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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=0 for x in mystr: if x.lower() in vowels: count+=1 print ("Number of Vowels:", count)

It will produce the following output −

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 num print ("binary:{} integer: {}".format(mystr,strtoint(mystr)))

It will produce the following output −

binary:10101 integer: 21

Change mystr 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 following output −

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

 

 

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