Python - function call

When calling a function, if the number of parameters of the function is incorrect, a TypeError will be reported, such as

TypeError: abs() takes exactly one argument (2 given)

The abs function has only one parameter, but two were given

 

If the parameter type cannot be accepted by the function, an error will also be reported, such as

TypeError: bad operand type for abs(): 'str'

str is the wrong parameter type

 

data type conversion

Commonly used functions in Python also include data type conversion

>>> int('123')
123
>>> float(123)
123.0
>>> str(321)
'321'
>>> bool(1)
True

 

 

A function name is actually a reference to a function object. You can assign the function name to a variable, which is equivalent to giving the function an alias.

 

>>> a = print
>>> a('boom')
boom