[C014] Python data type-numerical type

Python supports built-in data types, including numbers, strings, lists, dictionaris, and tuples.

Generally, data types are combined with operators. The size and accuracy of a data type, the declaration and initialization of variables, and priority and combination, type conversion, and precision loss must be considered for operators. The variable name is a combination of letters, numbers, and underscores. All functions and external variables are defined in the _ main _ () function.

Description of data types: variables do not need to be declared in python. You only need to assign values when using them (based on the dynamic type model during python runtime ), check whether the variables and values and objects are referenced.

 

1. numbers

Numbers mainly includes Integer, float, octal hexadecimal, and complex numbers ).

>>> Type (3.0)

<Type 'float'>

>>> Type (3)

<Type 'int'>

>>> Type (111111111111111111111111111)

<Type 'long'>

>>> Type (True)

<Type 'bool '>

>>> Type (1 + 2j)

<Type 'compute'>

Python

Python does not limit the size of real numbers, as long as you have enough memory. Multiple operation operations and built-in methods are supported, including arithmetic operations (+-*/**), logical operations (and, or, not), and relational operations (>=<>! ====...), Bitwise (| ^ & >>< ).

 

Five Python built-in functions for Numerical Calculation

1 abs () returns the absolute value of a given Parameter

2 coerce () data type conversion function returns a tuple containing two numeric elements after type conversion.

 

>>> Coerce (1, 2)

(1, 2)

>>> Coerce (1.3, 3)

(1.3, 3.0)

>>> Coerce (1j, 12)

(1j, (12 + 0j ))

 

3 divmod () combines division and remainder operation to return a tuple containing the quotient and remainder.

 

>>> Divmod (10, 3)

(3, 1)

>>> Divmod (3, 10)

(0, 3)

>>> Divmod (10, 2.5)

(4.0, 0.0)

>>> Divmod (2.5, 10)

(0.0, 2.5)

 

4 pow () and ** are the same as exponential operations.

 

>>> Pow (2, 5)

32

>>> Pow (3.141592, 2)

9.8696002944640018

>>> Pow (1 + 1j, 3)

(-2 + 2j)

>>>

 

5 round () is used to round a floating point number.

 

>>> Round (3)

3.0

>>> Round (3.45)

3.0

>>> Round (3.5)

4.0

>>> Round (3.4566656, 1)

3.5

>>> Round (3.4566656, 2)

3.46

>>> Import math

>>> For eachNum inrange (10 ):

Print round (math. pi, eachNum)

 

 

3.0

3.1

3.14

3.142

3.1416

3.14159

3.141593

3.1415927

3.14159265

3.141592654

>>>

 

Built-in functions for Integers only:

Hexadecimal conversion functions:

 

1. hex (num) accepts an integer and returns the corresponding hexadecimal format.

>>> Hex (1, 255)

'0xff'

 

2. oct (num)

>>> Oct (255)

'123'

 

ASCII conversion functions

 

1ord (): enter a character and the output is its corresponding ASCII code.

 

>>> Ord ('A ')

97

>>> Ord ('')

32

>>> Ord ('A ')

65

>>> Ord ('0 ')

48

 

2. Enter an ASCII number in chr () and the output is a corresponding character.

 

>>> Chr (97)

'A'

>>> Chr (32)

''

>>> Chr (65)

'A'

>>> Chr (48)

'0'

>>>

Type conversion, like c, is generally oriented to high precision (as long as a + bj is involved, it should also be included ). The print statement automatically saves extra precision.

>>> A = 1

>>> B = 2

>>> A/B

0

>>> A = 1.0

>>> A/B

0.5

>>> A = 1 + 2j

>>> A + B

(3 + 2j)

>>>

Of course, you can also perform forced type conversion.

>>> A = 5

>>> Long ()

5L

>>> Int ()

5

>>> Float ()

5.0

>>> Complex ()

(5 + 0j)

>>>

Source:

Python supports built-in data types, including numbers, strings, lists, dictionaris, and tuples.

Generally, data types are combined with operators. The size and accuracy of a data type, the declaration and initialization of variables, and priority and combination, type conversion, and precision loss must be considered for operators. The variable name is a combination of letters, numbers, and underscores. All functions and external variables are defined in the _ main _ () function.

Description of data types: variables do not need to be declared in python. You only need to assign values when using them (based on the dynamic type model during python runtime ), check whether the variables and values and objects are referenced.

 

1. numbers

Numbers mainly includes Integer, float, octal hexadecimal, and complex numbers ).

>>> Type (3.0)

<Type 'float'>

>>> Type (3)

<Type 'int'>

>>> Type (111111111111111111111111111)

<Type 'long'>

>>> Type (True)

<Type 'bool '>

>>> Type (1 + 2j)

<Type 'compute'>

Python

Python does not limit the size of real numbers, as long as you have enough memory. Multiple operation operations and built-in methods are supported, including arithmetic operations (+-*/**), logical operations (and, or, not), and relational operations (>=<>! ====...), Bitwise (| ^ & >>< ).

 

Five Python built-in functions for Numerical Calculation

1 abs () returns the absolute value of a given Parameter

2 coerce () data type conversion function returns a tuple containing two numeric elements after type conversion.

 

>>> Coerce (1, 2)

(1, 2)

>>> Coerce (1.3, 3)

(1.3, 3.0)

>>> Coerce (1j, 12)

(1j, (12 + 0j ))

 

3 divmod () combines division and remainder operation to return a tuple containing the quotient and remainder.

 

>>> Divmod (10, 3)

(3, 1)

>>> Divmod (3, 10)

(0, 3)

>>> Divmod (10, 2.5)

(4.0, 0.0)

>>> Divmod (2.5, 10)

(0.0, 2.5)

 

4 pow () and ** are the same as exponential operations.

 

>>> Pow (2, 5)

32

>>> Pow (3.141592, 2)

9.8696002944640018

>>> Pow (1 + 1j, 3)

(-2 + 2j)

>>>

 

5 round () is used to round a floating point number.

 

>>> Round (3)

3.0

>>> Round (3.45)

3.0

>>> Round (3.5)

4.0

>>> Round (3.4566656, 1)

3.5

>>> Round (3.4566656, 2)

3.46

>>> Import math

>>> For eachNum inrange (10 ):

Print round (math. pi, eachNum)

 

 

3.0

3.1

3.14

3.142

3.1416

3.14159

3.141593

3.1415927

3.14159265

3.141592654

>>>

 

Built-in functions for Integers only:

Hexadecimal conversion functions:

 

1. hex (num) accepts an integer and returns the corresponding hexadecimal format.

>>> Hex (1, 255)

'0xff'

 

2. oct (num)

>>> Oct (255)

'123'

 

ASCII conversion functions

 

1ord (): enter a character and the output is its corresponding ASCII code.

 

>>> Ord ('A ')

97

>>> Ord ('')

32

>>> Ord ('A ')

65

>>> Ord ('0 ')

48

 

2. Enter an ASCII number in chr () and the output is a corresponding character.

 

>>> Chr (97)

'A'

>>> Chr (32)

''

>>> Chr (65)

'A'

>>> Chr (48)

'0'

>>>

Type conversion, like c, is generally oriented to high precision (as long as a + bj is involved, it should also be included ). The print statement automatically saves extra precision.

>>> A = 1

>>> B = 2

>>> A/B

0

>>> A = 1.0

>>> A/B

0.5

>>> A = 1 + 2j

>>> A + B

(3 + 2j)

>>>

Of course, you can also perform forced type conversion.

>>> A = 5

>>> Long ()

5L

>>> Int ()

5

>>> Float ()

5.0

>>> Complex ()

(5 + 0j)

>>>

Source: http://blog.sina.com.cn/s/blog_4b5039210100e9ya.html