The GetAttr () function in Python is detailed:

The GetAttr () function in Python is detailed:

GetAttr (object, name[, default]), value

Get A named attribute from an object; GetAttr (x, ' Y ') is equivalent to x.y.

When a default argument is given, it's returned when the attribute doesn ' t

Exist Without it, an exception was raised in the case.

The explanation is very abstract and tells me that this function acts as a

Object.name

GetAttr (Object,name)

In fact, why not object.name and sometimes must use GetAttr (Object,name), mainly because the name here is likely to be a variable, we do not know what this name is,

Can only be obtained by GetAttr (Object,name).

Instance:

def info (object,spacing=10,collapse=1):

"" "Print methods and Doc strings.

Takes module, class, List, dictionary, or string. "" "

Methodlist=[method for method in Dir (object) if callable (GetAttr (Object,method))]

Processfunc=collapse and (Lambda s: ". Join (S.split ()))" or (lambda s:s)

print "\ r \ n". Join (["%s%s"% (method.ljust (spacing), Processfunc (str (getattr (object,method). __doc__))) for method in MethodList])

If __name__== ' __main__ ':

Print info.__doc__

Print info ([])

Theoretically, getattr can be used for tuples, but since tuples have no methods, no matter what property name you specify, GetAttr throws an exception. GetAttr () can be used for

Built-in data types can also be used for modules.

GetAttr () Three parameters, the first is an object, the second is a method, and the third is an optional default return value. Returns the default if the property or method specified by the second parameter is not found

Value.

GetAttr () as a distributor:

Import Statsout

def output (data,format= ' text '):

Output_function=getattr (statsout, ' output_%s '%format,statsout.output_text)

return Output_function (data)

The GetAttr () function in Python is detailed: