Problem Name: Python -
In this HackerRank Functions in PYTHON problem solution,
In this challenge, the task is to debug the existing code to successfully execute all provided test files.
Python supports a useful concept of default argument values. For each keyword argument of a function, we can assign a default value which is going to be used as the value of said argument if the function is called without it. For example, consider the following increment function:
def increment_by(n, increment=1): return n + increment
The functions works like this:
>>> increment_by(5, 2) 7 >>> increment_by(4) 5 >>>
Debug the given function
print_from_stream using the default value of one of its arguments.
The function has the following signature:
def print_from_stream(n, stream)
This function should print the first n values returned by
get_next() method of
stream object provided as an argument. Each of these values should be printed in a separate line.
Whenever the function is called without the
stream argument, it should use an instance of
EvenStream class defined in the code stubs below as the value of
Your function will be tested on several cases by the locked template code.
The input is read by the provided locked code template. In the first line, there is a single integer q denoting the number of queries. Each of the following q lines contains a
stream_name followed by integer n and it corresponds to a single test for your function.
- 1 <= q <= 100
- 1 <= n <= 10
The output is produced by the provided and locked code template. For each of the queries
(stream_name, n), if the
print_from_stream(n) is called. Otherwise, if the
print_from_stream(n, OddStream()) is called.
Sample Input 0
3 odd 2 even 3 odd 5
Sample Output 0
1 3 0 2 4 1 3 5 7 9
print_from_stream(2, OddStream())is exectuted, which leads to printing values 1 and 3 in separated lines as the first two non-negative odd numbers. In the second query, the function
print_from_stream(3)is exectuted, which leads to printing values 2,4, and 6in separated lines as the first three non-negative even numbers. In the third query, the function
print_from_stream(5, OddStream())is exectuted, which leads to printing values 1,3,5,7 and 9 n separated lines as the first five non-negative odd numbers.
#1 Code Example with Python Programming
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def print_from_stream(n, stream=None): if not stream: stream=EvenStream() for _ in range(n): print(stream.get_next())