9. 숫자와 수학 모듈
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The modules described in this chapter provide numeric and math-related
functions and data types. The "numbers" module defines an abstract
hierarchy of numeric types. The "math" and "cmath" modules contain
various mathematical functions for floating-point and complex numbers.
For users more interested in decimal accuracy than in speed, the
"decimal" module supports exact representations of decimal numbers.

이 장에는 다음과 같은 모듈이 설명되어 있습니다:

* 9.1. "numbers" --- 숫자 추상 베이스 클래스

  * 9.1.1. 숫자 계층

  * 9.1.2. 형 구현을 위한 주의 사항

    * 9.1.2.1. 더 많은 숫자 추상 베이스 클래스(ABC) 추가

    * 9.1.2.2. 산술 연산 구현

* 9.2. "math" --- Mathematical functions

  * 9.2.1. Number-theoretic and representation functions

  * 9.2.2. Power and logarithmic functions

  * 9.2.3. Trigonometric functions

  * 9.2.4. Angular conversion

  * 9.2.5. Hyperbolic functions

  * 9.2.6. Special functions

  * 9.2.7. Constants

* 9.3. "cmath" --- Mathematical functions for complex numbers

  * 9.3.1. Conversions to and from polar coordinates

  * 9.3.2. Power and logarithmic functions

  * 9.3.3. Trigonometric functions

  * 9.3.4. Hyperbolic functions

  * 9.3.5. Classification functions

  * 9.3.6. Constants

* 9.4. "decimal" --- Decimal fixed point and floating point
  arithmetic

  * 9.4.1. Quick-start Tutorial

  * 9.4.2. Decimal objects

    * 9.4.2.1. Logical operands

  * 9.4.3. Context objects

  * 9.4.4. Signals

  * 9.4.5. Floating Point Notes

    * 9.4.5.1. Mitigating round-off error with increased precision

    * 9.4.5.2. Special values

  * 9.4.6. Working with threads

  * 9.4.7. Recipes

  * 9.4.8. Decimal FAQ

* 9.5. "fractions" --- Rational numbers

* 9.6. "random" --- Generate pseudo-random numbers

* 9.7. "itertools" --- Functions creating iterators for efficient
  looping

  * 9.7.1. Itertool functions

  * 9.7.2. Recipes

* 9.8. "functools" --- Higher-order functions and operations on
  callable objects

  * 9.8.1. "partial" Objects

* 9.9. "operator" --- Standard operators as functions

  * 9.9.1. Mapping Operators to Functions
