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Python Introduction
Python Installation - Windows
Python Installation - Linux (Ubuntu)
Python Installation - Mac OS
Integrated Development Environment - IDE
Python - Basic Variables
Python - Sequence Introduction
Python - Output Formatting
Python - Escape Character
Python - Type Conversion
Python - Numbers
Python – Arithmetic Operators
Python – Assignment Operators
Python – Comparison Operators
Python – Logical Operators
Python – Ternary Operators
Python – Precedence and Associativity Operators
Python – Bytes Type and Usage
Python – Long & Raw Strings
Python – Concatenate Function
Python – Slice Function
Python – Length and Split Function
Python – Join and Count Function
Python – Find Function
Python – Index Function
Python – Alignment Function
Python – Startswith and Endswith Function
Python – String Case Conversion
Python – Remove Specified Character
Python – Encode and Decode Function
Python – dir and help Function
Python – Input Output Introduction
Python – Basic Operation
Python – Open Function
Python – Read Function
Python – Readline Function
Python – Write Function
Python – Close Function
Python – Seek and Tell Function
Python – Pickle Module
Python - File Input Module and Linecache Module
Python - Pathlib Module
Python - os.path Module
Python - fnmatch Module
Python - Tuple Introduction
Python - List Introduction
Python - List Add Element
Python - List Delete Element
Python - List Modification Element
Python - List Find Element
Python - Dictionary Introduction
Python - Dictionary Basic Operation
Python - Dictionary Method Guide
Python - Set Collection
Python - Set Basic Operation
Python - Set Basic Method
Python - Frozenset Method
Python - If Condition I
Python - If Condition II
Python - While loop
Python - For loop
Python - Pass Statement
Python - Break Statement
Python - Zip Reverse Function
Python - Function Introduction
Python - Positional Parameters
Python - Key Arguments
Python - None and Return
Python - Variable Scope
Python - Local Function
Python - Closure Method
Python - Lamdba Expression
Other Exercises:
Python String Exercises
Python List Exercises
Python Library Exercises
Python Sets Exercises
Python Array Exercises
Python Condition Statement Exercises
Python Lambda Exercises
Python Function Exercises
Python File Input Output Exercises

Arithmetic operators are also mathematical operators used to perform mathematical operations on numbers, such as addition, subtraction, multiplication, and division. The following table lists all the basic arithmetic operators supported by Python.

Arithmetic Operators | Explanation |
---|---|

+ | Addition |

- | Subtraction |

* | Multiplication |

/ | Division (same rules in mathematics) |

// | Division but retain only the integer part of the quotient |

% | Take the remainder of the division |

** | Power operation which returns a to the power of b |

Let’s continue to explain each arithmetic operator in detail.

The addition operator is very simple, and like the rules in mathematics, look at the following code:

m = 12 n = 56 sum_1 = m + n x = 5.2 y = 35.3 sum_2 = x + y print("sum_1=%d, sum_2=%.2f" % (sum_1, sum_2) )

The output is:

sum_1=68, sum_2=40.50

When + is used for numbers, it means addition, but when + is used for strings, it also has the function of concatenating strings (concatenating two strings into one), please see the code:

name = "Free Learning Points" age = 8 info = name + " is " + str (age) + " years old." print (info)

The output is:

Free Learning Points is 8 years old.

The str () function is used to convert an integer age to a string.

The subtraction operation is also the same as the rules in mathematics, please see the code:

d = 35 m = -d x = -85.7 y = -x print(m, ",", y)

The output is:

-35 , 85.7

Negative number:

In addition to being used for subtraction, it can also be used for negative operations (positive numbers become negative numbers, negative numbers become positive numbers), please see the following code:

d = 85 d_neg = -d f = -73.2 f_neg = -f print(d_neg, ",", f_neg)

The output is:

-85 , 73.2

Note that using + alone is invalid and does not change the value of the number, for example:

d = 85 m = +d x = -73.2 y = +x print(m, ",", y)

The output is:

-85 , 73.2

Multiplication is also the same as the rules in mathematics, please see the code:

d = 3 * 26 f = 32.6 * 3 print(d, ",", f)

The output is:

78 , 97.80000000000001

In addition to being used for multiplication, it can also be used to repeat strings, that is, to concatenate n identical strings, please see the code:

str1 = "welcome" print(str1 * 3)

The output is:

welcomewelcomewelcome

Python supports the two division operators / and //, but there are differences between them:

a. / Indicates ordinary division, and the result calculated using it is the same as that in mathematics.

b. // means divisible, only the integer part of the result is retained, the decimal part is discarded; note that the decimal part is directly discarded, not rounded.

For example:

print ("27/5 =", 27/5) #Normal mathematics division print ("27 // 5 =", 27//5) #Integer can be divided but with remainder print ("27.0 // 5 =", 27.0//5) print ("35/5 =", 35/5) #Normal mathematics division print ("35 // 5 =", 35//5) print ("35.0 // 5 =", 35.0//5) print ("12.3 / 2.5 =", 12.3/2.5) #Decimal division print ("12.3 // 2.5 =", 12.3//2.5) #Decimal division

The output is:

27/5 = 5.4

27 // 5 = 5

27.0 // 5 = 5.0

35/5 = 7.0

35 // 5 = 7

35.0 // 5 = 7.0

12.3 / 2.5 = 4.92

12.3 // 2.5 = 4.0

It can be found from the above results:

The result of / is always a decimal, regardless of whether it can be divided, or whether it is an integer or a decimal. When a decimal is involved in the operation, // the result is a decimal, otherwise it is an integer.

should be noted that the divisor cannot always be 0, and it is meaningless to divide by 0, which will cause ZeroDivisionError. In some programming languages, the result of dividing by 0 is infinity (both positive and negative infinity).

The Python% operator is used to find the remainder when two numbers are divided, including integers and decimals. Python divides the first number by the second number to get the quotient of an integer, and the remaining value is the remainder. For decimals, the result of the remainder is usually a decimal.

Note that the essence of the remainder operation is division, so the second number cannot be 0, otherwise it will cause a ZeroDivisionError error.

For example:

print ("----- Integer remainder -----") print ("25% 3=", 25% 3) print ("-25% 3 =", -25% 3) print ("25% -3 =", 25% -3) print ("-25% -3 =", -25% -3)

The output is:

27/5 = 5.4

27 // 5 = 5

27.0 // 5 = 5.0

35/5 = 7.0

35 // 5 = 7

35.0 // 5 = 7.0

12.3 / 2.5 = 4.92

12.3 // 2.5 = 4.0

print ("----- decimal remainder -----") print ("9.7% 2.3 =", 9.7% 2.3) print ("-9.7% 2.3 =", -9.7% 2.3) print ("9.7% -2.3 =", 9.7% -2.3) print ("-9.7% -2.3 =", -9.7% -2.3)

The output is:

----- decimal remainder -----

9.7% 2.3 = 0.5

-9.7% 2.3 = 1.7999999999999998

9.7% -2.3 = -1.7999999999999998

-9.7% -2.3 = -0.5

print ("--- Integer and decimal operations ---") print ("22.7% 6 =", 22.7% 6) print ("22% 7.5 =", 22% 7.5) print ("22.7% -6 =", 22.7% -6) print ("-22.7% 6.5 =", -22.7% 6.5) print ("-22.7% -6.5 =", -22.7% -6.5)

The output is:

--- Integer and decimal operations ---

22.7% 6 = 4.699999999999999

22% 7.5 = 7.0

22.7% -6 = -1.3000000000000007

-22.7% 6.5 = 3.3000000000000007

-22.7% -6.5 = -3.1999999999999993

Two points can be found from the results:

a. The result of the remainder will be negative only when the second number is negative. In other words, the sign of the remainder is not related to the first number, it is only determined by the second number.

b. When the numbers on both sides are integers, the result of the remainder is also an integer; but if one number is a decimal, the result of the remainder is a decimal.

The Python ** operator is used to find an x to the power of y, which is the power operator. Since the square is the inverse of the power, the square root can also be implemented indirectly using the ** operator.

For example:

print ('---- Power operation ----') print ('2 ** 4 =', 2 ** 4) print ('3 ** 6 =', 3 ** 6)

The output is:

---- Power operation ----

2 ** 4 = 16

3 ** 6 = 729

print ('---- Square root operation ----') print ('71 ** (1/4) = ', 71 ** (1/4)) print ('30 ** (1/5) = ', 30 ** (1/5))

The output is:

---- Square root operation ----

71 ** (1/4) = 2.9027831081870996

30 ** (1/5) = 1.97435048583482

More Tutorials:

Python Installation - Linux (Ubuntu)Python Installation - Mac OS

Integrated Development Environment - IDE

Python - Basic Variables

Python - Sequence Introduction

Python - Output Formatting

Python - Escape Character

Python - Type Conversion

Python - Numbers

Python – Arithmetic Operators

Python – Assignment Operators

Python – Comparison Operators

Python – Logical Operators

Python – Precedence and Associativity Operators

Python – Bytes Type and Usage

Python – Long & Raw Strings

Python – Concatenate Function

Python – Slice Function

Python – Length and Split Function

Python – Join and Count Function

Python – Find Function

Python – Index Function

Python – Alignment Function

Python – Startswith and Endswith Function

Python – String Case Conversion

Python – Remove Specified Character

Python – Encode and Decode Function

Python – dir and help Function

Python – Input Output Introduction

Python – Basic Operation

Python – Open Function

Python – Read Function

Python – Readline Function

Python – Write Function

Python – Close Function

Python – Seek and Tell Function

Python – Pickle Module

Python - File Input Module and Linecache Module

Python - Pathlib Module

Python - Pathlib Module

Python - os.path Module

Python - fnmatch Module

Python - Tuple Introduction

Python - List Introduction

Python - List Add Element

Python - List Delete Element

Python - List Modification Element

Python - List Find Element

Python - Dictionary Introduction

Python - Dictionary Basic Operation

Python - Dictionary Method Guide

Python - Set Collection

Python - Set Basic Operation

Python - Set Basic Method

Python - Frozenset Method

Python - If Condition I

Python - If Condition II

Python - While loop

Python - For loop

Python - Pass Statement

Python - Break Statement

Python - Zip Reverse Function

Python - Function Introduction

Python - Positional Parameters

Python - Key Arguments

Python - None and Return

Python - Variable Scope

Python - Local Function

Python - Closure Method

Python - Lamdba Expression

More Python Exercises:

Python String ExercisesPython List Exercises

Python Library Exercises

Python Sets Exercises

Python Array Exercises

Python Condition Statement Exercises