Conversions between commonly used data types in Python __python

function	Description
int (x [, Base])	Convert x to an integer
Long (x [, Base])	Converts x to a long integer
Float (x)	Convert x to a floating-point number
Complex (real [, Imag])	Create a complex number
STR (x)	Convert object x to String
REPR (x)	Converts an object x to an expression string
eval (str)	Used to compute a valid Python expression in a string, and returns an object
Tuple (s)	Converts a sequence s to a tuple
List (s)	Converts the sequence s to a list
Set (s)	Convert to Variable set
Dict (d)	Create a dictionary. D must be a sequence (key,value) tuple.
Frozenset (s)	Convert to immutable set
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 a octal string

To view variable data types:

A=3

Import types

Type (a)

Int (a) #转换为整型

STR (a) #转换为字符串

python math function

function	return value (description)
ABS (x)	Returns the absolute value of a number, such as ABS (-10) Returning 10
Ceil (x)	Returns the upper integer of a number, such as Math.ceil (4.1) Returning 5
CMP (x, y)	If x < y returns-1, if x = = y returns 0, if x > y returns 1
EXP (x)	Returns the X power (ex) of E, as MATH.EXP (1) returns 2.718281828459045
Fabs (x)	Returns the absolute value of a number, such as Math.fabs (-10) Returning 10.0
Floor (x)	Returns the lower integer of a number, such as Math.floor (4.9) Returning 4
Log (x)	such as Math.log (MATH.E) return to 1.0,math.log (100,10) return 2.0
LOG10 (x)	Returns the logarithm of an X with a base of 10, such as MATH.LOG10 (100), returning 2.0
Max (x1, x2,...)	Returns the maximum value of the given parameter, which can be a sequence.
Min (x1, x2,...)	Returns the minimum value of the given parameter, which can be a sequence.
MODF (x)	Returns the integer and decimal parts of x, and the values of the two parts are the same as x, and the integral part is represented by a floating-point type.
Pow (x, y)	The value after the x**y operation.
Round (x [, N])	Returns the rounded value of a floating-point number x, such as an n value, that represents the digits rounded to the decimal point.
sqrt (x)	Returns the square root of a number x, the number can be negative, and the return type is real, as MATH.SQRT (4) returns 2+0J

python random number function

function	Description
Choice (seq)	Randomly select an element from the elements of a sequence, such as Random.choice (range (10)), and randomly select an integer from 0 to 9.
Randrange ([Start,] stop [, step])	Gets a random number from the specified range, in a collection that is incremented by the specified cardinality, with a cardinality default of 1
Random ()	Randomly generates the next real number, which is in the range of [0,1].
Seed ([x])	Change the seed of the random number generator. If you don't understand its rationale, you don't have to specifically set Seed,python to help you choose Seed.
Shuffle (LST)	To sort all the elements of a sequence randomly
Uniform (x, Y)	Randomly generates the next real number, which is within the [X,y] range.