Python built-in function list

1. Mathematical operations
ABS (-5) # take absolute value, i.e. 5
Round (2.6) # rounded rounding, which 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) # Compare the size of two numbers
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

2. Type conversion
Int ("5") # is converted to an integral integer
Float (2) # Convert to floating-point float
Long ("23") # 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 (65) # Number 65 corresponds to the character
UNICHR (65) # VALUE 65 corresponds to the Unicode character

BOOL (0) # is converted to the corresponding true and False value, and in Python 0 is equivalent to false. In Python, the following objects are equivalent to false:** [], (), {}, 0, None, 0.0, "* *

Bin (56) # Returns a String representing a binary number of 56
Hex (56) # Returns a String that represents the hexadecimal number of 56
Oct (56) # 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

3. Sequence operation
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]

4. Classes, objects, attributes
# define Class
Class Me (object):
def test (self):
Print "Hello!"

Def new_test ():
Print "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

5. Compiling and executing
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 ()

6. 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

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