Forum

We have a file with the statistics concerning a forum, where each line represents a user and contains the username (str), the number of posts in the forum, the number of read messages and the number of sent comments (three int), in this order and separated by a semicolon (';'). An example of this kind of file is file data_forum.txt with this content:

santpere;127;57;8
hackerx;32;2;0
rose;345;764;87
anneta;543;983;12
rllul;2;2;0
apolitic;322;345;32
nini;2372;7533;674
fonaments;372;1372;0

Save all functions into the file named forum.py.

1. Write the function no_opinion() that given the name of a file (str) with the format shown, returns a list with the usernames (str) of those users that have not made any comments. Examples:

   >>> lusers = ['santpere;127;57;8', 'hackerx;32;2;0', 'rose;345;764;87',
   ...   'anneta;543;983;12', 'rllul;2;2;0', 'apolitic;322;345;32', 
   ...   'nini;2372;7533;674', 'fonaments;372;1372;0']
   >>> with open('data_forum.txt', 'w') as f:
   ...    for e in lusers:
   ...        a = f.write (e+'\n')
   >>> no_opinion ('data_forum.txt')
   ['hackerx', 'rllul', 'fonaments']
   

   Note

   More tests are provided in file test-no_opinion.txt

2. There was a problem during the user registration process. Usernames must have at least 6 characters and we want to know if there are any errors. Write the function wrong_name() that given the name of a file like the previously shown (str), returns True if there is any username with less than 6 characters and False otherwise. Examples:

   >>> lusers = ['santpere;127;57;8', 'hackerx;32;2;0', 'rose;345;764;87',
   ...   'anneta;543;983;12', 'rllul;2;2;0', 'apolitic;322;345;32', 
   ...   'nini;2372;7533;674', 'fonaments;372;1372;0']
   >>> with open('data_forum.txt', 'w') as f:
   ...    for e in lusers:
   ...        a = f.write (e+'\n')
   >>> wrong_name ('data_forum.txt')
   True
   

   Note

   More tests are provided in file test-wrong_name.txt

3. Write the function entries() that given the name of a file as described above (str), the name of another file (str) and a number (int), creates this second file and writes in it those users who have made a number of entries to the forum greater than or equal to the given number. In the new created file there is a line for each user with the username and number of entries of that user separated by a space.

   With the data file data_forum.txt, shown at the beginning, and executing this statement:

   ...    for e in lusers:
   

   A new file with name visitors.txt will be created with this content:

   anneta 543
   nini 2372
   

   Note

   Tests for automatic debugging are provided in file test-entries.txt

Solution

A solution of these functions is provided in file forum.py