Date Conversion from One Format To Another Python

Following Code will convert date entered in one format to another:

Code::

def converter(date):
    day,month,year=date.split('/')
    monthnames=['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec']
    return monthnames[int(month)-1]+" "+day+","+year

date=input("Enter Date in DD/MM/YYYY format : ")
print ("Entered Date: "+converter(date))

Output::

Palindrome Testing Recursively Python

Entered string is Palindrome or not can be tested using Recursion as Shown by Following Code::

Code::

def isletter(c):     #function to check that character c is a letter or not

    return ('a'<=c<='z')or ('A'<=c<='Z')

def paltest(line):

    if len(line)<=1:return True

    elif not isletter(line[0]):return paltest(line[1:])      #ignoring first not letter

    elif not isletter(line[-1]):return paltest(line[:-1])    #ignoring last not letter

    elif line[0].lower()!=line[-1].lower():return False      

    else:return paltest(line[1:len(line)-1])                 #palindrome testing recursive call

string=input("Enter any String: ")

if(paltest(string)) : print("Yes,Palindrome")

else: print("Not,Palindrome")

Output::

Case Conversion Python

Following Code Will Convert The Case of Entered String 
i.e lower to UPPER and UPPER to lower



Code::

def conversion(l):
    li=list(l)
    for i in range(0,len(l)):
        if 'a'<=li[i]<='z': li[i]=chr(ord(li[i])-32)
        elif 'A'<=li[i]<='Z': li[i]=chr(ord(li[i])+32)
    stri=''
    return stri.join(li)

s=input("Enter String: ")
print(conversion(s))


Output::

Standard Deviation Calculator Python

The Standard Deviation is a measure of how spread out numbers are.

Standard Deviation is a quantity expressing by how much the members of a group differ from the mean value for the group.

Its symbol is σ (the greek letter sigma)

Following Code will calculate the Standard Deviation:

Code::

import math
def average(l):             #function to calculate average(mean)
    total=0.0
    for i in l:
        total=total+int(i)
    if(len(l)==0): return 0
    else: return(total/len(l))
    
def standardeviation(l,ave):       #function to calculate standard deviation
    diff=0.0
    for i in l:
        x=int(i)-ave
        diff=diff+x*x
    if(len(l)==0): return 0
    else :return(math.sqrt(diff/len(l)))    


lst=[]
num=input("Enter Values ,enter -1 to end:")
while num!='-1':
    lst.append(num)
    num=input()
ave=average(lst)
print("Average is:",ave)
sd=standardeviation(lst, ave)
print("Standard Deviation :",sd)
        
Output::

Lower Function User Defined Python

Following code will define a lower function to convert all letters of a string to lower case:

Code::

def lower(a):
    x=""
    for i in a:
        if(i>='A' and i<'a'):
            x=x+((chr((ord(i)+32))))     #ord to convert character to ascii value
        else:
            x=x+i
    return x

i=input("Enter any String :")
print(lower(i))

Output::

User Defined String Upper Function Python

Following code defines a function upper which changes the entered string to Upper Case:

Code::

def upper(a):
    x=""                                                 #for returning Upper Case
    for i in a:
        if(i>='a'):                                     #for Not Changing Already upper Case Letters
            x=x+((chr((ord(i)-32))))
        else:
            x=x+i
    return x

i=input("Enter any String :")
print(upper(i))

Output::

Number To String Python

Following Code will convert a number entered by user to the Same Number in Words

Code::

def numtostring(n):
    if (n==0):return ""
    elif(n==1):return "one"
    elif(n==2):return "two"
    elif(n==3):return "three"
    elif(n==4):return "four"
    elif(n==5):return "five"
    elif(n==6):return "six"
    elif(n==7):return "seven"
    elif(n==8):return "eight"
    elif(n==9):return "nine"
    elif(n==10):return "ten"
    elif(n==11):return "eleven"
    elif(n==12):return "twelve"
    elif(n==13):return "thirteen"
    elif(n==14):return "fourteen"
    elif(n==15):return "fifteen"
    elif(n==16):return "sixteen"
    elif(n==17):return "seventeen"
    elif(n==18):return "eighteen"
    elif(n==19):return "nineteen"
    elif(n<=29):return "twenty "+numtostring(n%10)
    elif(n<=39):return "thirty "+numtostring(n%10)
    elif(n<=49):return "forty "+numtostring(n%10)
    elif(n<=59):return "fifty "+numtostring(n%10)
    elif(n<=69):return "sixty "+numtostring(n%10)
    elif(n<=79):return "seventy "+numtostring(n%10)
    elif(n<=89):return "eighty "+numtostring(n%10)
    elif(n<=99):return "ninety "+numtostring(n%10)

def convert(n):
    if(n<=99):
        return numtostring(n)
    elif(n<=999):
        return numtostring(n//100)+' hundred '+numtostring(n%100)
    elif(n<=9999):
        return numtostring(n//1000)+' thousand '+numtostring((n//100)%10)+' hundred '+numtostring((n%100))


i=int(input("Enter Any Number Upto 9999: "))
print(convert(i))
     
Output: