ValueError: cannot switch from manual field specification to automatic field numbering

Question

The class:

class Book(object):
    def __init__(self, title, author):
        self.title = title
        self.author = author

    def get_entry(self):
              


        

Answer 1

print ("{0:.1f} and the other no {0:.2f}".format(a,b)) 

python cannot do both manual and automatic precision handling (field numbering) in a single execution of code. You can either go for specifying the field numbering for each variable or let python do it automatically for all.