Task (Python)
A lot of police investigations start off by examining where the potential suspects
was at the time of the crime. This is often done by asking phone companies to
provide lists of all mobile phones that was in the area where the crime was
committed around the time when it was committed. If there is only one crime scene
this is not a big problem but if there are several crime scenes then the task of cross
referencing the lists gets quite tedious. To combat this the local police department
has decided to automate the process by creating a script that automatically does
most of the work for them.
The script shall work as follows:
1- Start the script
2- Provide one or more paths to files with phone numbers
3- The script finds out what phone numbers occur in all files
4- The script looks up who owns the phone numbers found
5- The script displays the found names
To break it all down a little bit further this is what should happen during each step.
1. When starting the script, a path to a file that contains the
mapping between name and number shall be given as a
command line argument. This file shall contain a pickled
dictionary on the following format {‘0709-12345’: ‘Anna’}.
2. To be able to provide an arbitrary number of files a menu is
needed. The menu shall have the following options: 1. Add
file and 2. Calculate. All file paths added shall be saved in a list
for later use.
3. This step is part of the menu option 2. Calculate. The script
shall cross reference the numbers in all the files provided and
create a Set with the ones that occur in all files. The files with
the phone numbers store one phone number per line and is
saved as a regular text file.
4. This step is part of the menu option 2. Calculate. Using the Set
of found numbers the script looks up the owner’s names using
the file sent as a command line argument. The names shall be
saved in a list.
5. All the found names located in the set from Step 4 is displayed
on the screen.
To solve task the student must make use of a main function and also implement the
following functions:
display_menu ()
This function shall display the following menu on screen:
1. Add file
2. Calculate
cross_reference (files)
The parameter files shall be a list of filenames (full path). The files shall be files
containing one phone number per line. The function shall create, and return,
a Set containing all the phone numbers that occurs in all files.
map_numbers_to_names (numbers, filename)
This function shall match each number from the Set numbers to a name and store
the names in a list. To accomplish this, the function shall use a dictionary that is
loaded (using pickle) from the file filename. The dictionary shall use the format
{‘0709-12345’: ‘Anna Karlsson’}. If a number can not be found in the dictionary it
shall be listed as Unknown with the phone number attached, like can be seen in this
example: Unknown (0709-11111). The function shall return the list with the names
and/or unknown tags.
display_suspects (names)
As the name of the function suggests this function shall display the names of all
suspects sent to the function as a list of strings. The format shall be as shown here:
------------------------------------------------------
The following persons was present on all crime scenes:
------------------------------------------------------
Max Olsson
Zara Walthersson
Unknown (0703-23464)
------------------------------------------------------
If the list sent as a parameter is empty the following message shall be shown:
------------------------------------------------------
The following persons was present on all crime scenes:
------------------------------------------------------
No matches
------------------------------------------------------
Make sure to include error handling that displays the following message to the user
if the file given as command line arguments or the files specified while running the
script is not valid:
------------------------------------------------------
Error: There was a problem with at least one of the files.
------------------------------------------------------
Hint: These files (owners, crime scene 1 , crime scene 2 and crime scene 3) and can be used as an example of how the files with owner mapped to phone
numbers and the lists from the crime scenes might look like.
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Task (Python) A lot of police investigations start off by examining where the potential suspects was...
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