In python calculating equation for 2 yuan 1 time, the use of np, arrange, no results-CodePudding

 
For a np in arange (1, 10, 0.1) : 
A for b in np. Arange (1, 10, 0.1) : 
If a * 2 + b * 3==18.00: 
Print (a, b)

Only integer code as above, the theory is the result, but is allowed after the decimal, there is no result

CodePudding user response:

Floating point types of precision problem, computer storage floating-point number is error, when comparing floating-point Numbers usually does not directly using the==comparison,

Other python provides calculation and high precision method, such as:

 
The import numpy as np 
The from fractions import Fraction 
For a np in arange (1, 10, Fraction (1, 10)) : 
For b in np. Arange (1, 10, Fraction (1, 10)) : 
If a * b * 2 + 2==Fraction (18) : 
Print (float (a), the float (b))