python round to 2 decimal places

Python retains two decimal places:In [1]: a = 5.026In [2]: b = 5.000In [3]: Round (a,2) out[3]: 5.03In [4]: Round (b,2) out[4]: 5.0In [5]:'%.2f'%aout[5]:'5.03'In [6]:'%.2f'%bout[6]:'5.00'In [7]: Float ('%.2f'%a) out[7]: 5.03In [8]: Float ('%.2f'%b)

I ran into a problem today when I wrote the program. about how to control floating-point numbers only two digits after the decimal point, the normal idea is to use the round function, such as round (A, 2), but in the face of the following problems

The Python version also affects the results, and python2 the x round to the nearest multiple from 0, such as round (0.5) =1, round (-0.5) =-1; Python3 rounds x to the nearest number of even multiples, such as round (0.5) =0, round (1.5) =2.0, round (

Python built-in functions (55) -- round, python built-in 55 round English document: round( Number[, Ndigits]) Return the floating point value NumberRounded NdigitsDigits after the decimal point. If NdigitsIs omitted, it

Https://www.cnblogs.com/herbert/p/3402245.htmlBasisThe floating-point number is represented by the machine's double-precision (a-bit) of the floating-point number. provides approximately 17 bits of precision and ranges from 308 to 308 of the

In python, round (x, [n]) uses round (x, [n]) to rounding n to retain the number of fractional parts 1. when n is not entered, the default value is 0, that is, the fractional part is not retained.A. When the decimal part is only 0.5, if the integer

BasisThe floating-point number is represented by the machine's double-precision (a-bit) of the floating-point number. provides approximately 17 bits of precision and ranges from 308 to 308 of the exponent. Same as the double type in the C language.

It is the result of Lua's computation. We can see that the computation result is very accurate. It is the calculation result of Python3. We can see that the calculation result is inaccurate: the decimal computation in JavaScript is also inaccurate.

English documents: round (number[, ndigits]) Return The floating point value number rounded to ndigits digits after the decimal point. If ndigits is omitted, it returns the

Detailed explanation of the basic mathematical computing usage in Python programming, detailed explanation of python programming mathematics QuantityIn Python, the provisions on logarithm are relatively simple and can be understood basically at the