Python strings

Python strings

• 2.
   Find lengthof string  Accessing individual characters/slicing  Difference between string and list.  Convert to lowercase / uppercase / titlecase / swapcase  Verify if the strings consists of alphabets/digits/upper/lower  Split string  Find substring
• 3.
   A stringis a sequence of characters.  We can create string by enclosing characters in quotes.  Python treats single quotes the same as double quotes.  Python uses Unicode format to represent characters.
• 4.
   Reading andPrinting a string
• 5.
   We canaccess individual characters of string using indexing.  If we try to access index out of the range or use decimal number, we will get errors.
• 6.
   Since thereis no separate “character” type, indexing a string produces strings of length 1
• 7.
   We canaccess substrings using slicing
• 8.
   Joining oftwo or more strings into a single one is called concatenation.  The + operator does this in Python.  The * operator can be used to repeat the string for a given number of times.
• 9.
   Using forloop we can iterate through a string.
• 11.
  str.isalnum() str.isalpha() str.isdigit() str.islower() str.isspace() str.isupper() str.istitle()
• 13.
   Write codeto check if the given password is strong or not.
• 14.
  str.lower() Convert allcharacters to lowercase str.upper() Convert all characters to uppercase str.swapcase() Convert uppercase to lowercase and vice versa str.title() First char of each word is changed to uppercase and others to lowercase str.capitalize() First char of the string is changed to uppercase others to lowercase
• 16.
   You aregiven a string and your task is to swap cases. In other words, convert all lowercase letters to uppercase letters and vice versa.
• 17.
   Count thenumber of vowels in a string.
• 18.
  str.count(sub) Return thenumber of non-overlapping occurrences of substring sub . str.find(sub) Return the lowest index in the string where substring sub is found. Return -1 if sub is not found. str.index(sub) Like find(), but raiseValueError when the substring is not found. str.split(sep = None) Return a list of the words in the string, using sep as the delimiter string. S.join(list) Return a string which is the concatenation of the strings in the list. The separator between elements is S.
• 20.
  Count number ofoverlapping substrings
• 22.
   Return alist of the words in String
• 23.
   Default separatoris any space(space,newline,tab)  To specify any other separator, specify it explicitly.
• 24.
   Used toefficiently construct strings from multiple fragments.  str.join(iterable)  Return a string which is the concatenation of the strings in iterable.  The separator between elements is the string providing this method.  A TypeError will be raised if there are any non-string values in iterable.
• 25.
   vowels =['a', 'e', 'i', 'o', 'u']  vowels  ['a', 'e', 'i', 'o', 'u']  s = "-".join(vowels)  s  'a-e-i-o-u'
• 26.
   nums =[12,23,21,43,56]  nums  [12, 23, 21, 43, 56]  s = "".join(nums)  TypeError: sequence item 0: expected str instance, int found  s = "".join(map(str , nums) )  s  '1223214356'
• 27.
   Replace method
• 29.
   An anagramis a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once.  Anagram Example: LISTEN SILENT BINARY BRAINY SCHOOL MASTER THE CLASSROOM CAR ARC
• 30.
   Given twostrings, verify if they are anagram
• 32.
   Pangram isa sentence containing every letter of the alphabet.  Given a sentence, determine whether it is pangram, ignore case.  Pangram Examples:  The quick brown fox jumps over the lazy dog  Two driven jocks help fax my big quiz.​  Pack my box with five dozen liquor jugs.  The five boxing wizards jump quickly.  Bright vixens jump; dozy fowl quack.
• 34.
   Write aprogram to verify if the given string has all unique characters
• 35.
   Write aprogram to remove all duplicate characters from a string.