[python] Working With Mathematical Operations and Permutations. 수학적 연산과 순열

[python] Working With Mathematical Operations and Permutations. 수학적 연산과 순열

 

https://blog.stackademic.com/ultimate-python-cheat-sheet-practical-python-for-everyday-tasks-c267c1394ee8

Ultimate Python Cheat Sheet: Practical Python For Everyday Tasks

 

1. Basic Arithmetic Operations
    To perform basic arithmetic:

sum = 7 + 3  # Addition
difference = 7 - 3  # Subtraction
product = 7 * 3  # Multiplication
quotient = 7 / 3  # Division
remainder = 7 % 3  # Modulus (Remainder)
power = 7 ** 3  # Exponentiation

 

2. Working with Complex Numbers
    To work with complex numbers:

z = complex(2, 3)  # Create a complex number 2 + 3j
real_part = z.real  # Retrieve the real part
imaginary_part = z.imag  # Retrieve the imaginary part
conjugate = z.conjugate()  # Get the conjugate

3. Mathematical Functions
    Common math functions:

import math
root = math.sqrt(16)  # Square root
logarithm = math.log(100, 10)  # Logarithm base 10 of 100
sine = math.sin(math.pi / 2)  # Sine of 90 degrees (in radians)

4. Generating Permutations
    Easy way to generate permutations from a given set:

from itertools import permutations
paths = permutations([1, 2, 3])  # Generate all permutations of the list [1, 2, 3]
for path in paths:
    print(path)

5. Generating Combinations
    Easy way to generate combinations:

from itertools import combinations
combos = combinations([1, 2, 3, 4], 2)  # Generate all 2-element combinations
for combo in combos:
    print(combo)

6. Random Number Generation
    To get a random number:

import random
num = random.randint(1, 100)  # Generate a random integer between 1 and 100

7. Working with Fractions
    When you need to work with fractions:

from fractions import Fraction
f = Fraction(3, 4)  # Create a fraction 3/4
print(f + 1)  # Add a fraction and an integer

8. Statistical Functions
   To get Average, Median, and Standard Deviation:

import statistics
data = [1, 2, 3, 4, 5]
mean = statistics.mean(data)  # Average
median = statistics.median(data)  # Median
stdev = statistics.stdev(data)  # Standard Deviation

9. Trigonometric Functions
    To work with trigonometry:

import math
angle_rad = math.radians(60)  # Convert 60 degrees to radians
cosine = math.cos(angle_rad)  # Cosine of the angle

10. Handling Infinity and NaN
    To work with Infinity and NaN:

import math
infinity = math.inf  # Representing infinity
not_a_number = math.nan  # Representing a non-number (NaN)