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This article mainly explains the "conversion of Python digital types", the content of the explanation is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "Python digital type conversion" bar!

The Python numeric data type is used to store values.

The data type is not allowed to be changed, which means that if you change the value of the numeric data type, the memory space will be reallocated.

The following example creates a digital object when a variable is assigned:

Var1 = 1

Var2 = 10

You can also use the de statement to delete some numeric object references.

The syntax of the del statement is:

Del var1 [, var2 [, var3 [...., varN]

You can delete single or multiple objects by using the de statement, for example:

Del var

Del var_a, var_b

Python supports four different numeric types:

Integer (Int)-often referred to as an integer or integer, is a positive or negative integer without a decimal point.

Long integer (long integers)-an infinitely large integer that ends with an uppercase or lowercase L.

Floating point type (floating point real values)-A floating point type consists of an integer part and a fractional part, and can also be represented by scientific counting (2.5e2 = 2.5x 102250)

Plural ((complex numbers))-the imaginary part of the plural ends with the letter J or j. Such as: 2cm 3i

Int

Long

Float

Complex

ten

51924361L

0.0

3.14j

one hundred

-0x19323L

15.20

45.j

-786

0122L

-21.9

9.322e-36j

080

0xDEFABCECBDAECBFBAEl

32.3+e18

.876j

-0490

535633629843L

-90.

-.65450J

-0x260

-052318172735L

-3.254e+89 trillion

3e+26J

0x69

-4721885298529L

70.2-E12

4.53e-7j

Long integers can also use lowercase "L", but it is recommended that you use uppercase "L" to avoid confusion with the number "1". Python uses "L" to display long integers.

Python also supports complex numbers, which are made up of real and imaginary parts, which can be represented by a + bj or complex (aforce b). Both the real part an and the imaginary part b of the complex number are floating point.

Python digital type conversion

Int (x [, base]) converts x to an integer

Long (x [, base]) converts x to a long integer

Float (x) converts x to a floating point number

Complex (real [, imag]) creates a plural

Str (x) converts object x to a string

Repr (x) converts object x to an expression string

Eval (str) is used to evaluate a valid Python expression in a string and returns an object

Tuple (s) converts sequence s into a tuple

List (s) converts sequence s into a list

Chr (x) converts an integer to a character

Unichr (x) converts an integer to a Unicode character

Ord (x) converts a character to its integer value

Hex (x) converts an integer to a hexadecimal string

Oct (x) converts an integer to an octal string

Python mathematical function

Function

Return value (description)

Abs (x)

Returns the absolute value of a number, such as abs (- 10) returns 10

Ceil (x)

Returns the upside integer of a number, such as math.ceil (4. 1) returns 5

Cmp (x, y)

If x

Y returns 1

Exp (x)

Returns the x power of e (ex), for example, math.exp (1) returns 2.718281828459045

Fabs (x)

Returns the absolute value of a number, such as math.fabs (- 10) returns 10.0

Floor (x)

Returns the rounded integer of a number, such as math.floor (4.9) returns 4

Log (x)

For example, math.log (math.e) returns 1.0 Magi math.log (100 Jing 10) returns 2.0

Log10 (x)

Returns the logarithm of x with a base of 10, such as math.log10 (100) returns 2.0

Max (x1, x2...)

Returns the maximum value of a given parameter, which can be a sequence.

Min (x1, x2...)

Returns the minimum value of a given parameter, which can be a sequence.

Modf (x)

Returns the integer part and the decimal part of x, the numerical symbols of both parts are the same as x, and the integer part is represented as a floating point.

Pow (x, y)

The value after the xroomy operation.

Round (x [, n])

Returns the rounded value of the floating point number x. If n is given, it represents the number of digits rounded to the decimal point.

Sqrt (x)

Returns the square root of the number x. The number can be negative and the return type is real. For example, math.sqrt (4) returns 2zero j.

Python random number function

Random numbers can be used in mathematics, games, security and other fields, and are often embedded in the algorithm to improve the efficiency of the algorithm and improve the security of the program.

Python contains the following common random number functions:

Function

Description

Choice (seq)

Pick an element randomly from the elements of the sequence, such as random.choice (range (10)), and randomly pick an integer from 0 to 9.

Randrange ([start,] stop [, step])

Gets a random number from a set that is incremented by the specified cardinality within the specified range, with a default cardinality of 1

Random ()

The next real number is randomly generated, which is in the range of [0mem1).

Seed ([x])

Change the seed seed of the random number generator. If you don't know how it works, you don't have to set seed,Python to help you choose seed.

Shuffle (lst)

Sort all the elements of the sequence randomly

Uniform (x, y)

The next real number is randomly generated, which is in the range of [xmemy].

Python trigonometric function

Python includes the following trigonometric functions:

Function

Description

Acos (x)

Returns the inverse cosine arc value of x.

Asin (x)

Returns the arcsine arc value of x.

Atan (x)

Returns the arc value of the arc of x.

Atan2 (y, x)

Returns the arc tangent of the given X and Y coordinate values.

Cos (x)

Returns the cosine of the radians of x.

Hypot (x, y)

Returns the Euclidean norm sqrt (x\ x + y\ y).

Sin (x)

The sine of the returned x radians.

Tan (x)

Returns the tangent of x radians.

Degrees (x)

Convert radians to angles, such as math.degrees (math.tan (1.0)), and return 30.0

Radians (x)

Convert angles to radians

Python mathematical constant

Constant

Description

Pi

Mathematical constant pi (pi, generally expressed as pi)

E

The mathematical constant e is a natural constant (natural constant).

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