NullDev questions

NullDev answers

• Subtract last and first elements in a column using Python Pandas
• Maintaining proportionality of sum constrained row when changing a single row value
• Python web scraping involving HTML a tag
• How to get rows from numpy 2d where column value is maximum from group by other column?
• Installed pygraphviz on Windows 7, but unable to import it; can't find _graphviz
• Emptying specific cells in the same row of an amended cell
• Python beautifulsoup level 1 only text
• Generating a list of dates given the start and end dates
• Excel VBA: Paste problems
• Can I make this macro more efficient or faster?