function Call of Python function

Python has built in a lot of useful functions that we can call directly.

To invoke a function, you need to know the name and parameters of the function, such as a function that asks for an absolute value abs , and only one argument. Documents can be viewed directly from the official Python website:

Http://docs.python.org/3/library/functions.html#abs

You can also help(abs) view the abs function's help information on the interactive command line.

1. Call abs function:

>>> ABS (100>>>) abs ( -20)20>>> abs (12.34)12.34

2. Data type conversion

Python's built-in common functions also include data type conversion functions, such as int() functions that convert other data types to integers:

>>> int ('123')123>>> int (12.34)12>>> Float ('12.34')12.34>>> str (1.23)'1.23  '>>> str ' [+]>>> bool (1  ) True>>> bool (") False

3, function name is actually a reference to a function object, it is possible to assign a function name to a variable, which is equivalent to the function of an "alias"

# variable a points to the ABS function # so you can also call the ABS function by a 1

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function Call of Python function