Python Quick Tutorial (Supplement 03): List of Python built-in functions

Python built-in functions are created as the python interpreter runs. In a Python program, you can call these functions at any time without defining them. The most common built-in functions are:

PRint("Hello World!")

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

Basic data types type()

Look back at dir( ) help() len()

Dictionary len()

Text file input and output open()

Loop design range() enumerate() zip()

Loop object iter()

Function object map() filter() reduce()

The following parameters are all actual parameters. You can try the effect directly on the command line.

Mathematical operations

abs(-5)                                                                                                                                                                                      because , 3) ​​                  # is equivalent to 2**3, if is pow(2, 3, 5), which is equivalent to 2**3 % 5

cmp(2.3, 3.2)                                                                                                 max ([1,5,2,9])​​​​​​​​​​ Sum

type conversion

int(“5″)                                                                                                                                                                                    

long(“23″)                                                                         ​str(2.3)                                                                                                                                      # The numerical value corresponding to the “A” character

chr(65)                                                                                                                 The character corresponding to 65

unichr(65)                                                                                                                                                                                                        ​ 

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

Bin (56)# Return a string, indicating that 56 binary numbers

Hex (56)# Return a character back to a character String, representing the hexadecimal number of 56

oct(56)​​​​​​​​​

tuple( [2,3,4])   

slice(5,2,-1)                                                                                                                                                                             # Construct the subscript object slice

dict(a=1,b="hello", c=[1,2,3])                                                

all([True, 1, "hello!"]) # Whether all elements are equivalent to the True value

any(["", 0, False, [], None]) # Whether any element is equivalent Based on the True value

sorted([1,5,3])    The sequence of order, that is, [3,5,1]

class, object, attribute

Python

1

2

3

" ello!"

def new_test():

Print "New Hello!"

me = Me()

hasattr(me, "test") # Check whether the me object has the test attribute

getattr (me, "test")                                                                                                                                                                                                                                                                                                    ​         # Whether the me object is an object generated by the Me class (an instance)

issubclass(Me, object)​​​​​​​​​​​​​​​​ Express iCompile ("Print ('Hello')", 'Test.py', 'EXEC')# compile string becomes CODE objects

eval ("1 + 1 ″)# Explanation string expression. The parameter can also be the code object returned by compile()

exec(“print(‘Hello’)”)​​​​​​​ # Interpret and execute the string, print(‘Hello’). The parameter can also be the code object returned by compile()

Others

input("Please input:")​​​​​​​​

locals()