python: traceback basics + raise from (beginner - intermediate) anthony explains #283

today I talk about tracebacks! how to read them, why python's are the right-side-up, and how `raise from` affects multi-tracebacks!

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[realvatican]

Tracebacks are very good for human readable bug solving, but what would be a good way to signal exceptional behaviour to a caller without exception handling; e.g. a command line python script that may be run as a step in a toolchain, like a windows .bat file? I guess there is no standard way and the errors you raise are based on whatever the caller is, which as a rule of thumb for python is more python code (so exceptions are the richest error feedback mechanism to the caller).

[d__priyanshuurwate]

thanks bro 4 ur video it really help me a lot😍

[behindyou]

hello sir i have a same problem Traceback with pandas library like
1.line 970, in _finalize_columns_and_data
columns = _validate_or_indexify_columns(contents, columns)
2. line 1018, in
raise AssertionError(
AssertionError: 12 columns passed, passed data had 17 columns
3. line 511, in nested_data_to_arrays
arrays, columns = to_arrays(data, columns, dtype=dtype)
4. line 876, in to_arrays
content, columns = _finalize_columns_and_data(arr, columns, dtype)
5. line 973, in _finalize_columns_and_data
raise ValueError(err) from err

and pandas\core\frame.py"
1. line 745, in __init__
arrays, columns, index = nested_data_to_arrays,

i am trying to do the data i have fetched with selenium, made to a table then i will download it to csv.
can you make a video tutorial on how to solve this.