Stas;Voron;0631234567
ivan;ivanov;0931234567   
vasya;vasya;0661234567 

import csv
a = int(input('Vvedite nomer '))
reader = csv.reader(open("data2.csv", "rb"), delimiter=';')
for row in reader:
    if a == row[2]:
        print row[0], row[1]
    else:
        print "Phone not found"

python bible3.py
Vvedite nomer 0931234567
Traceback (most recent call last):
  File "bible3.py", line 2, in <module>
    a = int(input('Vvedite nomer '))
  File "<string>", line 1
    0931234567
             ^
SyntaxError: invalid token

 python bible3.py
Vvedite nomer 931234567
Phone not found
Phone not found
Phone not found

python bible3.py
Vvedite nomer 0631234567
Stas Voron
Phone not found
Phone not found

found = False
 
for i in lst:
    if p(i):
       found = True
       print(i)
 
if not found:
    print('not found')

>>> a=08
  File "<stdin>", line 1
    a=08
       ^
SyntaxError: invalid token
>>> a=07

>>> print 010
8
>>> print 0x10
16
>>> print 0b10
2
>>> print 10
10

import csv
a = raw_input('Vvedite nomer ')
reader = csv.reader(open("data2.csv", "rb"), delimiter=';')
name = None
for row in reader:
    if a == row[2]:
        name = row[0], row[1]
if name:
    print name
else:
    print 'Phone not found'

 python bible3.py
Vvedite nomer 0631234567
('Stas', 'Voron')

Vvedite nomer 0931234567
Phone not found

>>> t = 'a', 'b'
>>> t
('a', 'b')
>>> print t
('a', 'b')
>>> print '{} {}'.format(*t)
a b
>>>

list(csv.reader(open("data2.csv", "rb"), delimiter=';'))

import csv
>>> list(csv.reader(open("data2.csv", "rb"), delimiter=';'))
[['Stas', 'Voron', '0631234567'], ['Ivan', 'Ivanov', '0931234567   '], ['Vasya', 'Vasya', '0661234567   ']]