Task3.py

"""
Read file into texts and calls.
It's ok if you don't understand how to read files.
"""
import csv

with open('texts.csv', 'r') as f:
    reader = csv.reader(f)
    texts = list(reader)

with open('calls.csv', 'r') as f:
    reader = csv.reader(f)
    calls = list(reader)

"""
TASK 3:
(080) is the area code for fixed line telephones in Bangalore.
Fixed line numbers include parentheses, so Bangalore numbers
have the form (080)xxxxxxx.)

Part A: Find all of the area codes and mobile prefixes called by people
in Bangalore.
 - Fixed lines start with an area code enclosed in brackets. The area
   codes vary in length but always begin with 0.
 - Mobile numbers have no parentheses, but have a space in the middle
   of the number to help readability. The prefix of a mobile number
   is its first four digits, and they always start with 7, 8 or 9.
 - Telemarketers' numbers have no parentheses or space, but they start
   with the area code 140.

Print the answer as part of a message:
"The numbers called by people in Bangalore have codes:"
 <list of codes>
The list of codes should be print out one per line in lexicographic order with no duplicates.

Part B: What percentage of calls from fixed lines in Bangalore are made
to fixed lines also in Bangalore? In other words, of all the calls made
from a number starting with "(080)", what percentage of these calls
were made to a number also starting with "(080)"?

Print the answer as a part of a message::
"<percentage> percent of calls from fixed lines in Bangalore are calls
to other fixed lines in Bangalore."
The percentage should have 2 decimal digits
"""

# PART A
area_codes = set()
for call in calls:
    if call[0][:5] == '(080)':
        if call[1][0] == '(':
            code = call[1].split(')')
            area_codes.add(code[0][1:])
    elif call[1][0] in ('7', '8', '9'):
        code = call[1].split()
        area_codes.add(code[1])

sorted_codes = sorted(list(area_codes))

print("The numbers called by people in Bangalore have codes:")
for code in sorted_codes:
    print(code)

# PART B
count_calls_to_bang = 0
count_calls_from_bang = 0
for call in calls:
    if call[0][:5] == '(080)':
        count_calls_from_bang += 1
        if call[1][:5] == '(080)':
            count_calls_to_bang += 1

if count_calls_to_bang == 0:
    percentage = 0
else:
    percentage = (float(count_calls_to_bang) /
                float(count_calls_from_bang)) * 100
print(str(round(percentage, 2)) +
      " percent of calls from fixed lines in Bangalore are calls to other fixed lines in Bangalore.")