11 "Python" Posts

Modeling Heat Capacity and Evaporation with Python: Why Water Warms Slowly but Cools Fast

Using thermodynamics and Python to explain why pools resist daytime warming but lose heat rapidly at night
What You'll Learn
  • Why water’s high specific heat makes a swimming pool warm much more slowly than the surrounding air
  • Why evaporation can remove heat from water faster than sunlight replaces it
  • How convection, radiation, solar absorption, and evaporation combine in a surface energy balance
  • How to translate conservation of energy into a Python model of water temperature
  • Why covering a pool can dramatically reduce nighttime heat loss
  • How simulation can reveal the effects of weather, geometry, and surface conditions on water temperature

Numeric Parsing in Python with Integer Division and Modulus

Using // and % to split fixed-width numeric data without converting it to strings
What You'll Learn
  • When numeric parsing is a better choice than converting numbers to strings
  • How integer division removes digits from the right side of a number
  • How modulus extracts the rightmost digits from a number
  • How to split fixed-width numeric codes into meaningful fields
  • How // and % naturally break timestamps into hours, minutes, seconds, and milliseconds
  • How to process individual digits numerically for algorithms such as checksums

Using SymPy in Python When NumPy Isn't Enough

Choosing exact symbolic mathematics when floating-point approximations are not good enough
What You'll Learn
  • Why floating-point numbers cannot represent many ordinary decimal values exactly
  • How SymPy keeps rational values exact instead of introducing floating-point approximations
  • When tolerance checks such as math.isclose are appropriate and when exact math matters
  • How symbolic computation can calculate derivatives and solve equations without numerical approximation
  • When SymPy is a better choice than NumPy for a mathematical problem
  • How SymPy and NumPy complement each other as tools for precision and performance