Python object type judgment and function overloading

The type function can be used to determine the object type. the sample code is as follows: 1. determine the object type.

You can use the type function to know the object type. the sample code is as follows:

x = 'Hello's = type(x)print sx = 'Hello's = type(x)print s

2. function overloading

When writing a function, you often encounter situations where you need to cope with different parameter types and different parameter quantities.

In C ++, multiple functions with different parameters of the same name are defined to be reloaded,

However, the overload in Python can be implemented using another method: parameter type judgment + default value

import os, sysdef tracelog(s='', n=40):    if isinstance(n, int):        print '-'*n    else:        print '-'*40    if isinstance(s, str):        print s    elif isinstance(s, list):        s1 = ''        for x in s:            s1 = s1 + ' ' + x        print s1   def main():    tracelog(n=50)    tracelog(sys.argv)    tracelog(n=20)

Main ()

import os, sys  def tracelog(s='', n=40):    if isinstance(n, int):        print '-'*n    else:        print '-'*40    if isinstance(s, str):        print s    elif isinstance(s, list):        s1 = ''        for x in s:            s1 = s1 + ' ' + x        print s1  def main():    tracelog(n=50)    tracelog(sys.argv)    tracelog(n=20)main()

The code above defines a function tracelog, which prints out the s parameter. The s parameter can be a string or a list, and the horizontal line of the specified length can be printed.

Among them, the isinstance function is used to determine whether the object is of a specific type. The second parameter is the object type, which can be queried through the type function.