Python operators and common data type conversions

Nine. Operators1. Arithmetic Operators

operator	Description	Example
+	Add	Two objects added a + B output result 30
-	Reducing	Get negative numbers or a number minus another number A-B output 10
*	By	Two number multiplied or returns a string that is repeated several times a * b output result 200
/	Except	B/A Output Results 2
//	Take the Divide	Returns the integer portion of the quotient 9//2 output result 4, 9.0//2.0 output 4.0
%	Take surplus	Returns the remainder of division B% A output result 0
**	Index	A**b is 10 of 20, output 100000000000000000000

Note: When blending operations, the order of precedence is: ** higher * / % // + than c25> - , in order to avoid ambiguity, it is recommended () to use 0 to handle operator precedence.

Also, when different types of numbers are mixed, the integers are converted to floating point numbers for operation.

#+ Add two objects add a + b output result#Minus a negative number or one number minus the other. A-B output result -10#* Multiply by two number or return a string that is repeated several times a * b output result#/except b/a output result 2#Please enter the first number a:a = Int (input ("Please enter the first number a:")) b= Int (Input ("Please enter a second number B:"))#additionRet1 = A +bPrint("Result of addition operation:%d"%Ret1)#SubtractionRet2 = A-bPrint("subtraction Result:%d"%Ret2)#multiplicationRet3 = A *bPrint("multiplication Result:%d"%Ret3)#DivisionRet4 = A/bPrint("Division Result:%d"%ret4)#//Take the integer portion of the returned quotient 9//2 the output result 4, 9.0//2.0 the output 4.0#% of remainder returns division B% A output result 0#* * Index A**B is 10 of 20, output results 0000 0000 0000 0000NUM1 = 10num2= 2#Take the DivideRET5 = NUM1//num2Print(RET5)#Take surplusRet6 = num1%num2Print(RET6)#IndexRet7 = 10**2Print(RET7)Print(Type (RET7))

2. Assignment Operators 1) Assignment operator:

operator	Description	Example
=	Assignment operators	Assigns the result to the right of the = number to the left variable, such as num = 1 + 2 * 3, and the result Num has a value of 7

2) Compound assignment operator

operator	Description	Example
+=	Addition assignment operator	c + = A is equivalent to C = C + A
-=	Subtraction assignment operator	C-= A is equivalent to C = c-a
*=	Multiplication assignment operator	C *= A is equivalent to C = c * A
/=	Division assignment operator	C/= A is equivalent to C = c/a
%=	Modulo assignment operator	C%= A is equivalent to C = c% A
**=	Power assignment operator	C * *= A is equivalent to C = C **a
//=	Take the divisible assignment operator	C//= A is equivalent to C = c//A

#+ = addition Assignment operator C + = A is equivalent to C = C + a#- = Subtraction assignment operator C-= A is equivalent to C = c-a#*= multiplication assignment operator C *= A is equivalent to C = c * a#/= Division assignment operator C/= A is equivalent to C = c/a#%= modulo assignment operator C%= A is equivalent to C = c% a#**= Power assignment operator C **= A is equivalent to C = c * * A#//=-divisible assignment operator C//= A is equivalent to C = c//aa= 10b= 20C= A +b#addition, commonly usedRet1 = A +bPrint(RET1) a= A +BA+=b#Get 30 ResultsB + =aPrint(b)#SubtractionA-=BB-=aPrint(b)#multiplicationA *=bPrint(a)#DivisionA/=bPrint(a)

10. Common Data type Conversions

function	Description
int (x [, Base])	Convert x to an integer
Float (x)	Convert x to a floating-point number
Complex (real [, Imag])	Create a complex number, real is the real part, Imag is the imaginary part
STR (x)	Convert an object x to a string
REPR (x)	Convert an object x to an expression string
eval (str)	Used to evaluate a valid Python expression in a string and return an object
Tuple (s)	Converting a sequence s to a tuple
List (s)	Convert the sequence s to a list
Chr (x)	Converts an integer to a Unicode character
Ord (x)	Converts a character to its ASCII integer value
Hex (x)	Converts an integer to a hexadecimal string
Oct (x)	Converts an integer to an octal string
Bin (x)	Converts an integer to a binary string

#Python Object-oriented language#Everything in Python is Object#convert x to an integer#Define a stringMy_str ="1234"My_num=Int (MY_STR)Print(Type (my_num))Print(My_num)#convert x to a floating-point numberMY_STR1 ="3.14"My_f=float (MY_STR1)Print(Type (my_f))Print(My_f)#convert an object x to a stringnum = 123MY_STR2=str (num)Print(Type (MY_STR2))Print(MY_STR2)#Understand#used to calculate a "valid" Python expression in a string#and returns an objectMY_STR3 ="2323"ret=eval (MY_STR3)Print(Type (ret))Print(ret)#eval is often used in conjunction with inputresult = eval (input ("Please enter a number:"))Print(Type (result))Print(Result)

Python operators and common data type conversions