Python supplemental python built-in function list

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The Python built-in (built-in) function is created as the Python interpreter runs. In Python programs, you can call these functions at any time, and you don't need to define them. The most common built-in functions are:

Print ("Hello world!")

In the Python tutorial, we have mentioned some of the following built-in functions:

Basic datatype type ()

Look back at Dir () help () Len ()

Dictionary Len ()

Input and output of text file open ()

Loop design Range () enumerate () Zip ()

Cyclic object iter ()

Function Object map () filter () reduce ()

The following are all the actual parameters, and you can try the effect directly on the command line.

Mathematical Operations

ABS ( -5) # take absolute value, i.e. 5

Round (2.6) # Rounded rounding, that is 3.0

Pow (2, 3) # equivalent to 2**3, if it is POW (2, 3, 5), equivalent to 2**3% 5

CMP (2.3, 3.2) # compares the size of a two number

Divmod (9,2) # Returns the division result and remainder

Max ([1,5,2,9]) # Ask for maximum value

MIN ([9,2,-4,2]) # to find the minimum value

SUM ([2,-1,9,12]) # sum

Type conversions

Int ("5") # is converted to an integral integer

Float (2) # Convert to floating-point float

Long ("Zero") # converts to a long integer long

STR (2.3) # Converts to string strings

Complex (3, 9) # returns complex number 3 + 9i

Ord ("a") # "a" character corresponding value

CHR # Number 65 corresponds to the character

UNICHR (+) # VALUE 65 for Unicode characters

BOOL (0) # converted to the corresponding true and False value, in Python, 0 is equivalent to False

In Python, the following objects are equivalent to false: [], (), {}, 0, None, 0.0, "

Bin (#) # Returns a String that represents the binary number of 56

Hex # Returns a String that represents the hexadecimal number of 56

Oct (dimension) # Returns a String that represents the octal number of 56

List (()) # Convert to Table list

Tuple ([2,3,4]) # Convert to Fixed value table tuple

Slice (5,2,-1) # Build Subscript Object Slice

Dict (a=1,b= "Hello", c=[1,2,3]) # Build Dictionary dictionary

Sequence Operations

All ([True, 1, "hello!"]) # If all elements are equal to true values

Any (["", 0, False, [], None]) # is there any one element equal to the true value

Sorted ([1,5,3]) # Returns the sequence of the positive sequence, i.e. [1,3,5]

Reversed ([1,5,3]) # Returns the sequence of the reverse order, i.e. [3,5,1]

class, object, property

# define Class Me (object):    def"hello!" "New hello!" me = Me ()     

Hasattr (Me, "test") # Check if the Me object has a test property

GetAttr (Me, "test") # Returns the Test property

SetAttr (Me, "test", New_test) # Set the test property to New_test

Delattr (Me, "test") # Delete Test Property

Isinstance (Me, Me) # Me object is the object generated by the Me class (a instance)

Issubclass (Me, object) # Me class is a subclass of the object class

compile, execute

Repr (Me) # Returns the string representation of an object

Compile ("Print (' Hello ')", ' test.py ', ' exec ') # Compile string becomes code object

Eval ("1 + 1") # interprets the string expression. The parameter can also be a code object returned by the compile ()

EXEC ("Print (' Hello ')") # interprets and executes the string, print (' Hello '). The parameter can also be a code object returned by the compile ()

other

Input ("Please input:") # Wait for input

Globals () # Returns the global namespace, such as global variable name, global function name

Locals () # Returns the local namespace

Python supplemental python built-in function list