only emits a message if the column already exists, adds if it doesn't and will continue to fail on other errors (like an invalid data type).
I ...
How to implement the --verbose or -v option into a script?
... than putting the if in the function, which you might be tempted to do, do it like this:
if verbose:
def verboseprint(*args):
# Print each argument separately so caller doesn't need to
# stuff everything to be printed into a single string
for arg in args:
prin...
TypeError: Missing 1 required positional argument: 'self'
I am new to python and have hit a wall. I followed several tutorials but cant get past the error:
6 Answers
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back button callback in navigationController in iOS
...hed a view onto the navigation controller and when I press the back button it goes to the previous view automatically. I want to do a few things when back button is pressed before popping the view off the stack. Which is the back button callback function?
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