Python programming-oriented interview questions - from Multiple Companies
=======================================================================
Ans: (1, 2, 3) tuple of values
=========================================================================
Python Interview Questions on Loops
Given input: "Narendra Boyina"
Required output:
arendra Boyina
Nrendra Boyina
Naendra Boyina
Narndra Boyina
Naredra Boyina
Narenra Boyina
Naendra Boyina
Nrendra Boyina
x = "Narendra Boyina"
y = x.split() # ["Narendra", "Boyina"]
for i in range(len(y[0])):
y = x.replace(x[i],"",1)
print(y)
==============================================================
"""Find the sum of the series 2 +22 + 222 + 2222 + .. n terms"""
num = int(input("Enter integer value, where you want to stop series : "))
start = 2
sum = 0
for i in range(1, num+1):
print(start, end=" ")
sum += start
start = (start * 10) + 2
print("\nSum of above series is:", sum)
console output:
Enter integer value, where you want to stop series : 4
2 22 222 2222
Sum of above series is: 2468==============================================================
"""W.A.P to reverse an integer"""
num = int(input("enter number"))
while num > 0:
digit = num % 10
num = num // 10
print(digit, end="")
# OR
num = int(input("enter number"))
rev = 0
while num > 0:
rev = (rev * 10) + num % 10
num //= 10print(rev)
==============================================================
""" Python | Permutation of a given string using the inbuilt function"""
from itertools import permutations
s = "Narendra" # check with s="abc" you will get 6 permutations
ps = permutations(s)
count = 0
for i in ps:
print("".join(i))
count += 1
print(count) # 40320 permutations will get for Narendra==============================================================
""" W.A.P to find the sum of elements in the list"""list1 = [11, 5, 17, 18, 23]
print(sum(list1))# --->or<---
list_1 = [11, 5, 17, 18, 23]
total = 0
for element in list_1:
total += element # total = total+i
print(total)
# --->or<---
req = 0
for i in range(0, len(list1)):
req =req + list1[i]
print(req)==============================================================
"""W.A.P to take a list of elements from the user/console """
"""Note: While giving i/p values via console give with spaces between each value"""input_string = input("enter list values: ") # by default, it will consider as string
input_list = input_string.split() # it will give list of strings
print(input_list)
# input via console: enter list values: narendra 55 6.7 mahalakshmi
# output: ['narendra', '55', '6.7', 'mahalakshmi']
"""W.A.P to take a list of numbers from the user/console """input_string = input("Enter values by providing space b/w each value: ")
input_list = input_string.split() # it w strings
# below code is for converting each string into integer available in the list
for i in range(len(input_list)):
input_list[i] = int(input_list[i]) # convert each element to integer type and place in same index
print(input_list)
# input via console: Enter values by providing space b/w each value: 44 65 23 44
# Output : [44, 65, 23, 44]=========================================================================
""" W.A.P. to check Armstrong number or not"""
num = int(input("enter a number:"))
sum = 0
temp = num
while temp > 0:
digit = temp % 10
sum = sum + digit**3
temp = temp//10
if num == sum:
print("given num is Armstrong
number")
else:
print("given number is not
Armstrong")
#==================================================================
"" W.A.P to get prime numbers between interval"""
start = int(input("enter"))
end = int(input("enter"))
for i
in range(start,
end+1):
for
j in
range(2, i):
if i % j == 0:
break
else:
print(i, end=" ")
""" W.A.P to get prime number till given number"""
def prime(num):
for
i in
range(2, num + 1):
for j in range(2, i):
if i % j == 0:
break
else:
print(i, end=" ")
num = int(input("enter number:"))
prime(num)
===============================================================
""" W.A.P to reverse words in a given string in Python"""
def reverse_string():
"""This
function gives reverse of a given string"""
req_string =
string.split() # converted string to list
req_string.reverse()
result = "
".join(req_string) # joined with none string
return result
string = input("enter
string:")
print(reverse_string())
===============================================================
""" W.A.P to print fibonacci series """
def
fibonacci(n):
n1 = 0
n2 = 1
temp = 0
while temp < n:
print(temp, end=" ")
n1 = n2
n2 = temp
temp = n1 + n2
n = int(input(" enter
number:"))
fibonacci(n)
===============================================================
""" W.A.P to find whether a no is the power of two"""
def powerof_2(n):
if
n == 1:
return True
elif n % 2 != 0 or n == 0:
return
False
return powerof_2(n / 2)
n = int(input("enter number"))
print(powerof_2(n))
===============================================================
"""W.A.P to display the only
duplicates"""
from collections import Counter
list = [1,2,3,2,3,4,5,6,7,7]
var = Counter(list)
print(var) #
Counter({2: 2, 3: 2, 7: 2, 1: 1, 4: 1, 5: 1, 6: 1})
for char,times
in var.items():
if
times>1:
print(char,end=" ")
===============================================================
"""W.A.P to print duplicates from a list of
integers"""
def duplicate_element():
"""This function gives duplicate elements from given
list"""
repeated = []
for
i in
range(len(list)):
for j in range(i+1, len(list)):
if list[i] == list[j] and list[i] not in repeated:
repeated.append(list[i])
return
repeated
list = [1, 3, 3, 2, 4, 4, 5, 6, 6, 8, 7]
print(duplicate_element())
===============================================================
# W.A.P for printing range of float values (Zebra company asked me in 2021)
def test_range(start_val, end_val, step):
total = start_val
result =[]
while
total<end_val:
total = total+step
result.append("{:.2f}".format(total))
return
result
result = test_range(0.0, 5.0, 0.2)
print(result)
=============================================================
A = input (“Enter any number: \t”) Ex: 7
B = input (“Enter any number:
\t”) Ex: 8
print(A*B)
Answer: Error
Reason: input function by default taken as strings
TypeError: can't
multiply sequence by non-int of type 'str'
==============================================================
How do you replace a particular value/ string in a list, in multiple places
simultaneously?
a= ["Hi",444, "hello",472, "good morning",732, "hello",74.5, "hello", 34]
for i in a:
if i == "hello":
a[a.index(i)] =
"Narendra"
print(a)
==============================================================
""" W.A.P to replace vowels in a string with a successive alphabet of a vowel
Note: 1 ord() is a Built-in Method that Returns an integer of the Unicode character
Note: 2 chr() is a Built-in Method that Returns a Character (string) from an Integer
vowels_list = ["a", "e", "i", "o", "u"]
"""
data = input("Enter any string")
temp = []
for element in data:
if element in vowels_list : # identifying vowels
# converting vowel to ASCII add 1 then converting to string & appending into list
temp.append(chr(ord(element) + 1))
else:
temp.append(element) # placing consonants in a list
required_output = "".join(temp)
print(required_output)or
x = input("Enter any string")
print("".join([(chr(ord(elem)+ 1)) if elem in ["a", "e", "i", "o", "u"] else elem for elem in x]))
==============================================================
W.A.P. for converting paragraphs to lines using Python.
a =
"LOCATE REPO_ENABLE, REPO_DISABLE, PERIODIC, POWER_UP, BATT_WARN,
DISCONNECT,
SHUTDOWN, IGNITION_OFF, IGNITION_ON, GEOFENCE_ENTRY,
GEOFENCE_EXIT, PARKING,
IDLING, IDLING_END, SPEEDING_END, SPEEDING,
GIMPACT_DETECTED" #paragraph
b=a.split(", ") # converted into List
for i in b:
print(i)
# lines will be printed.
=============================================================
Write a code to sort a
numerical list in Python
list = ["2", "7", "4", "3"]
list = [int(i) for i in list] # used list comprehension
list.sort()
print(list)W. A.P to insert a character at Nth positiondef insert_char(user_string, pos, char):
temp = []
for i in user_string:
temp.append(i)
temp.insert(pos, char)
return "".join(temp)
user_string = input("Enter string: ")
pos = int(input("Enter position: "))
char = input("Enter character: ")
print(insert_char(user_string, pos, char))
=========================================================================
""" W.A.P. to Find the missing numbers in the given list. Example: input_lst [1, 3, 5, 7] required output : [2, 4, 6, 8]"""def validate_missing_num(lst):
flag = 0
missed_numbers = []
for n in range(1,11):
if n not in lst:
print(n," is missing")
flag += 1 # flag to count no of missing numbers
missed_numbers.append(n)
else:
continue
if flag == 0: # when flag is 0 print "no missing numbers"
print("Nothing is missing")
else:
print("missed numbers are :{}".format(missed_numbers))
input_lst = [1, 2, 4, 5, 8, 10]
validate_missing_num(input_lst)
=========================================================================
""" W.A.P to validate whether the given string is in the correct consecutive alphabet order or not?"""
def consecutive_str_validate(input_string):
l = len(input_string)
s = ''.join(sorted(input_string))
for i in range(1, l):
if ord(s[i]) - ord(s[i - 1]) != 1:
return False
return True
if _name_ == "_main_":
input_string = "bcd"
if consecutive_str_validate(input_string):
print("true")
else:
print("false")
input_string = "ghj"
if consecutive_str_validate(input_string):
print("true")
else:
print("false")
======================================================================
""" Write a Python function that accepts a string and
calculate the number of upper case letters and lower case letters."""
def test_str(str):
d = {'uppercase': 0, 'lowercase': 0}
for i in str:
if i.isupper():
d['uppercase'] += 1
elif i.islower():
d['lowercase'] += 1
else:
pass
print("upper case count {0}\nlower count {1}".format(d['uppercase'], d['lowercase']))
str = input("enter a string: ")
test_str(str)
===================================================================
""" Write a Python function that takes a list and returns a new list with unique elements of the first list."""
def unique_list(data):
req = []
for element in data:
if element not in req:
req.append(element)
print(req)
data = [5, 3, 1,3, 4, 5, 6, 6, 68, 8, 8, 8, 68]
unique_list(data)
==================================================================
Python Interview Questions on Recursive Functions
W.A.P. to calculate the sum of a list of numbers or Recursive function example.
def sum(num):
if len(num) == 1:
# if only one element in the list, sum result will be equal to the element
return num[0]
else:
return num[0] + sum(num[1:])
print(sum([2, 5, 3, 6, 4])) ==========================================================
Python Interview Questions on Functions
""" Write a Python function to sum all the numbers in a list"""
def addition(numbers):
total = 0
for i in numbers:
total +=i
return total
numbers = [3,5,2,7,5,8,8]
total = addition(numbers)
print(total)
=====================================================
""" Write a Python function to multiply all the numbers in a list"""
def multiply(numbers):
mul = 1
for num in numbers:
mul *= num # mul = mul*
print(mul)
multiply([4, 3, 5, -2]) # calling function
#==============================================================
""" Write a Python function to calculate the factorial of a number"""
def factorial(n):
if n == 0:
print("1")
else:
fac = 1
for i in range(1, n+1):
fac *= i # fac = fac*i
print("factorial of", n, "is", fac)
n = int(input("enter a number :"))
factorial(n)
# --->or<---
import math
print(math.factorial(5))
# =====================================================
What is An anagram? Explain with an example
An anagram is the result of rearranging the letters of a word
or phrase to produce a new word or phrase,
using all the original letters exactly once;
for example, the word cautioned can be rearranged into education.
list_str1 = list(str1)
list_str1.sort()
list_str2 = list(str2)
list_str2.sort()
return (list_str1 == list_str2)
print(is_anagram("cautioned", "education"))
print(is_anagram("cat", "rat"))Or
def anagram(str1, str2):
if sorted(str1) == sorted(str2):
print("given strings are anagram")
else:
print("given strings are not anagram")
anagram("cautioned", "education") # given strings are anagram
anagram("anagram", "annagaram") # given strings are not anagram================================================================
""" insert a character at nth
position"""
def ins_char():
user_string = input("enter string")
pos = int(input("enter position"))
char = input("enter character")
l = []
for
i in
user_string:
l.append(i)
l.insert(pos, char)
print("".join(l))
ins_char()
================================================================
""" Sorting dictionaries based on
value"""
a = {1:23,2:1,3:11}
print(sorted(a.items(), key = lambda x:x[1])) # [(2, 1), (3, 11), (1, 23)] list of tuples
print(dict(sorted(a.items(), key = lambda x:x[1]))) # converted into dictionary {2: 1, 3: 11, 1: 23}
==============================================================
""" Sorting list of lists based on the second element in
each list"""
# Given input è [[1,3,5], [3,4,6], [1,2,3]]
# Required output è [[1, 2, 3], [1, 3, 5], [3, 4, 6]]
list_a=[[1,3,5], [3,4,6], [1,2,3]]
a = sorted(list_a,key = lambda x : x[1])
print(a) #[[1, 2, 3], [1, 3, 5], [3, 4, 6]]
==============================================================
import random
l = [1, 2, "sree", 10, 3, "kanth", 4, 5, 6, 7]
x = random.sample(l, 1)
l.remove(x[0]) # x gives the list of number of sample values
print(x[0], " is removed from the list")
print(l)
"""--- using the pop
function"""
l = [1, 2, "sree", 10, 3, "kanth", 4, 5, 6, 7]
print(l.pop(l.index(random.sample(l, 1)[0])))
print(x,
l)
==============================================================
What will
be the output for the following code
def Narendra(x,*y,**z):
print(x)
print(*y)
print(**z)
Narendra(15, 2, 3, 4, 5, "Bhagyasree", x =11, y=12, z=13)
==============================================================
# Python program to check the validation of the password
password as a combination of alphanumeric characters along with special characters, and check whether the password is valid or not with the help of f bew conditions.
Primary
conditions for password validation :
1.
Minimum
8 characters.
2.
The
alphabet must be between [a - z]
3.
At
least one alphabet should be in Upper Case [A-Z]
4.
At
least 1 number or digit between [0-9].
5.
At
least 1 character from [ _ or @ or $ ].
# Module of a regular expression is used with
search()
import re
password = "R@m@_f0rtu9e$"
flag = 0
while True:
if (len(password) < 8):
flag = -1
break
elif not re.search("[a-z]", password):
flag = -1
break
elif not re.search("[A-Z]", password):
flag = -1
break
elif not re.search("[0-9]", password):
flag = -1
break
elif not re.search("[_@$]", password):
flag = -1
break
elif re.search("\s", password):
flag = -1
break
else:
flag = 0
print("Valid Password")
break
if flag == -1:
print("Not a Valid Password")
========================================================================
def get_packet_list(cmd):
'''
returns Packet List. Used by other Keywords internally
INPUT: `cmd`` :- Tshark command to be executed
OUTPUT: Returns Packets as List of Dictionaries on success
Usage: Packet_list=get_packet_list(cmd)
'''
print(cmd)
fh=os.popen(cmd)
data_dict=dict()
data_dict_list=[]
index=0
for eachLine in fh.readlines():
eachLine = eachLine[:-1]
if index == 0:
headers = eachLine.split('|')
else:
data_list = eachLine.split('|')
data_dict = dict(zip(headers, data_list))
data_dict_list.append(data_dict)
index +=1
return data_dict_list
def tx_packets_count_per_second_from_source(pcap_file_path,
source_ip_address):
cmd
= 'tshark -r {pcap_file_path} -E header=y -Y "(ip.src=={source_ip_address}
and udp)" -E separator="|" -T fields -e frame.number -e
frame.time_epoch'.format(pcap_file_path= pcap_file_path, source_ip_address=
source_ip_address)
print("Command
to be executed : {cmd} ".format(cmd=cmd))
response =
get_packet_list(cmd)
l =
[i['frame.time_epoch'].split(".")[0] for i in response]
dict_pkts =
{time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(float(i))):l.count(i) for i
in l}
df =
pd.DataFrame(data=dict_pkts, index=["Tx_Pkts_count"])
df = (df.T)
df.to_excel("Tx_packets.xlsx",sheet_name="UDP_Tx_packets",index_label="Seconds")
Calling function:
==============
if __name__ == '__main__':
pcap_file_path =
r"C:\Narendra\23feb2022\-pktcap-2022-01-11_13.54.27.pcap"
source_ip_address =
"192.168.xx.xxx"
tx_packets_count_per_second_from_source(pcap_file_path,
source_ip_address)
output:
======
In Excel sheet you will get the number of UDP packets
transmitted per second.
Example:
========
Seconds Tx_Pkts_count
2022-01-11 13:54:45 8
2022-01-11 13:54:46 2
2022-01-11 13:54:47 2
2022-01-11 13:54:48 2
2022-01-11 13:54:49 2
2022-01-11 13:54:50 2
2022-01-11 13:54:51 2
2022-01-11 13:54:52 2
2022-01-11 13:54:53 2
2022-01-11 13:54:54 2
2022-01-11 13:54:55 2
2022-01-11 13:54:56 33
2022-01-11 13:54:57 51
2022-01-11 13:54:58 53
2022-01-11 13:54:59 52
==============================================================
def terminate_thread(cmd_pipe,
timeout):
st_time
= time.time()
while
not teminate_flag():
if
(time.time() - st_time) > timeout:
try:
cmd_pipe.terminate()
except:
pass
break
def teminate_flag(value=-1):
global
terminate_flg
if
value < 0:
return
terminate_flg
else:
terminate_flg
= value
def run_adb_command(cmd, adb_timeout = 300):
"""
Runs
ADB command and returns its output as a list of lines
This method uses subprocess.Popen to run the command
It
waits for 300 secs for the command to get completed
Commands
like "adb shell" is not supported as this is blocked
until
user gives input. Do not use this method for adb commands which
gives
huge output data (for example 1 Kb of data)
:param
cmd: Command to be executed
:return:
list of lines
"""
output
= ''
error
= ''
log_message("ADB_CMD",
"{cmd}".format(cmd=cmd))
cmd_pipe
= subprocess.Popen(cmd, stdout=subprocess.PIPE,stderr=subprocess.PIPE)
st_time
= time.time()
teminate_flag(0)
thr
= threading.Thread(target=terminate_thread, args=(cmd_pipe, adb_timeout))
thr.start()
while
cmd_pipe.poll() is None:
output
+= cmd_pipe.stdout.readline()
if
(time.time() - st_time) > adb_timeout:
break
teminate_flag(1)
thr.join()
print
"Command run for {time:0.2f} secs".format(time = (time.time() -
st_time) )
try:
cmd_pipe.terminate()
except:
pass
(out,
err) = cmd_pipe.communicate()
output
+= out
error
+= err
if
error:
print("run_adb_command: Error
{error} while running command ".format(error=error)
return
re.split(b"\n+", output))
===========================================================
import os
import glob
os.chdir(r"path
of directory")
file =
glob.glob(".txt")
print(file)
=============================================================
Python Interview Questions on Files & Folders(directories)
file = open("Narendra.txt", "r")
print("Number of lines:", len(file.read().split("\n")))
### OR ###
print("Number of lines:", len(open("Narendra.txt", "r").readlines()))
=========================================================================
""" W.A.P to get only .txt/.json/.py/.xml/.xls files in the directory """
import os
def get_file_names_based_on_extension(path, extension):
for root, dirs, files in os.walk(path):
for file in files:
if file.endswith(extension):
print(file)
path = r"E:\Narendra_Training_Data\Automation_Training_Data\Narendra_python_Feb2021"
extension =".py"
get_file_names_based_on_extension(path,extension)
==============================================================
