Python arithmetic operators

Source: Internet
Author: User
Tags arithmetic operators bitwise bitwise operators

Python operators What is an operator?

This section mainly describes the Python operators. To give a simple example 4 +5 = 9 . In the example, 4 and 5 are called operands, and the "+" number is the operator.

The Python language supports the following types of operators:

    • Arithmetic operators
    • Compare (relational) operators
    • Assignment operators
    • logical operators
    • Bitwise operators
    • Member operators
    • Identity operator
    • Operator Precedence

Next, let's learn about Python's operators.

Python arithmetic operators

The following assumes that the variable A is 10 and the variable B is 20:

operator description instance
+ Plus-two object additions A + b outputs the result of a
- minus-get negative numbers or one number minus another a-B output result -10
* multiply by two numbers or return a string that is repeated several times A * b output result x
/ except-x divided by y b/a output 2
% modulo-Returns the remainder of division B% A output result 0
* * Power-Returns the Y power of x a**b output Results
// to divide-Returns the integer portion of a quotient 9//2 output result 4, 9.0//2.0 output 4.0
The following example demonstrates the operation of all Python arithmetic operators: #!/usr/bin/python a = 21b = 10c = 0 c = A + bprint "line 1-value of C is", c C = a-bprint "L Ine 2-value of C is ', c c = A * bprint "line 3-value of C are", c C = a/bprint "line 4-value of C is", c C = A% bprint "line 5-value of C are", c a = 2b = 3c = a**b print "line 6-value of C is", c a = 10b = 5c = a//b print "L Ine 7-value of C is ", C above instance output result: line 1-value of C is 31Line 2-value of C is 11Line 3-value of C is 210Line 4- Value of C is 2Line 5-value of C are 1Line 6-value of C is 8Line 7-value of C is 2 python comparison operator

The following assumes that the variable A is 10 and the variable B is 20:

operator description instance
= equals -The comparison object is equal to (a = = B) to return False.
! = Not equal-compare two objects are not equal (A! = B) returns true.
<> does not equal-compares two objects for equality (a <> B) returns True. This operator is similar to! =.
, greater than-return x is greater than Y (a > B) returns FALSE.
<</td> Less-Returns whether x is less than Y. All comparison operators return 1 for true, and return 0 for false. This distinction is equivalent to the special variable true and false. Note that these variable names are capitalized. (A < b) returns TRUE.
>= greater than or equal-returns whether X is greater than or equal to Y. (a >= B) returns FALSE.
<= is less than or equal-returns whether X is less than or equal to Y. (a <= B) returns True.
  The following example demonstrates the operation of all Python comparison operators:  #!/usr/bin/python a = 21b = 10c = 0 if (A = = B):    print "L Ine 1-a is equal-B "Else:   print" line 1-a was not equal to B " if (A! = b):    p Rint "line 2-a isn't equal to B" Else:   print "line 2-a are equal to B"  if (a <> b):    print "line 3-a isn't equal to B" Else:   print "line 3-a are equal to B"  if (A < b ):    print "line 4-a are less than B"  else:   print "line 4-a are not less than B" &n Bsp;if (A > B):    print "line 5-a was greater than B" Else:   print "line 5-a are not Greater than B " a = 5;b = 20;if (a <= B):    print" line 6-a was either less than or equal to &NB Sp;b "Else:   print" line 6-a was neither less than nor equal to  b " if (b >= a):  &nbsp ;  print "Line 7-b is either greater than  or equal to B "Else:   print" line 7-b is neither greater than  nor equ Al to B "above instance output:  line 1-a are not equal to bLine 2-a are not equal to bLine 3-a are not equal to BLine 4-a are n OT less than bLine 5-a are greater than bLine 6-a are either less than or equal to BLine 7-b are either greater than or Equal to B  python assignment operator

The following assumes that the variable A is 10 and the variable B is 20:

operator Description Example
= Simple assignment operator c = A + B assigns the result of the operation of A + B to c
+= 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
The following example shows the operation of all Python assignment operators: #!/usr/bin/python a = 21b = 10c = 0 c = A + bprint "line 1-value of C is", c c + = Aprint "line 2-value of C are ", C C *= aprint" line 3-value of C are ", C C/= a print" line 4-value of C is ", c C = 2c%= A Print "line 5-value of C are", C C **= aprint "line 6-value of C are", C C//= aprint "line 7-value of C is", C above instance Output: Line 1-value of C are 31Line 2-value of C is 52Line 3-value of C are 1092Line 4-value of C is 52Line 5-value of c is 2Line 6-value of C are 2097152Line 7-value of C is 99864 python bit operator

A bitwise operator computes a number as a binary. The bitwise algorithms in Python are as follows:

operator description instance
& bitwise-AND operator (A & B) Output result 12, binary interpretation: 0000 1100
| bitwise OR operator (A | b) output result 61, Binary interpretation: 0011 1101
^ bitwise XOR operator (a ^ b) output result 49, binary interpretation: 0011 0001
~ bitwise inverse operator (~a) output result-61, Binary interpretation: 1100 0011, in the complement form of a signed binary number.
<< left move operator a << 2 output result 240, binary interpretation: 1111 0000
>> Right Move operator a >> 2 output result 15, binary interpretation: 0000 1111
  The following example demonstrates the operation of all Python bitwise operators:  #!/usr/bin/python a =             # = 0011 1100 b =            # 13 = 0000 1101 c = 0 c = A & B;        # = 0000 1100print "line 1-value of C is", C c = a | b        # = 0011 1101 print "line 2-value of C is", c c = a ^ b;        # = 0011 0001print "line 3-value of C is", c c = ~a;           # -61 = 1100 0011print "line 4-value of C is", c c = a << 2;       # = 1111 0000print "line 5-value of C is", C c = a >> 2;       # = 0000 1111print "line 6-value of C is", output of C above example:  line 1-value of C i s 12Line 2-value of C is 61Line 3-value of C is 49Line 4-value of C is-61line 5-value of C are 240Line 6-value of C is 15 python logical operator

The Python language supports logical operators, with the following assumption that variable A is 10 and variable B is 20:

operator Description Example
and Boolean "and"-if x is False,x and Y returns false, otherwise it returns the computed value of Y. (A and B) returns True.
Or Boolean "or"-if x is true, it returns true, otherwise it returns the computed value of Y. (A or B) returns true.
Not Boolean "Non"-returns False if X is true. If x is False, it returns true. Not (A and B) returns false.
  The following example demonstrates the operation of all Python logical operators:  #!/usr/bin/python a = 10b = 20c = 0 if (A and B):    print " Line 1-a and B were true "Else:   print" line 1-either A was not true or B was not true " if (A or B) :    print "Line 2-either A was true or B is true or both be true" Else:   print "line 2-n Either A is true nor B was true "  a = 0if (A and B):    print" line 3-a and B are true "ELSE:&NB Sp;  print "line 3-either A was not true or B was not true"  if (A or B):    print "line 4- Either A is true or B is true or both be true "Else:   print" line 4-neither A was true nor B is true "&NB Sp;if not (A and B):    print ' line 5-a and B ' is true ' else:   print ' line 5-either A is Not true or B is not true "the above instance output results:  line 1-a and B are Trueline 2-either A is true or B is true or both is true Line 3-either a isn't True or B is not Trueline 4-either A was true or B is true or both be trueline 5-a and B are true python member operators

In addition to some of the above operators, Python also supports member operators, which contain a series of members, including strings, lists, or tuples.

operator Description Example
Inch Returns False if the value found in the specified sequence returns TRUE. x in the y sequence, if X returns true in the Y sequence.
Not in Returns True if no value is found in the specified sequence, otherwise false. X is not in the Y sequence if x does not return true in the Y sequence.
The following example demonstrates the operation of all Python member operators: #!/usr/bin/python a = 10b = 20list = [1, 2, 3, 4, 5]; if (A in list): print "line 1-a are available in the given list" Else:print "line 1-a are not available in the GIV En list ' if (b not in list): print ' line 2-b is not available in the given list ' else:print ' line 2-b ' is Availab Le in the given list ' A = 2if (A in list): ' print ' line 3-a are available in the given list ' Else:print ' line 3-a is not available in the given list "above instance output: Line 1-a are not available in the given Listline 2-b are not available in T He given Listline 3-a is available in the given list Python identity operator

The identity operator is used to compare the storage units of two objects

operator description instance
is are to determine if two identifiers are references From an object x is y if ID (x) equals ID (y),   is   returns result 1
is not is does not determine whether two identifiers are referenced from different objects x is not y if the ID (x) does not equal the ID (y).   is not   returns result 1
The following example shows the operation of all Python identity operators: #!/usr/bin/python a = 20b = if (A is B): print "line 1-a and B has same identity" else: Print "line 1-a and B don't have same identity" if (ID (a) = = ID (b)): print "line 2-a and B has same identity" E Lse:print "line 2-a and B don't have same identity" B = 30if (A was B): print "line 3-a and B has same identit Y "Else:print" line 3-a and B don't have the same identity "if (A is not B): print" line 4-a and B does not have same The identity "Else:print" line 4-a and B has same identity "above instance output: line 1-a and B has same identityline 2-a and b There are same identityline 3-a and b do not having same identityline 4-a and b do not have same identity Python operator precedence

The following table lists all the operators from highest to lowest priority:

operator description
* Index (highest priority)
~ +- bitwise rollover, unary plus and minus signs (the last two methods are named [email protected] and [email protected])
*/%// multiply, divide, modulo, and take divide
+- addition subtraction
>> << Right shift, left-shift operator
& bits ' and '
^ | Bitwise operators
<= < > >= comparison operators
<> = = = equals operator
=%=/=//=-= + = *= **= assignment operator
is a not identity operator
in Not in member operator
not OR and logical operators
The following example demonstrates the operation precedence of all Python operators: #!/usr/bin/python a = 20b = 10c = 15d = 5e = 0 E = (A + b) * C/D # (* +)/5print " Value of (A + B) * C/D is ", e-E = ((A + b) * c)/D # (+ *)/5print" Value of ((A + b) * C)/d is ", E =    (A + B) * (C/D);      # (15/5) print "Value of (A + B) * (C/D) is", e E = a + (b * c)/D; # + (150/5) print "Value of a + (b * c)/d is", E above instance output result: Value of (A + B) * C/D is 90Value of ((A + b) * c)/d is 90Value of (A + B) * (C/D) are 90Value of A + (b * c)/d is 50

Python arithmetic operators

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