Python - String Exercises

Example 1

Python program to find number of vowels in a given string.

mystr = "All animals are equal. Some are more equal"vowels = "aeiou"count=0for x in mystr:   if x.lower() in vowels: count+=1print ("Number of Vowels:", count)

It will produce the followingoutput −

Number of Vowels: 18

Example 2

Python program to convert a string with binary digits to integer.

mystr = '10101'def strtoint(mystr):   for x in mystr:      if x not in '01': return "Error. String with non-binary characters"   num = int(mystr, 2)   return numprint ("binary:{} integer: {}".format(mystr,strtoint(mystr)))

It will produce the followingoutput −

binary:10101 integer: 21

Changemystr to '10, 101'

binary:10,101 integer: Error. String with non-binary characters

Example 3

Python program to drop all digits from a string.

digits = [str(x) for x in range(10)]mystr = 'He12llo, Py00th55on!'chars = []for x in mystr:   if x not in digits:      chars.append(x)newstr = ''.join(chars)print (newstr)

It will produce the followingoutput −

Hello, Python!

Exercise Programs

• Python program to sort the characters in a string

• Python program to remove duplicate characters from a string

• Python program to list unique characters with their count in a string

• Python program to find number of words in a string

• Python program to remove all non-alphabetic characters from a string