String CheatSheet

Functions and Methods to be used in string data type

1. Concatenation(+) : It joins a string with another string. str1='hi I am' str2='ayush' result= str1 + str2 # str3='hi I am ayush'

2. Repitition( * ): It repeats a string. str='ayush' result= str * 3 # ayushayushayush

3. Membership Operator:

   1. in : It checks the presence of a substring in a string. str1='hi I am Ayush' result= 'I' in str1 # True

   2. not in: It checks the absence of a subtring in a string. str1='hi I am Ayush' result='z' in str1 # True

4. len(): It gives the length (number of characters) of the string. str1='hi i am Ayush' result= len(str1) # 13

5. max(): It gives the maximum value character in a string. str1='Ayush' result=max(str1) # y

6. min(): It gives the minimum value character in a string. str1='Ayush' result=min(str1) # A

7. .lower(): It converts all the characters of a string to Lower case. str1='AYUSH' result=str1.lower() # ayush

8. .upper(): It converts all the characters of a string to upper case. str1='ayush' result=str1.upper() # 'AYUSH'

9. .capitalize(): It capitalizes the first character of the string only. str1='HI I AM AYUSH' result=str1.capitalize() # Hi i am ayush

10. .title(): It capitalizes the first letter of each word in the string. str1='HI I AM AYUSH' result=str1.title() # Hi I Am Ayush

11. .swapcase(): It converts all lowercase characters to uppercase and all uppercase characters to lowercase within the string. str1=' Hi I aM aYUsh' result= str1.swapcase() # hI i Am AyuSH

12. .strip(): It removes all whitespaces from left and right side of the string. str1=' ayush ' result=str1.strip() # ayush

13. .lstrip(): It removes all whitespaces from left side of the string only. str1=' ayush ' result= str1.lstrip() # ayush (includes spaces present on the right side)

14. .rstrip():It removes all whitespaces from right side of the string only. str1=' ayush ' result=str1.rstrip() # ayush (includes spaces on the left side)

15. .replace(old,new): Replaces all occurrences of the "old" substring with the "new" substring. str1='python is python and python is good.' result=str1.replace('Python','java') # java is java and java is good. .replace(old,new,count): Replaces old substring with the new substring depending upon the counting provide. str1='python is python and python is good' result=str1.replace('python','java',2) # java is java and python is good.

16. .count('substring'): It gives the counting of a substring in the string. str1='python is python and python is good' result=str1.count('o') # 5 .count('substring',start,end): It gives the counting of a substring in the string. Counting starts from start index no. and ends at end index number. str1='python is python and python is good' result=str1.count('o',15,35) # 3

17. .find('substring'): It gives the index number of the first appearance of the substring. str1='python is python and python is good' result=str1.find('y') # 1 .find('substring',start,end): It gives the index number of the first appearance of the substring starting from start point. str1='python is python' result=str1.find('y',2,15) # 11

18. .rfind('substring'): It gives the index number of the first appearance of the substring from the right side. str1='python is python' result=str1.rfind('y') # 11

19. .index('substring'): It gives the index number of the first appearance of the substring. str1='python is python and python is good' result=str1.find('y') # 1 .index('substring',start,end): It gives the index number of the first appearance of the substring starting from start point. str1='python is python' result=str1.find('y',2,15) # 11

20. .rindex('substring'): It gives the index number of the first appearance of the substring from the right side. str1='python is python' result=str1.rfind('y') # 11

21. .split(separator): It breaks a string into multiple substrings depending upon the separator. Default separater is 'space'. str1='python is a programming language' result=str1.split() #['python','is','a','programming','language'] split(separator,maxsplit): It breaks a string into multiple substrings depending upon the separator. Default separater is 'space'.Maxsplit defines the number of breaks you want of a string. str1='python is a programming language' result=str1.split(' ',2) #['python','is','a programming language']

22. .rsplit(separator): It breaks a string into multiple substrings depending upon the separator. Default separater is 'space'. str1='python is a programming language' result=str1.rsplit() #['python','is','a','programming','language'] rsplit(separator,maxsplit): It breaks a string into multiple substrings depending upon the separator. Default separater is 'space'.Maxsplit defines the number of breaks you want of a string. str1='python is a programming language' result=str1.rsplit(' ',2) #['python is a','programming', 'language']

23. .partition(): It breaks a string depending upon the separater but only once and also includes the separator in the output. str1='python is a programming language' result=str1.partition(' ') # ('python',' ' ,'is a programming language') .rpartition(): It breaks a string depending upon the separater but only once and also includes the separator in the output. str1='python is a programming language' result=str1.rpartition(' ') # ('python is a programming',' ', 'language')

24. .islower(): It checks whether all the alphabets in a string are in lower case or not. str1='ayush' result=str1.islower() # True

25. .isupper(): It checks whether all the alphabets in a string are in upper case or not. str1='AYUSH' result=str1.isiupper() # True

26. .alpha(): It checks whether all the characters in a string are alphabet or not. str1='ayush' result=str1.alpha() # True

27. .isnumeric(): It checks whether all the characters in a string are digit or not. str1='12345' result=str1.isnumeric() # True

28. .isalnum(): It checks whether all the characters in a string are alphabet or digits only. str1='ayush12345' result=str1.isalnum # True

29. .startswith(): It checks whether the string starts with a particular substring or not. str1='[phone]' result=str1.startswith('+91') # True

30. .endswith(): It checks whether the string ends with a particular substring or not. str1='myfile.txt' result=str1.endswith('txt') # True