Python Cheat Sheet - GeoCities Style

Math Operations

Get ready for some calculations!

Operation	Description	Result
`a = 3` `b = 4`
`a + b`	Sum of a and b	(7)
`a - b`	Subtract b from a	(-1)
`a * b`	a times b	(12)
`a / b`	a divided by b	(0.75)
`a // b`	Integer part of a divided by b	(0)
`a % b`	Rest of a divided by b	(3)
`a ** b`	a to the power of b	(81)

Logic Tests

Pay attention to these!

Test	Description	Result
`5 > 3`	Tests if 5 is greater than 3	True
`5 >= 3`	Tests if 5 is greater than or equal to 3	True
`5 == 3`	Tests if 5 is equal to 3	False
`5 != 3`	Tests if 5 is different than 3	True
`5 <= 3`	Tests if 5 is lower than or equal to 3	False
`5 < 3`	Tests if 5 is lower than 3	False
`not True`	Opposite of True	False

Math Module

Computer Import module: import math

Function	Description
`math.ceil(x)`	Rounds x up
`math.floor(x)`	Rounds x down
`round(x)`	1 Rounds x with 0 decimal places
`round(x, 2)`	Rounds x with 2 decimal places
`math.sqrt(x)`	Square root of x
`math.sin(angle)`	Sine of angle
`math.cos(angle)`	Cosine of angle
`math.tan(angle)`	Tangent of angle
`math.sinh(x)`	Hyperbolic sine of x
`math.cosh(x)`	Hyperbolic cosine of x
`math.tanh(x)`	Hyperbolic tangent of x
`math.asin(angle)`	Arc sine of angle
`math.acos(angle)`	Arc cosine of angle
`math.atan(angle)`	Arc tangent of angle
`math.asinh(x)`	Inverse hyperbolic sine of x
`math.acosh(x)`	Inverse hyperbolic cosine of x
`math.atanh(x)`	Inverse hyperbolic tangent of x
`math.degrees(angle)`	Convert angle from radians to degrees
`math.radians(angle)`	Convert angle from degrees to radians
`math.factorial(x)`	Factorial of x
`math.gamma(x)`	Gamma function of x
`math.exp(x)`	e to the power of x
`math.log(x)`	Natural logarithm of x
`math.log(x, 2)`	Base 2 logarithm of x
`math.e`	Constant e
`math.pi`	Constant pi

1 `round()` is not part of the `math` module.

2 The Python standard is to work with angles in radians.

Second Degree Equation Roots

# This script solves ax^2 + bx + c = 0

import math
a = 1
b = -1
c = -6
delta = b**2 - 4*a*c
r1 = (-b + math.sqrt(delta))/(2*a)
r2 = (-b - math.sqrt(delta))/(2*a)
print(f"r1 = {r1}")
print(f"r2 = {r2}")

Results: