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I have a number like 2.32432432423e25 in python that is the result of a computation.
I want to round this to 3 decimal points to get the output:
2.324e25 I have tried to use:
x = 2.32432432423e25 number_rounded = round(x, 3) But when I print number_rounded it outputs a number with the same format as x.
How do I limit the display of x to just 4 significant digits?
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Use the round() Function to Round a Number to the Given Significant Digit in Python. The round() function rounds the given floating values to the nearest integer or specified decimal position. We can use a negative number to round the integer to the significant floor value by assigning it to the round() function.
For the most accurate result, you should always round after you preform the arithmetic if possible. When asked to do arithmetic and present you answer rounded to a fixed number of decimal places, only round after performing the arithmetic. Round the answer to 2 decimal places.
To round to the nearest whole number in Python, you can use the round() method. You should not specify a number of decimal places to which your number should be rounded. Our Python code returns: 24. The round() function is usually used with floating-point numbers, which include decimal places.
5 is round up for positive values and round down for negative values. For instance, both round(0.5) and round(-0.5) return 0 , while round(1.5) gives 2 and round(-1.5) gives -2 . This Python behaviour is a bit different from how rounding usually goes.
The scientific notation means any number expressed in the power of 10.for example- 340 can be written in scientific notation as 3.4 X10 2 .in pythons, we use str.format () on a number with “ {:e}” to format the number to scientific notation. str.format () formats the number as a float, followed by “e+” and the appropriate power of 10.
In Python there is a built-in round () function which rounds off a number to the given number of digits. The function round () accepts two numeric arguments, n and n digits and then returns the number n after rounding it to n digits.
The round () function rounds the given floating values to the nearest integer or specified decimal position. We can use a negative number to round the integer to the significant floor value by assigning it to the round () function. This negative number to be specified depends on the required significant digits.
There is a simple technique to suppress scientific notation when using float values by using the %f flag in string. This will convert the number into a floating-point number and then print it. Note that this method has a precision of 10^-6 only.
You'll need to use string formatting for this:
'{:0.3e}'.format(2.32432432423e25)
The reason is that round is for specifying the number of the digits after the ones place, which is not really relevant when your numbers are O(25).
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