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

with open('P0_files/texts.csv', 'r') as f:
    reader = csv.reader(f)
    texts = list(reader)

with open('P0_files/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
"""
fixed_lines = []
mobile_lines = []
telemark = []

for row in calls:
  if row[0].startswith('140'): 
    telemark.append(row[0])
  if row[1].startswith('140'):
    telemark.append(row[1])
  elif row[0].startswith("9") or row[0].startswith("8") or row[0].startswith("7"):
    mobile_lines.append(row[0])
  elif row[1].startswith("9") or row[1].startswith("8") or row[1].startswith("7"):
    mobile_lines.append(row[1])
  elif row[0].startswith("(0") :
    fixed_lines.append(row[0])
  elif row[1].startswith("(0") :
    fixed_lines.append(row[1])
print(set(mobile_lines))