Python By Code: July 2015

Friday, July 31, 2015

Python Program to Add digits of a given number

number=input("Enter a number :)
sum=0

while number > 0 :
rem=number % 10
sum =sum + rem
number=number /10

print sum

Wednesday, July 15, 2015

Program to remove duplicate elements from list

list=[1,2,3,4,5,1,2,3,4,5,99,99]
newlist=[]

j=0
def removeduplicate(list):
   for item in list:
       if item not in newlist:
           newlist.append(item)

removeduplicate(list)
print newlist

Friday, July 10, 2015

Program to create separate even and odd numbers from a list

num_list = [1,21,53,84,50,66,7,38,9]

  odd=[]
even=[]
for i in num_list:

if i%2==0:
    even.append(i)
else
    odd.append(i)

print odd
print even

Wednesday, July 8, 2015

Python program to Copy a line containing a word to other file

with open("test.txt") as f:
lines = f.readlines()
lines = [l for l in lines if "Python" in l]
with open("out.txt", "w") as f1:

f1.writelines(lines)

File handlign in python

Reading ,Writing to a file in Python

fo = open("test.txt","w")
str1="This is a Test file written from Python Program"
fo.write(str1)
fo.close()
fo = open("test.txt","r")
str=fo.read(100)
print str
fo.close

Print the sum of digits of numbers starting from 1 to 100 (inclusive of both)

print sum(range(1,101))

Create a new list that converts the following list of number strings to a list of numbers.
num_strings = ['1','21','53','84','50','66','7','38','9']

[int(i) for i in num_strings]
[1, 21, 53, 84, 50, 66, 7, 38, 9]

Iterate over a list of words and use a dictionary to keep track of the frequency(count) of each word.

s = ‘aaa bbb ccc ddd eee’
''.join(s.split())
Iterate over a list of words and use a dictionary to keep track of the frequency(count) of each word. for example
{‘one’:2, ‘two’:2, ‘three’:2}
Ans:
def dic(words):
a = {}
for i in words:
try:
a[i] += 1
except KeyError:
a[i] = 1
return a

Python program to check if the String is Palindrome

s = 'abc'
revs = s[::-1]
print s

if cmp(s,revs):
print "Palindrome"
else:
print "Not a Plaindrome"

Python Program to reverse a string without using built-in functions

def reverse(text):
     count=1
     mylist=[]
     for i in range(0,len(text)):
          mylist.append(text[len(text) - count])
          count=count +1
       return mylist

if__name__=="__main__":
      print reverse('parag')

Program to reverse a string in python

s = 'abc'
s = s[::-1]
print s

python program to compare two strings

a = raw_input('Please enter the first string to compare:')
b = raw_input('Please enter the second string to compare: ')

count = 0
if len(a) == len(b):
while count < len(a):
if a[count] != b[count]:
print ('Strings don\'t match! ')
break
else:
count = count + 1
else:
print "Strings are not of equal length"

Program Find length of String

strlen = 0
myString='This is a test string'
for c in myString:
strlen += 1

print strlen

Count number of letter occurence

Solution 1:

list1=[1,2,1,3]
count={}

for item in list1 :
 print item
 if item not in count: #check if item is in list
  count[item]=0 #if no then set item key value 
  print count[item]
 count[item]+=1 #yes increment  
 print count[item]
print count

Python: map of sequence



def cube(x): return x*x*x

res=map(cube, range(1, 11))

print res

#! python

# reduce(func, sequence)" returns a single value constructed by
# calling the binary function func on the first two items of the sequence, 
# then on the result and the next item, and so on

def add(x,y): return x+y

r=reduce(add, range(1, 11))
print r # 55

List comprehensions :

provide a concise way to create lists.

squares = []
for x in range(10):
squares.append(x**2)
squares
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

Delete element from list

a = [-1, 1, 66.25, 333, 333, 1234.5]
del a[0]

Using Lists as Queues





queue = ["Eric", "John", "Michael"]
queue.append("Terry")           # Terry arrives
queue.append("Graham")          # Graham arrives
print queue
s=queue.pop(0)
print s

s=queue.pop(0)
print s

print queue
[deleting elements from list]

a = [-1, 1, 66.6, 333, 333, 1234.5]
del a[0]
print a

del a[2:4]
print a

Program to Merge and Sort Elements of 2 different list

Python Program to Read an list and Search for an Element

list=[1,2,3,4,5]
print "Enter element to find"
num=raw_input("Enter number")

for item in list:
    if item == int(num):
        print "Element found"
        break
    else:
        print "Element not found"
        break

Program to Sort Names in an Alphabetical Order

Program to Split an Array from Specified Position & Add First Part to the End

Program to Delete the Specified Integer from an list

Program to Find the Second Largest & Smallest Elements in an list

python program to Sort a list in ascending order

with inbuilt functions :

list1=[1,2,3]
list1.sort()

without inbuilt functions :

def sortlist(list):
    for i in range(len(list)):
        for j in range(len(list) - 1):
            if list[j] < list[j+1]:
                t=list[j]
                list[j]=list[j+1]
                list[j+1]=t


list1=[2,12,1,21,2,12,1,2]
sortlist(list1)
print list1

Program to Sort the List in an Ascending list

with inbuilt functions :

list1=[1,2,3]
list1.sort()

without inbuilt functions :

def sortlist(list):
    for i in range(len(list)):
        for j in range(len(list) - 1):
            if list[j] > list[j+1]:
                t=list[j]
                list[j]=list[j+1]
                list[j+1]=t


list1=[2,12,1,21,2,12,1,2]
sortlist(list1)
print list1