String Concept in Python, String Tutorials in Python, String important interview question on Python

The string is a collection of char, it will arrange multiple char using sequence. The string char index will be to start from 0 to length-1.

The string will be declared using  ' ',  " "  and  """
a= 'welcome'   #single line string
a= "welcome" #single line
a= """ welcome in scs """   #multiple line with proper syntax format

WAP to count total vowel and consonant in String?
s= 'welcome'    #['w','e','l','c','o','m','e']
c=0
d=0
for i in range(0,len(s)):
    if s[i]=='a' or s[i]=='e' or s[i]=='i' or s[i]=='o' or s[i]=='u':
        c=c+1
    else:
        d=d+1
print("vowel",c,"consonant",d)     

Another 

another way to create this program:-

s = input("Enter word")

v=0

c=0

for i in range(0,len(s)):

    if s[i] in ('a','e','i','o','u'):

        v=v+1

    else:

        c=c+1

print("Total vowel is ",v, "Consonent is ",c)        

another way to create this program:-

s = input("Enter word")

v=0

c=0

for ch in s:

    if ch in ('a','e','i','o','u'):

        v=v+1

    else:

        c=c+1

print("Total vowel is ",v, "Consonent is ",c)  

......................................................................

MOST OF THE STRING PROGRAM WILL BE RELATED TO ASCII CODE HENCE PYTHON PROVIDE TWO DIFFERENT METHOD TO PERFORM OPERATION FROM
ASCII TO CHAR AND CHAR TO ASCII
1)  ord():-   this function is used to return the ascii code of particuar char

                  print(ord('a'))  #97   #char to ascii'

2)  chr():-  this function is used to return jhar from ascii code 

                    print(chr(65))   #A    #ascii to char

WAP to find max char in String?
s= 'ramesh'
m = s[0]
for i in range(1,len(s)):
   if m<s[i]:   #s<h
       m=s[i]
print(m) 
ASSIGNMENT:-

1)WAP to reverse string where vowel will be in the same position?
for example  Ramesh          hasemr
Solution:-

s="ramesh"

s1=""

s1 += s[5]

s1 += s[1]

s1 += s[4]

s1 += s[3]

s1 += s[2]

s1 += s[0]

print(s1)

2) WAP to check palindrome in String?
example  madam, naman
Solution
s="madam"
c = len(s)-1
flag=True
for i in range(0,len(s)//2):
    if s[i]!=s[c-i]:
        flag=False
        break
 if flag:
    print("pallindrom")
else:
    print("np")

Another way to check the program of a palindrome:-

s = "gggggg"

for i in range(0,len(s)//2):

    if s[i]!= s[(len(s)-1-i)]:

        print("Not Pallindrom")

        break

else:

    print("Pallindrom")

3) WAP to convert a string from upper case to lower case and lower case to upper case?

Solution:-
s="MADAM"
s1=""
for i in range(0,len(s)):
   s1+=chr(ord(s[i])+32)
print(s1)
Program to convert String in Opposite case?

s = "Hello"

s1 = ""

for d in s:

    if ord(d)>=65 and ord(d)<=91:

      s1 = s1 + chr(ord(d)+32)

    else:

      s1 = s1 + chr(ord(d)-32)

print(s1)   

4) WAP to replace the string char from the next consecutive String char  (if char will be z then replace by a)?

   Manish  o.p  nbojti 
5) WAP to extract numeric, alphabets, and special char in separate string in any String?

s = "abcd123@7$f"

abcdf

123

@$

6)  WAP to display a number of repeated char in String?

hello     h 1 e 1 l 2 o 1

Solution of this program:-

s = "mangalam"

for i in range(0,len(s)):

    c=0

        for k in range(0,i):

        if s[i]==s[k]:

            break

    else:    

     for j in range(i,len(s)):

        if s[i]==s[j]:

            c=c+1

     else:

        print(s[i],c)

7)  WAP to validate emaild?  (@, ., the position of @ should be lesser of last dot position)

8)  WAP to display a strength of password that password is weak, medium, and Strong according to predefined cases?

Strong (at least 3 special char, non-consecutive, not belonging with first name and Lastname, one upper case char and numeric is mandatory, length minimum 6)

Medium (at least 2 special char, non-consecutive, length minimum 6)