Python supports a useful concept of default argument values
15 Oct, 2020
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:
The functions works like this:
Debug the given function print_from_stream using the default value of one of its arguments.
The function has the following signature:
This function should print the first 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 stream.
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 denoting the number of queries. Each of the following lines contains a stream_name followed by integer , and it corresponds to a single test for your function.
The output is produced by the provided and locked code template. For each of the queries (stream_name, n), if the stream_name is even then print_from_stream(n) is called. Otherwise, if the stream_name is odd, then print_from_stream(n, OddStream()) is called.
Sample Input 0
3odd 2even 3odd 5
Sample Output 0
There are queries in the sample.
In the first query, the function print_from_stream(2, OddStream()) is exectuted, which leads to printing values and 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 and in 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 and in separated lines as the first five non-negative odd numbers.