"Python CookBook2" chapter I text-Test whether an object is a class string && string alignment

tests whether an object is a class string

Task

Sometimes it is necessary to test an object, especially if you are writing a function or method, you often need to test whether the passed argument is a string.

Solution Solutions

Use the built-in isinstance and basestring to quickly and easily query whether an object is a string or a Unicode object method, as follows:
Code:

def isastring (AAA):     return isinstance (aaa,basestring)

Operation Result:

>>> isastring ('aaa') True

string Alignment

Task

Implement string alignment: Left-justified, centered, right-aligned

Solution Solutions

This is the problem that the Ljust, Rjust, and center methods of the string object solve. Each method requires a parameter that indicates the width of the resulting string, and then returns a copy of the string with spaces added to the left, right, or both ends:

>>>Print "python". Ljust (15,"+") Python+++++++++>>>Print "python". Rjust (15,"+")+++++++++python>>>Print "python". Center (15,"+")+++++python++++