02Python common modules _ 01 math, 02python_01math

02Python common modules _ 01 math, 02python_01math
1. Integer:

>>> Import math >>> math. ceil (2.3) # rounded up 3 >>> math. floor (2.7) # rounded down 2 >>> round (2.3) # rounded down 2
>>> Round (2.12345, 3)
2.123

2. trigonometric function:

Math. cos (x) math. sin (x) math. tan (x) # The return value is the number of radians math. acos (x) math. asin (x) math. atan (x) math. degrees (x) # radians to angle math. radians (x) # degrees to radians

3. logarithm & Index:

Math. exp (3) # e ^ xmath. pow (x, y) # x ^ y ''' In particle, pow (1.0, x) and pow (x, 0.0) always return 1.0, even when x is a zero or a NaN. '''math. sqrt (x) # The 2nd power math of x. log (2, 4) # log4 (2) math. log10 (3) # equivalent to math. log (3, 10)

4. Constant:

Math. pi # π math. e # emath. inf # + ∞, equivalent to float ('inf ')