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Summary

In this chapter, you learned how to use the Python REPL, also called the Python prompt, to solve problems. You learned how to do arithmetic, powers and logarithms, trigonometry and save values to variables. Operations on strings were introduced including concatenation and comparison. In the last section of the chapter, Python's print() function was introduced.

Key Terms and Concepts

REPL

Python REPL

Python Prompt

prompt

Python Interpreter

interpreter

operator

mathematical operator

import

module

Python Standard Library

Standard Library

syntax

functions

command line

error

variable

assignment operator

comparison operator

concatenate

equivalent

index

indexing

slicing

Summary of Python Functions and Commands

Below is a summary of the functions and operators used in this chapter:

Arithmetic

Arithmetic Operator	Description
`+`	addition
`-`	subtraction
`*`	multiplication
`/`	division
`**`	exponents
`_`	answer in memory

Trigonometry

Trig Function	Description
`from math import *`
`sin`	sine of angle in radians
`cos`	cosine of angle in radians
`tan`	tangent of angle in radians
`pi`	$\pi$
`degrees`	convert radians to degrees
`radians`	convert degrees to radians
`asin`	inverse sine
`acos`	inverse cosine
`atan`	inverse tangent

Logarithms and Exponents

Logarithms and Exponent Function	Description
`from math import *`
`log`	log base e, natural log
`log10`	log base 10
`exp`	$e^{power}$
`e`	the math constant $e$
`pow(x,y)`	x raised to the y power
`sqrt`	square root

Statistics

Statistics Function	Description
`from statistics import *`
`mean`	mean (average)
`median`	median (middle value)
`mode`	mode (most often)
`stdev`	standard deviation of a sample
`pstdev`	standard deviation of a population