Craig questions

Craig answers

• Dot graph generation "triangulation failed"
• graphviz three ranks layout with subgraphs
• remove curly brace in field
• Why I can't use join for a list of objects that implement __str__?
• Match unescaped quotes in quoted csv
• boolean operation with groupby in pandas
• superimpose matplotlib quiver on image
• how to set Xticks according to key from a dictionary
• scipy interp1d extrapolation method fill_value = tuple not working
• Best Fit Line on Log Log Scales in python 2.7