2 level dictionary

python

#1

We represent scores of batsmen across a sequence of matches in a two level dictionary as follows:

{'match1':{'player1':57, 'player2':38}, 'match2':{'player3':9, 'player1':42}, 'match3':{'player2':41, 'player4':63, 'player3':91}

Each match is identified by a string, as is each player. The scores are all integers. The names associated with the matches are not fixed (here they are 'match1','match2','match3'), nor are the names of the players. A player need not have a score recorded in all matches

Define a Python function "orangecap(d)" that reads a dictionary d of this form and identifies the player with the highest total score. Your function should return a pair (playername,topscore) where playername is a string, the name of the player with the highest score, and topscore is an integer, the total score of playername.


#2

@webace13055

data={'match1':{'player1':57, 'player2':38},
'match2':{'player3':9, 'player1':42},
'match3':{'player2':41, 'player4':63,'player3':91} }
print "====="
playerCollection=[]
playerTotals={}
for aMatch in data:
    for aPlayer in data[aMatch]:
        #print aPlayer,data[aMatch][aPlayer]
        if aPlayer in playerCollection:
            #aPlayer= aPlayer + data[aMatch][aPlayer]
            playerTotals[aPlayer] = playerTotals[aPlayer] + data[aMatch][aPlayer]
        else:
            playerCollection.append(aPlayer)
            playerTotals[aPlayer] = data[aMatch][aPlayer]
print playerCollection
print playerTotals
sortToMax = sorted(playerTotals.items(), key=lambda (k, (v2)): v2)
print sortToMax.pop()

#3

What are you asking for?


#4

Let us consider polynomials in a single variable x with integer coefficients:
for instance, 3x^4 - 17x^2 - 3x + 5. Each term of the polynomial can be
represented as a pair of integers (coefficient,exponent). The polynomial
itself is then a list of such pairs.

We have the following constraints to guarantee that each polynomial has a
unique representation:

-- Terms are sorted in descending order of exponent
-- No term has a zero cofficient
-- No two terms have the same exponent
-- Exponents are always nonnegative

For example, the polynomial introduced earlier is represented as

[(3,4),(-17,2),(-3,1),(5,0)]

The zero polynomial, 0, is represented as the empty list [], since it has
no terms with nonzero coefficients.

Write Python functions for the following operations:

addpoly(p1,p2)
multpoly(p1,p2)

that add and multiply two polynomials, respectively.

You may assume that the inputs to these functions follow the representation
given above. Correspondingly, the outputs from these functions should also
obey the same constraints.

Hint: You are not restricted to writing just the two functions asked for.
You can write auxiliary functions to "clean up" polynomials --- e.g.,
remove zero coefficient terms, combine like terms, sort by exponent etc.
Build a library of functions that can be combined to achieve the desired
format.

You may also want to convert the list representation to a dictionary
representation and manipulate the dictionary representation, and then
convert back.

Some examples:

addpoly([(4,3),(3,0)],[(-4,3),(2,1)])
[(2, 1),(3, 0)]

Explanation: (4x^3 + 3) + (-4x^3 + 2x) = 2x + 3


#5

Err...your not asking a question, are you?


#6

everytime i am getting this error------------------------: list indices
must be integers or slices, not tuple


#7

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.