Python Basics-built-in functions (1)

Python provides a number of built-in functions.

First, the numerical processing correlation function:

1, take absolute value: ABS ()

def # Real signature Unknown    """  "" "    pass

ABS ()

2. Turn binary: Bin ()

def #  "" "        Return The binary representation of an integer.           >>> bin (2796202)       ' 0b1010101010101010101010 '    "" "

3, turn octal: Oct ()

def #  "" "        Return The octal representation of an integer.           >>> Oct (342391)       ' 0o1234567 '    "" "

4, ext. 16: Hex ()

def #  "" "        Return The hexadecimal representation of an integer.           >>> Hex (12648430)       ' 0xc0ffee '    "" "

5. Max value: Max ()

def # known special case of Max    """     Max (iterable, *[, Default=obj, Key=func]), value    max (arg1, arg2, *args, *[, Key=func]), value        With a single iterable argument, return to its biggest item. The    item that returns the maximum value using an iterative parameter is the    default keyword-only argument specifies an object to return if the    provided Iterable is empty.    With and or more arguments, return the largest argument.     """

6, take the minimum value: Min ()

def # known special case of Min    """     min (iterable, *[, Default=obj, Key=func]), value    min (arg1, arg2, *args, *[, Key=func]), value        With a single iterable argument, return to its smallest item. The    default keyword-only argument specifies an object to return if the    provided iterable is empty.    With and or more arguments, return the smallest argument.     """

Second, the return is a Boolean value of the function:

1. All elements are true, function returns true: All ()

def # Real signature Unknown    """     Return True if bool (x) is true to all values x in the iterable.        If the iterable is empty, return True.     """

2, one element is true, function returns true: any ()

def # Real signature Unknown    """     Return True if bool (x) is true to any x in the iterable.        If the iterable is empty, return False.     """

3. Whether the returned object can be called: callable ()

def # real signature unknown; restored from __doc__    """     Return Whether the object is callable (i.e., some kind of function).        Note that classes is callable, as is instances of classes with a    __call__ () method.     """

Iii. Compiling and executing code

1. Compile the string into Python code: compile ()

s="print (123)"R=compile (s,'<string>',  "exec")exec(R)

2. Execute code: EXEC () and eval ()

The difference: A, exec () can execute Python code, you can execute an expression, and eval () only executes an expression

b, EXEC () just executes, no return value, and eval () has a return value

s="print (123)"R=compile (s,'<string>',  "exec")exec(R)exec("print (' 10*10 ') "R=eval ("8*8")print (r)

　　

Python Basics-built-in functions (1)