Writing to standard output

[marcverhagen]

There are many occasions where TTK writes to standard output. This is not a good idea when you use the --pipe option. Printing to stdout is okay when processing a directory, but printing to stdout in standard file or pipe processing should be eliminated.

Find all those occasions and replace them with calls to the logger or write to stderr.

[marcverhagen]

This was fixed for a line in components/common_modules/tree.py (which contained the print statement that first alerted us to this problem).

[marcverhagen]

Removed writing error report to stdout in commit https://github.com/tarsqi/ttk/commit/7cc7060facc7fe20aa3c80353ccd383eb144ea1e.

[marcverhagen]

Checked all print statements in the code and removed the dangerous ones or replaced them with calls to the logger. Print statements were allowed on some spots:

• high level routines that are not executed when we run in --pipe mode
• pretty print methods that are used for debugging
• scripts that call tarsqi.py, like the evaluation scripts
• all print statements that are conditional on a debugging variable

[marcverhagen]

Fixed in a9662a1.