python programming learning progress seven

Today is learning python programming content on digital programming and the use of some of the related functions:

1, Number: scalar storage, random access, can not be changed (after the number change will generate a new object)

　　　　NOTE: immutable type of change is a pointer rather than the content itself

python support octal: 0 at the beginning

　　　Hex: beginning 0x

Double precision floating point type: may be represented by a direct scientific notation or decimal. Usually have a floating point value and a decimal point may be used optional suffix e n e between the index and the (+) or (-) indicates a negative exponent

2, plural:

　　The real part of the complex num.real #

　　num.imag # imaginary part of a complex number

　　num.conjugate () # Returns the complex conjugate of the complex

 

 

Mixed mode operator:

　　coerce (a, b) method:

　　　　　　　　　　If there is a plural number of operation, it will be transformed into another complex

　　　　　　　　　　If either operand is a long integer, the other will be converted to long integer

　　　　　　　　　　If there is a floating point operand, the other will be converted to floating point

　　Modulo operation:

　　　　　　　　　　Float modulo:

　　　　　　　　　　　　　　Suppliers for less accuracy is worth taking the difference between the product of the largest integer: x- (math.floor (x / y) * y)

　　Exponentiation: Left ** Right:

　　　　　　　　Symbols do not look left and right to see the sign:

>>>-3**2

-9

>>>(-3)**2

9

>>>4.0**-1.0

0.25

　　Bitwise Operators:

　　　　　　~ Num # unary, for every logical inverse of the :-( num + 1)

　　　　　　num1<<num2

　　　　　　num1>>num2

　　　　　　num1&num2

　　　　　　num1 ^ num2

　　　　　　num1 | num2

 

 

3, the function value of the plant:

　　bool (obj) # returns a Boolean value object

　　int (obj, base = 10) # Returns a string or numeric character represented by an object (base-band parameter is optional)

　　long()

　　float()

　　complex()

4, performance function:

　　coerce()

　　divmod(a,b)

　　　　　　　Integer: return (except the floor, take the remainder)

　　　　　　　Float: Returns (math.floor (num1 / num2), take the remainder)

　　　　　　　Complex: return (math.floor ((num1 / num2) .real), remainder)

5, taking the difference of entire functions:

　　int () # Direct truncated fractional part (return type)

　　floor () # give integer closest to but less than the original (return float)

　　round () # get the nearest integer number of original (return floating-point type)

6, numerical computation built-in functions:

　　abs (num) # returns the absolute value

　　coerce () # num1 and num2 convert to the same type

　　divmod ()

　　pow (num1.num2, mod = 1) # take if num1 num2 power provided mod parameter, the calculation result of the modulo operation performed mod

　　round()

The following are Examples:

 a. take. Determine whether the year is a leap year

#_auther_="stuwu79"
#date:2019/10/18
year = int(input("please input a year:"))
if (year % 4 == 0 and year % 100 != 0) or (year%4 == 0 and year%100 ==0):
    print("yes")
else:
    print("no")

b. the greatest common divisor and least common multiple

#_auther_="stuwu79"
#date:2019/10/18
a = int(input('please enter 1st num:'))
b = int(input('please enter 2nd num:'))
s = a * b
while a % b != 0:
    a, b = b, (a % b)
else:
    print(b, 'is the maximum common divisor')
    print(s // b, 'is the least common multiple')