Finding the percentage in Python - Hacker Rank Solution
Problem
Tutorial :
A dictionary is a data type which stores values in pairs. For each element in
the dictionary, there is a unique key that points to a value. A dictionary is
mutable. It can be changed.
For example:
For example:
a_dict = {'one': 1} # Here 'one' is the key.
Note: The key of a dictionary is immutable. We cannot use a
list as a key because a list is mutable. But we can make a
tuple of list and use as key.
a_dict['two'] = 2 # Adds key 'two' which points to 2 print a_dict['one'] # prints 1 if 'three' in a_dict: # To check whether a certain string exist as a key in the dictionary print a_dict['three'] else: print "Three not there" # prints Three not there del a_dict['one'] # Deletes index 'one' and the value associated with it print a_dict # prints {'two': 2}
Note: A dictionary is unordered. So, only use the keys to
navigate through the dictionary.
You have a record of N students. Each record contains the student's name, and
their percent marks in Maths, Physics and Chemistry. The marks can be floating
values. The user enters some integer N followed by the names and marks for N
students. You are required to save the record in a dictionary data type. The
user then enters a student's name. Output the average percentage marks
obtained by that student, correct to two decimal places.
Input Format :
The first line contains the integer N, the number of students. The next N
lines contains the name and marks obtained by that student separated by a
space. The final line contains the name of a particular student previously
listed.
Constraints :
- 2 <= N <= 10
- 0 <= marks <= 100
Output Format :
Print one line: The average of the marks obtained by the particular student
correct to 2 decimal places.
Sample Input 0:
3 Krishna 67 68 69 Arjun 70 98 63 Malika 52 56 60 Malika
Sample Output 0:
56.00
Explanation 0:
Marks for Malika are {52,56,60} whose average is 52+56+60/3 = 56
Sample Input 1:
2 Harsh 25 26.5 28 Anurag 26 28 30 Harsh
Sample Output 1:
26.50
Solution :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # Finding the percentage in Python - Hacker Rank Solution if __name__ == '__main__': n = int(input()) student_marks = {} for _ in range(n): name, *line = input().split() scores = list(map(float, line)) student_marks[name] = scores query_name = input() # Finding the percentage in Python - Hacker Rank Solution START output = list(student_marks[query_name]) per = sum(output)/len(output); print("%.2f" % per); # Finding the percentage in Python - Hacker Rank Solution END |
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Hey, I am Parthe Omkar
print("{:.2f}".format(per))
f indicates float datatype and 2 means .2 decimal point
hey brother i also have a blog give me few suggestion please
what *line means in line 6