


The
round() method returns the decimal point of the value rounded to n digits.
Syntax
The following is the syntax of the round() method:
round( x [, n] )
Parameters
x --This is a numerical value, indicating the value that needs to be formatted
n - -This is also a numerical value, indicating how many digits are retained after the decimal point
Return value
This method returns the decimal point of the value x rounded to n numbers
PS: round rounds the incoming data. If ngitits is not passed, the default is 0 (that is, the integer part is retained). When ngitits
Example
The following example shows the use of the round() method
#!/usr/bin/python2 print "round(80.23456, 2) : ", round(80.23456, 2) print "round(100.000056, 3) : ", round(100.000056, 3) print "round(-100.000056, 3) : ", round(-100.000056, 3)上 行 When we run the above program, it will produce the following results:
round(80.23456, 2) : 80.23 round(100.000056, 3) : 100.0 round(-100.000056, 3) : -100.0e
Python2 to enter the X Four House and Five to the latest multiple of 0 0 to 0 0 to the closest multiple of 0 0. , such as round(0.5)=1, round(-0.5)=-1;
#!/usr/bin/python2 print round(2.635, 2) print round(2.645, 2) print round(2.655, 2) print round(2.665, 2) print round(2.675, 2)
Output result:
2.63 2.65 2.65 2.67 2.67
round method defects
Through the above example, you can find that the rounding method of round looks like understand with us It's not the same. In fact, this is not a round bug. This mainly comes from the conversion of decimal to computer internal binary when inputting. Moreover, this problem cannot be solved with limited precision and does not need to be solved.
Python’s decimal module can be used to solve this problem.
If you don’t need to round, you can also consider using our most familiar print("%.2f" % 2.675) method.

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