Basic knowledge of python 04 basic knowledge of mathematics
The basic knowledge of three numbers in the course
Python console can be executed as a calculator to perform arithmetic such as [root@flink-slave5] # ipythonPython 3.7.4 (default, Aug 13 2019, 20:35:49) Type 'copyright',' credits' or 'license' for more informationIPython 7.8.0-- An enhanced Interactive Python in the python console. Type'?' For help.In [1]: 2 + 3 Out [1]: 5In [2]: 2 + 3 * 2 Out [2]: 8 supports addition, subtraction, multiplication and division. Focus on the division because except for some special * (base) C:\ Users\ Administrator > pythonPython 3.7.3 (default) Mar 27 2019, 17:13:21) [MSC v.1915 64 bit (AMD64)]:: Anaconda, Inc. On win32Type "help", "copyright" "credits" or "license" for more information. > > 2 + 3 * 517 > 5.3/22.65In [1]: 5 / 2 Out [1]: 2.5In [2]: 5 / / 2 Out [2]: 2In [3]: 4 / 2 Out [3]: 2.0In [4]: 4 / / 2 Out [4]: 2 Out / Division (/) both numerator and denominator results in floating-point numbers The characteristic of the first knowledge point positive division operator (/ /) py is that it only takes the integer part > 5Compact 22 > 4Compact 22 > / if the integer is divisible (both the numerator and denominator are integers), then the result is an integer if only one of the numerators and denominators is a floating point number, but the result is floating point number > > 5.2pm 22.0. Note: in py, only integer and floating point power operators (* *) > the third power of integer and floating point operators (%) / / the remainder (%) / / can be taken from both integers and floating point numbers > 5Compact 22.5 > 5% 21 > 5.2%21.2000000000000002python supports / / +-* /% / * * ()-3 / / represents the symbol in negative 3python. Parentheses second exponentiation third sign (-) fourth * / /% fifth +-example: # coding:utf-8print (2 + 4) print (12654) print (20 + 4 * 5) print ((20 + 4) * 5) print (4x2) print (4Univer 2) print (3Univer 2) print (3lap2) print (5. 2) print (5.2) print (4) print (3 + 2 *-3 * * 3-- 3 * * 2) x = 4y = 5l = 2.4print (x + y * l) / / the result is 6-528401202.0211.562.0256-4216.0
