Concerned_Citizen questions

• Why does 'append' mutates all elements in a list? [duplicate]
• Python Syntax Highlighting in Notepad++
• R Code Taking Too Long To Run
• Capturing String Right Before Comma in Regex
• "not all arguments converted during string formatting" Python Django
• Are built-in functions in R usually optimized?
• Plotting in R; cannot be coerced to double error
• Negative subscripts error in R
• Set a Column in Pivot Table as Percentage of Another
• Show/Change Work Directory in SQLite

Concerned_Citizen answers